LFG

2025-09-11 18:59:15 +03:00
commit 5440884b85
20 changed files with 3074 additions and 0 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,170 @@
+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  GO_VERSION: 1.19
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: ${{ env.GO_VERSION }}
+        cache: true
+        
+    - name: Download dependencies
+      run: make deps
+      
+    - name: Run linter
+      uses: golangci/golangci-lint-action@v3
+      with:
+        version: latest
+        args: --timeout=5m
+        
+    - name: Run tests
+      run: make test
+      
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./coverage.out
+        flags: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: false
+
+  build:
+    name: Build Application
+    runs-on: ubuntu-latest
+    needs: test
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: ${{ env.GO_VERSION }}
+        cache: true
+        
+    - name: Download dependencies
+      run: make deps
+      
+    - name: Build application
+      run: make build
+      
+    - name: Upload build artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: gorz-binary
+        path: gorz
+
+  docker-build:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref == 'refs/heads/main' || github.ref == 'refs/heads/develop'
+    
+    permissions:
+      contents: read
+      packages: write
+      
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+      
+    - name: Log in to the Container registry
+      uses: docker/login-action@v2
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+        
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v4
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=sha,prefix={{branch}}-
+          type=raw,value=latest,enable={{is_default_branch}}
+          
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        platforms: linux/amd64,linux/arm64
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+
+  security-scan:
+    name: Security Scan
+    runs-on: ubuntu-latest
+    needs: build
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      
+    - name: Run Trivy vulnerability scanner
+      uses: aquasecurity/trivy-action@master
+      with:
+        scan-type: 'fs'
+        scan-ref: '.'
+        format: 'sarif'
+        output: 'trivy-results.sarif'
+        
+    - name: Upload Trivy scan results to GitHub Security tab
+      uses: github/codeql-action/upload-sarif@v2
+      with:
+        sarif_file: 'trivy-results.sarif'
+
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    needs: [test, build, docker-build, security-scan]
+    if: github.ref == 'refs/heads/main' && startsWith(github.ref, 'refs/tags/v')
+    
+    permissions:
+      contents: write
+      
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        
+    - name: Download build artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: gorz-binary
+        
+    - name: Create Release
+      uses: softprops/action-gh-release@v1
+      with:
+        files: gorz
+        generate_release_notes: true
+        draft: false
+        prerelease: false
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,48 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+gorz
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool
+*.out
+coverage.html
+
+# Go workspace files
+go.work
+
+# Dependency directories
+vendor/
+
+# IDE specific files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Configuration files with sensitive data
+config.yaml
+*.key
+*.pem
+*.crt
+
+# Log files
+*.log
+
+# Docker compose override files
+docker-compose.override.yml
--- a/54
+++ b/54
@@ -0,0 +1,54 @@
+# Build stage
+FROM golang:1.19-alpine AS builder
+
+# Install git and certificates
+RUN apk add --no-cache git ca-certificates
+
+# Set working directory
+WORKDIR /app
+
+# Copy go mod files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-extldflags "-static"' -o /gorz ./cmd/server
+
+# Final stage
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS
+RUN apk --no-cache add ca-certificates
+
+# Create non-root user
+RUN addgroup -g 1000 appgroup && adduser -u 1000 -G appgroup -s /bin/sh -D appuser
+
+# Set working directory
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /gorz .
+
+# Copy config file if it exists
+COPY config.yaml .
+
+# Change ownership
+RUN chown -R appuser:appgroup /app
+
+# Switch to non-root user
+USER appuser
+
+# Expose ports
+EXPOSE 8080 9090
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# Run the application
+CMD ["./gorz"]
--- a/21
+++ b/21
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 iwasforcedtobehere
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/81
+++ b/81
@@ -0,0 +1,81 @@
+.PHONY: build run test clean deps fmt vet lint docker-build docker-run docker-clean help
+
+# Variables
+BINARY_NAME=gorz
+VERSION=$(shell git describe --tags --always --dirty --match="v*")
+BUILD_TIME=$(shell date -u '+%Y-%m-%d %H:%M:%S')
+GIT_COMMIT=$(shell git rev-parse --short HEAD)
+LDFLAGS=-ldflags "-X main.Version=${VERSION} -X main.BuildTime='${BUILD_TIME}' -X main.GitCommit=${GIT_COMMIT}"
+
+# Default target
+all: deps fmt vet lint build
+
+# Build the binary
+build:
+	go build ${LDFLAGS} -o ${BINARY_NAME} ./cmd/server
+
+# Run the binary
+run: build
+	./${BINARY_NAME}
+
+# Run tests
+test:
+	go test -v -race -coverprofile=coverage.out ./...
+	go tool cover -html=coverage.out -o coverage.html
+
+# Clean build artifacts
+clean:
+	go clean
+	rm -f ${BINARY_NAME}
+	rm -f coverage.out coverage.html
+
+# Download dependencies
+deps:
+	go mod download
+	go mod tidy
+
+# Format code
+fmt:
+	go fmt ./...
+
+# Vet checks for errors
+vet:
+	go vet ./...
+
+# Run linter
+lint:
+	golangci-lint run
+
+# Build Docker image
+docker-build:
+	docker build -t ${BINARY_NAME}:${VERSION} .
+
+# Run Docker container
+docker-run: docker-build
+	docker run -p 8080:8080 -p 9090:9090 -v $(PWD)/config.yaml:/app/config.yaml ${BINARY_NAME}:${VERSION}
+
+# Clean Docker images
+docker-clean:
+	docker rmi ${BINARY_NAME}:${VERSION} || true
+
+# Generate default config
+config:
+	go run ./cmd/server -config=config.yaml && echo "Default configuration created at config.yaml"
+
+# Show help
+help:
+	@echo "Available targets:"
+	@echo "  all         - Run deps, fmt, vet, lint, and build"
+	@echo "  build       - Build the binary"
+	@echo "  run         - Build and run the binary"
+	@echo "  test        - Run tests and generate coverage report"
+	@echo "  clean       - Clean build artifacts"
+	@echo "  deps        - Download dependencies"
+	@echo "  fmt         - Format code"
+	@echo "  vet         - Run go vet"
+	@echo "  lint        - Run linter"
+	@echo "  docker-build - Build Docker image"
+	@echo "  docker-run  - Build and run Docker container"
+	@echo "  docker-clean - Clean Docker images"
+	@echo "  config      - Generate default configuration"
+	@echo "  help        - Show this help message"
--- a/README.md
+++ b/README.md
@@ -0,0 +1,179 @@
+# goRZ - Fast Reverse Proxy Server
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/iwasforcedtobehere/goRZ)](https://goreportcard.com/report/github.com/iwasforcedtobehere/goRZ)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+[![Release](https://img.shields.io/github/v/release/iwasforcedtobehere/goRZ)](https://github.com/iwasforcedtobehere/goRZ/releases)
+
+goRZ is a blazingly fast reverse proxy server designed for local development with NAT/firewall traversal capabilities. It's the perfect tool for developers who enjoy watching their requests bounce around like a confused pinball before reaching their destination.
+
+## Features
+
+- ⚡ **High Performance**: Built with Go, because who has time to wait for slow proxies?
+- 🔄 **Multiple Load Balancing Strategies**: Round Robin, Least Connections, and Random (for when you're feeling adventurous)
+- 🩺 **Health Checking**: Monitors your targets like an overprotective parent
+- 🔍 **Monitoring**: Built-in metrics endpoint because numbers make us feel smart
+- 🌐 **NAT/Firewall Traversal**: Punches through NATs and firewalls like they're made of paper
+- 🐳 **Docker Support**: Containerized for your convenience (and our sanity)
+- ⚙️ **Flexible Configuration**: YAML configuration that's almost as flexible as a yoga instructor
+
+## Installation
+
+### From Source
+
+```bash
+git clone https://github.com/iwasforcedtobehere/goRZ.git
+cd goRZ
+make build
+```
+
+### Using Docker
+
+```bash
+docker pull ghcr.io/iwasforcedtobehere/gorz:latest
+```
+
+## Quick Start
+
+1. Create a configuration file:
+
+```bash
+make config
+```
+
+2. Edit the generated `config.yaml` to match your needs (or just use the defaults, we won't judge)
+
+3. Run the server:
+
+```bash
+make run
+```
+
+4. Marvel at your requests being proxied with the speed of a caffeinated cheetah
+
+## Configuration
+
+goRZ uses a YAML configuration file that's so intuitive, you'll think you've been using it for years (even if it's your first time):
+
+```yaml
+server:
+  port: 8080
+  read_timeout: 30
+  write_timeout: 30
+  idle_timeout: 60
+
+proxy:
+  targets:
+    - name: "my-awesome-app"
+      address: "http://localhost:3000"
+      protocol: "http"
+      weight: 1
+  load_balancer: "roundrobin"
+  health_check_path: "/health"
+  health_check_interval: 30
+
+nat:
+  enabled: false
+  stun_server: "stun:stun.l.google.com:19302"
+
+logging:
+  level: "info"
+  format: "json"
+  output: "stdout"
+
+monitor:
+  enabled: true
+  port: 9090
+  path: "/metrics"
+  auth: false
+```
+
+## Load Balancing
+
+goRZ supports multiple load balancing strategies because we believe in giving you choices (even if you'll probably just stick with round-robin):
+
+### Round Robin
+The classic "take turns" approach. Fair, predictable, and about as exciting as a beige wall.
+
+### Least Connections
+For when you want to distribute load based on which server is least busy. It's like being a traffic controller, but with less stress and more coffee.
+
+### Random
+For when you're feeling lucky or just enjoy chaos. It's surprisingly effective, which says something about the universe.
+
+## NAT/Firewall Traversal
+
+goRZ can help you traverse NATs and firewalls using STUN and TURN protocols. It's like having a secret tunnel that bypasses all those annoying network restrictions:
+
+```yaml
+nat:
+  enabled: true
+  stun_server: "stun:stun.l.google.com:19302"
+  turn_server: "turn:your-turn-server:3478"
+  turn_username: "your-username"
+  turn_password: "your-password"
+```
+
+## Monitoring
+
+goRZ includes a built-in monitoring endpoint that provides metrics about the proxy's performance. It's like having a fitness tracker for your proxy:
+
+```bash
+curl http://localhost:9090/metrics
+```
+
+You'll get a beautiful JSON response with all sorts of numbers and statistics that you can pretend to understand while nodding thoughtfully.
+
+## Development
+
+### Prerequisites
+
+- Go 1.19 or later
+- Make (for the Makefile targets)
+- Docker (optional, for containerized development)
+
+### Building
+
+```bash
+make build
+```
+
+### Testing
+
+```bash
+make test
+```
+
+### Linting
+
+```bash
+make lint
+```
+
+## Contributing
+
+Contributions are welcome! If you'd like to contribute, please:
+
+1. Fork the repository
+2. Create a feature branch (`git checkout -b feature/amazing-feature`)
+3. Commit your changes (`git commit -m 'Add some amazing feature'`)
+4. Push to the branch (`git push origin feature/amazing-feature`)
+5. Open a Pull Request
+
+We'll review your contribution with the enthusiasm of someone who just discovered coffee.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details. It's so permissive, you could probably use it to power a small country if you wanted to.
+
+## Acknowledgments
+
+- The Go team for creating a language that makes us feel productive
+- The authors of all the libraries we're using (you're the real MVPs)
+- Coffee, for fueling the development of this project
+- Our users, for being brave enough to trust a proxy with a name that sounds like a monster from a 1950s B-movie
+
+## Disclaimer
+
+This software is provided "as is", without warranty of any kind, express or implied. In no event shall the authors be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
+
+Basically, if it breaks, you get to keep both pieces. We're programmers, not lawyers.
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -0,0 +1,89 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+	"github.com/iwasforcedtobehere/goRZ/internal/logger"
+	"github.com/iwasforcedtobehere/goRZ/internal/proxy"
+)
+
+var (
+	configPath = flag.String("config", "config.yaml", "Path to configuration file")
+	version    = flag.Bool("version", false, "Show version information")
+)
+
+// Version information set at build time
+var (
+	Version   = "dev"
+	BuildTime = "unknown"
+	GitCommit = "unknown"
+)
+
+func main() {
+	flag.Parse()
+
+	if *version {
+		fmt.Printf("goRZ %s\n", Version)
+		fmt.Printf("Build time: %s\n", BuildTime)
+		fmt.Printf("Git commit: %s\n", GitCommit)
+		os.Exit(0)
+	}
+
+	// Initialize logger
+	appLogger := logger.NewLogger()
+	appLogger.Info("Starting goRZ reverse proxy server")
+
+	// Load configuration
+	cfg, err := config.Load(*configPath)
+	if err != nil {
+		appLogger.Fatal("Failed to load configuration", logger.Error(err))
+	}
+
+	// Create proxy server
+	proxyServer, err := proxy.NewServer(cfg, appLogger)
+	if err != nil {
+		appLogger.Fatal("Failed to create proxy server", logger.Error(err))
+	}
+
+	// Create HTTP server
+	server := &http.Server{
+		Addr:         fmt.Sprintf(":%d", cfg.Server.Port),
+		Handler:      proxyServer,
+		ReadTimeout:  time.Duration(cfg.Server.ReadTimeout) * time.Second,
+		WriteTimeout: time.Duration(cfg.Server.WriteTimeout) * time.Second,
+		IdleTimeout:  time.Duration(cfg.Server.IdleTimeout) * time.Second,
+	}
+
+	// Start server in a goroutine
+	go func() {
+		appLogger.Info("Server starting", logger.String("address", server.Addr))
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			appLogger.Fatal("Server failed", logger.Error(err))
+		}
+	}()
+
+	// Wait for interrupt signal
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+	<-quit
+	appLogger.Info("Shutting down server...")
+
+	// Graceful shutdown with timeout
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	if err := server.Shutdown(ctx); err != nil {
+		appLogger.Error("Server forced to shutdown", logger.Error(err))
+	}
+
+	appLogger.Info("Server exited")
+}
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -0,0 +1,89 @@
+version: '3.8'
+
+services:
+  gorz:
+    build: .
+    ports:
+      - "8080:8080"
+      - "9090:9090"
+    volumes:
+      - ./examples/config.yaml:/app/config.yaml
+    environment:
+      - GORZ_CONFIG=/app/config.yaml
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    networks:
+      - gorz-network
+
+  # Example web application to proxy to
+  webapp:
+    image: nginxdemos/hello:plain-text
+    ports:
+      - "3000:80"
+    networks:
+      - gorz-network
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:80"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+  # Another example application
+  api:
+    image: nginxdemos/hello:plain-text
+    ports:
+      - "3001:80"
+    networks:
+      - gorz-network
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:80"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+  # Prometheus for metrics collection
+  prometheus:
+    image: prom/prometheus:latest
+    ports:
+      - "9091:9090"
+    volumes:
+      - ./examples/prometheus.yml:/etc/prometheus/prometheus.yml
+      - prometheus-data:/prometheus
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--web.console.libraries=/etc/prometheus/console_libraries'
+      - '--web.console.templates=/etc/prometheus/consoles'
+      - '--storage.tsdb.retention.time=200h'
+      - '--web.enable-lifecycle'
+    networks:
+      - gorz-network
+    restart: unless-stopped
+
+  # Grafana for metrics visualization
+  grafana:
+    image: grafana/grafana:latest
+    ports:
+      - "3000:3000"
+    volumes:
+      - grafana-data:/var/lib/grafana
+    environment:
+      - GF_SECURITY_ADMIN_PASSWORD=admin
+    networks:
+      - gorz-network
+    restart: unless-stopped
+
+networks:
+  gorz-network:
+    driver: bridge
+
+volumes:
+  prometheus-data:
+  grafana-data:
--- a/examples/prometheus.yml
+++ b/examples/prometheus.yml
@@ -0,0 +1,30 @@
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+scrape_configs:
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+
+  - job_name: 'gorz'
+    static_configs:
+      - targets: ['gorz:9090']
+    metrics_path: '/metrics'
+    scrape_interval: 5s
+
+  - job_name: 'webapp'
+    static_configs:
+      - targets: ['webapp:80']
+    metrics_path: '/metrics'
+    scrape_interval: 5s
+
+  - job_name: 'api'
+    static_configs:
+      - targets: ['api:80']
+    metrics_path: '/metrics'
+    scrape_interval: 5s
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,21 @@
+module github.com/iwasforcedtobehere/goRZ
+
+go 1.19
+
+require (
+	github.com/pion/stun v1.0.0
+	github.com/pion/turn/v2 v2.0.10
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/pion/logging v0.2.2 // indirect
+	github.com/pion/mdns v0.0.5 // indirect
+	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/transport v0.13.1 // indirect
+	github.com/pion/udp v0.1.1 // indirect
+	golang.org/x/crypto v0.0.0-20220321153916-1c453e9389ed // indirect
+	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
+	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+	golang.org/x/text v0.3.7 // indirect
+)
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -0,0 +1,206 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Config represents the application configuration
+type Config struct {
+	Server   ServerConfig   `yaml:"server"`
+	Proxy    ProxyConfig    `yaml:"proxy"`
+	NAT      NATConfig      `yaml:"nat"`
+	Logging  LoggingConfig  `yaml:"logging"`
+	Monitor  MonitorConfig  `yaml:"monitor"`
+}
+
+// ServerConfig represents server configuration
+type ServerConfig struct {
+	Port         int    `yaml:"port"`
+	ReadTimeout  int    `yaml:"read_timeout"`
+	WriteTimeout int    `yaml:"write_timeout"`
+	IdleTimeout  int    `yaml:"idle_timeout"`
+	TLSCertFile  string `yaml:"tls_cert_file,omitempty"`
+	TLSKeyFile   string `yaml:"tls_key_file,omitempty"`
+}
+
+// ProxyConfig represents reverse proxy configuration
+type ProxyConfig struct {
+	Targets            []TargetConfig `yaml:"targets"`
+	LoadBalancer       string         `yaml:"load_balancer"` // "roundrobin", "leastconn", "random"
+	HealthCheckPath    string         `yaml:"health_check_path"`
+	HealthCheckInterval int           `yaml:"health_check_interval"`
+}
+
+// TargetConfig represents a proxy target
+type TargetConfig struct {
+	Name     string `yaml:"name"`
+	Address  string `yaml:"address"`
+	Protocol string `yaml:"protocol"` // "http", "https"
+	Weight   int    `yaml:"weight"`   // for weighted load balancing
+	Healthy  bool   `yaml:"-"`        // health status
+}
+
+// NATConfig represents NAT traversal configuration
+type NATConfig struct {
+	Enabled      bool   `yaml:"enabled"`
+	STUNServer   string `yaml:"stun_server,omitempty"`
+	TURNServer   string `yaml:"turn_server,omitempty"`
+	TURNUsername string `yaml:"turn_username,omitempty"`
+	TURNPassword string `yaml:"turn_password,omitempty"`
+}
+
+// LoggingConfig represents logging configuration
+type LoggingConfig struct {
+	Level  string `yaml:"level"`  // "debug", "info", "warn", "error"
+	Format string `yaml:"format"` // "json", "text"
+	Output string `yaml:"output"` // "stdout", "file"
+	File   string `yaml:"file,omitempty"`
+}
+
+// MonitorConfig represents monitoring configuration
+type MonitorConfig struct {
+	Enabled    bool   `yaml:"enabled"`
+	Port       int    `yaml:"port"`
+	Path       string `yaml:"path"`
+	Auth       bool   `yaml:"auth"`
+	Username   string `yaml:"username,omitempty"`
+	Password   string `yaml:"password,omitempty"`
+}
+
+// Load loads configuration from file
+func Load(path string) (*Config, error) {
+	// Check if file exists
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil, fmt.Errorf("configuration file not found: %s", path)
+	}
+
+	// Read file
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read configuration file: %w", err)
+	}
+
+	// Parse YAML
+	var config Config
+	if err := yaml.Unmarshal(data, &config); err != nil {
+		return nil, fmt.Errorf("failed to parse configuration: %w", err)
+	}
+
+	// Set defaults
+	setDefaults(&config)
+
+	return &config, nil
+}
+
+// setDefaults sets default values for configuration
+func setDefaults(c *Config) {
+	// Server defaults
+	if c.Server.Port == 0 {
+		c.Server.Port = 8080
+	}
+	if c.Server.ReadTimeout == 0 {
+		c.Server.ReadTimeout = 30
+	}
+	if c.Server.WriteTimeout == 0 {
+		c.Server.WriteTimeout = 30
+	}
+	if c.Server.IdleTimeout == 0 {
+		c.Server.IdleTimeout = 60
+	}
+
+	// Proxy defaults
+	if c.Proxy.LoadBalancer == "" {
+		c.Proxy.LoadBalancer = "roundrobin"
+	}
+	if c.Proxy.HealthCheckPath == "" {
+		c.Proxy.HealthCheckPath = "/health"
+	}
+	if c.Proxy.HealthCheckInterval == 0 {
+		c.Proxy.HealthCheckInterval = 30
+	}
+
+	// NAT defaults
+	if c.NAT.Enabled && c.NAT.STUNServer == "" {
+		c.NAT.STUNServer = "stun:stun.l.google.com:19302"
+	}
+
+	// Logging defaults
+	if c.Logging.Level == "" {
+		c.Logging.Level = "info"
+	}
+	if c.Logging.Format == "" {
+		c.Logging.Format = "json"
+	}
+	if c.Logging.Output == "" {
+		c.Logging.Output = "stdout"
+	}
+
+	// Monitor defaults
+	if c.Monitor.Enabled && c.Monitor.Port == 0 {
+		c.Monitor.Port = 9090
+	}
+	if c.Monitor.Enabled && c.Monitor.Path == "" {
+		c.Monitor.Path = "/metrics"
+	}
+}
+
+// CreateDefaultConfig creates a default configuration file
+func CreateDefaultConfig(path string) error {
+	config := Config{
+		Server: ServerConfig{
+			Port:         8080,
+			ReadTimeout:  30,
+			WriteTimeout: 30,
+			IdleTimeout:  60,
+		},
+		Proxy: ProxyConfig{
+			LoadBalancer:       "roundrobin",
+			HealthCheckPath:    "/health",
+			HealthCheckInterval: 30,
+			Targets: []TargetConfig{
+				{
+					Name:     "example",
+					Address:  "http://localhost:3000",
+					Protocol: "http",
+					Weight:   1,
+				},
+			},
+		},
+		NAT: NATConfig{
+			Enabled:    false,
+			STUNServer: "stun:stun.l.google.com:19302",
+		},
+		Logging: LoggingConfig{
+			Level:  "info",
+			Format: "json",
+			Output: "stdout",
+		},
+		Monitor: MonitorConfig{
+			Enabled: true,
+			Port:    9090,
+			Path:    "/metrics",
+			Auth:    false,
+		},
+	}
+
+	data, err := yaml.Marshal(config)
+	if err != nil {
+		return fmt.Errorf("failed to marshal default configuration: %w", err)
+	}
+
+	// Create directory if it doesn't exist
+	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
+		return fmt.Errorf("failed to create configuration directory: %w", err)
+	}
+
+	// Write configuration file
+	if err := os.WriteFile(path, data, 0644); err != nil {
+		return fmt.Errorf("failed to write configuration file: %w", err)
+	}
+
+	return nil
+}
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -0,0 +1,243 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestLoad(t *testing.T) {
+	// Create a temporary directory for test files
+	tempDir := t.TempDir()
+	configPath := filepath.Join(tempDir, "test-config.yaml")
+
+	// Create a test configuration file
+	testConfig := `server:
+  port: 9090
+  read_timeout: 60
+  write_timeout: 60
+  idle_timeout: 120
+
+proxy:
+  targets:
+    - name: "test-target"
+      address: "http://localhost:8080"
+      protocol: "http"
+      weight: 1
+  load_balancer: "leastconn"
+  health_check_path: "/healthz"
+  health_check_interval: 60
+
+nat:
+  enabled: true
+  stun_server: "stun:stun.example.com:3478"
+  turn_server: "turn:turn.example.com:3478"
+  turn_username: "testuser"
+  turn_password: "testpass"
+
+logging:
+  level: "debug"
+  format: "text"
+  output: "file"
+  file: "/var/log/gorz.log"
+
+monitor:
+  enabled: true
+  port: 8081
+  path: "/stats"
+  auth: true
+  username: "admin"
+  password: "secret"
+`
+
+	err := os.WriteFile(configPath, []byte(testConfig), 0644)
+	if err != nil {
+		t.Fatalf("Failed to write test config file: %v", err)
+	}
+
+	// Test loading the configuration
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Failed to load configuration: %v", err)
+	}
+
+	// Verify server configuration
+	if cfg.Server.Port != 9090 {
+		t.Errorf("Expected port 9090, got %d", cfg.Server.Port)
+	}
+	if cfg.Server.ReadTimeout != 60 {
+		t.Errorf("Expected read timeout 60, got %d", cfg.Server.ReadTimeout)
+	}
+
+	// Verify proxy configuration
+	if cfg.Proxy.LoadBalancer != "leastconn" {
+		t.Errorf("Expected load balancer 'leastconn', got %s", cfg.Proxy.LoadBalancer)
+	}
+	if len(cfg.Proxy.Targets) != 1 {
+		t.Errorf("Expected 1 target, got %d", len(cfg.Proxy.Targets))
+	}
+	if cfg.Proxy.Targets[0].Name != "test-target" {
+		t.Errorf("Expected target name 'test-target', got %s", cfg.Proxy.Targets[0].Name)
+	}
+
+	// Verify NAT configuration
+	if !cfg.NAT.Enabled {
+		t.Error("Expected NAT enabled to be true")
+	}
+	if cfg.NAT.STUNServer != "stun:stun.example.com:3478" {
+		t.Errorf("Expected STUN server 'stun:stun.example.com:3478', got %s", cfg.NAT.STUNServer)
+	}
+
+	// Verify logging configuration
+	if cfg.Logging.Level != "debug" {
+		t.Errorf("Expected log level 'debug', got %s", cfg.Logging.Level)
+	}
+	if cfg.Logging.Output != "file" {
+		t.Errorf("Expected log output 'file', got %s", cfg.Logging.Output)
+	}
+
+	// Verify monitor configuration
+	if !cfg.Monitor.Enabled {
+		t.Error("Expected monitor enabled to be true")
+	}
+	if cfg.Monitor.Port != 8081 {
+		t.Errorf("Expected monitor port 8081, got %d", cfg.Monitor.Port)
+	}
+	if !cfg.Monitor.Auth {
+		t.Error("Expected monitor auth to be true")
+	}
+}
+
+func TestLoadNonexistentFile(t *testing.T) {
+	_, err := Load("/nonexistent/path/config.yaml")
+	if err == nil {
+		t.Error("Expected error for nonexistent file, got nil")
+	}
+}
+
+func TestLoadInvalidYAML(t *testing.T) {
+	// Create a temporary directory for test files
+	tempDir := t.TempDir()
+	configPath := filepath.Join(tempDir, "invalid-config.yaml")
+
+	// Create an invalid YAML file
+	invalidYAML := `server:
+  port: 8080
+  read_timeout: "not a number"
+`
+
+	err := os.WriteFile(configPath, []byte(invalidYAML), 0644)
+	if err != nil {
+		t.Fatalf("Failed to write invalid config file: %v", err)
+	}
+
+	_, err = Load(configPath)
+	if err == nil {
+		t.Error("Expected error for invalid YAML, got nil")
+	}
+}
+
+func TestSetDefaults(t *testing.T) {
+	cfg := &Config{}
+
+	// Apply defaults
+	setDefaults(cfg)
+
+	// Verify default server values
+	if cfg.Server.Port != 8080 {
+		t.Errorf("Expected default port 8080, got %d", cfg.Server.Port)
+	}
+	if cfg.Server.ReadTimeout != 30 {
+		t.Errorf("Expected default read timeout 30, got %d", cfg.Server.ReadTimeout)
+	}
+
+	// Verify default proxy values
+	if cfg.Proxy.LoadBalancer != "roundrobin" {
+		t.Errorf("Expected default load balancer 'roundrobin', got %s", cfg.Proxy.LoadBalancer)
+	}
+	if cfg.Proxy.HealthCheckPath != "/health" {
+		t.Errorf("Expected default health check path '/health', got %s", cfg.Proxy.HealthCheckPath)
+	}
+
+	// Verify default NAT values
+	if cfg.NAT.Enabled {
+		t.Error("Expected default NAT enabled to be false")
+	}
+	if cfg.NAT.STUNServer != "stun:stun.l.google.com:19302" {
+		t.Errorf("Expected default STUN server 'stun:stun.l.google.com:19302', got %s", cfg.NAT.STUNServer)
+	}
+
+	// Verify default logging values
+	if cfg.Logging.Level != "info" {
+		t.Errorf("Expected default log level 'info', got %s", cfg.Logging.Level)
+	}
+	if cfg.Logging.Format != "json" {
+		t.Errorf("Expected default log format 'json', got %s", cfg.Logging.Format)
+	}
+
+	// Verify default monitor values
+	if !cfg.Monitor.Enabled {
+		t.Error("Expected default monitor enabled to be true")
+	}
+	if cfg.Monitor.Port != 9090 {
+		t.Errorf("Expected default monitor port 9090, got %d", cfg.Monitor.Port)
+	}
+}
+
+func TestCreateDefaultConfig(t *testing.T) {
+	// Create a temporary directory for test files
+	tempDir := t.TempDir()
+	configPath := filepath.Join(tempDir, "default-config.yaml")
+
+	// Create default configuration
+	err := CreateDefaultConfig(configPath)
+	if err != nil {
+		t.Fatalf("Failed to create default configuration: %v", err)
+	}
+
+	// Verify the file was created
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		t.Error("Expected config file to be created")
+	}
+
+	// Load and verify the configuration
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Failed to load created configuration: %v", err)
+	}
+
+	// Verify some default values
+	if cfg.Server.Port != 8080 {
+		t.Errorf("Expected default port 8080, got %d", cfg.Server.Port)
+	}
+	if cfg.Proxy.LoadBalancer != "roundrobin" {
+		t.Errorf("Expected default load balancer 'roundrobin', got %s", cfg.Proxy.LoadBalancer)
+	}
+	if cfg.Logging.Level != "info" {
+		t.Errorf("Expected default log level 'info', got %s", cfg.Logging.Level)
+	}
+}
+
+func TestCreateDefaultConfigDirectoryCreation(t *testing.T) {
+	// Create a temporary directory for test files
+	tempDir := t.TempDir()
+	nestedDir := filepath.Join(tempDir, "nested", "directory")
+	configPath := filepath.Join(nestedDir, "config.yaml")
+
+	// Create default configuration in a nested directory
+	err := CreateDefaultConfig(configPath)
+	if err != nil {
+		t.Fatalf("Failed to create default configuration: %v", err)
+	}
+
+	// Verify the directory was created
+	if _, err := os.Stat(nestedDir); os.IsNotExist(err) {
+		t.Error("Expected nested directory to be created")
+	}
+
+	// Verify the file was created
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		t.Error("Expected config file to be created")
+	}
+}
--- a/internal/logger/logger.go
+++ b/internal/logger/logger.go
@@ -0,0 +1,124 @@
+package logger
+
+import (
+	"log"
+	"os"
+)
+
+// Logger represents the application logger
+type Logger struct {
+	debugLogger *log.Logger
+	infoLogger  *log.Logger
+	warnLogger  *log.Logger
+	errorLogger *log.Logger
+}
+
+// Field represents a log field
+type Field struct {
+	Key   string
+	Value interface{}
+}
+
+// Option represents a logger option
+type Option func(*Logger)
+
+// NewLogger creates a new logger with default settings
+func NewLogger(opts ...Option) *Logger {
+	logger := &Logger{
+		debugLogger: log.New(os.Stdout, "DEBUG: ", log.Ldate|log.Ltime|log.Lshortfile),
+		infoLogger:  log.New(os.Stdout, "INFO: ", log.Ldate|log.Ltime|log.Lshortfile),
+		warnLogger:  log.New(os.Stdout, "WARN: ", log.Ldate|log.Ltime|log.Lshortfile),
+		errorLogger: log.New(os.Stdout, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile),
+	}
+
+	// Apply options
+	for _, opt := range opts {
+		opt(logger)
+	}
+
+	return logger
+}
+
+// Debug logs a debug message
+func (l *Logger) Debug(msg string, fields ...Field) {
+	l.debugLogger.Printf(formatMessage(msg, fields...))
+}
+
+// Info logs an info message
+func (l *Logger) Info(msg string, fields ...Field) {
+	l.infoLogger.Printf(formatMessage(msg, fields...))
+}
+
+// Warn logs a warning message
+func (l *Logger) Warn(msg string, fields ...Field) {
+	l.warnLogger.Printf(formatMessage(msg, fields...))
+}
+
+// Error logs an error message
+func (l *Logger) Error(msg string, fields ...Field) {
+	l.errorLogger.Printf(formatMessage(msg, fields...))
+}
+
+// Fatal logs a fatal message and exits
+func (l *Logger) Fatal(msg string, fields ...Field) {
+	l.errorLogger.Printf(formatMessage(msg, fields...))
+	os.Exit(1)
+}
+
+// String creates a string field
+func String(key, value string) Field {
+	return Field{Key: key, Value: value}
+}
+
+// Int creates an int field
+func Int(key string, value int) Field {
+	return Field{Key: key, Value: value}
+}
+
+// Bool creates a bool field
+func Bool(key string, value bool) Field {
+	return Field{Key: key, Value: value}
+}
+
+// Error creates an error field
+func Error(err error) Field {
+	return Field{Key: "error", Value: err}
+}
+
+// formatMessage formats a log message with fields
+func formatMessage(msg string, fields ...Field) string {
+	if len(fields) == 0 {
+		return msg
+	}
+
+	result := msg + " ["
+	for i, field := range fields {
+		if i > 0 {
+			result += ", "
+		}
+		result += field.Key + "="
+		result += toString(field.Value)
+	}
+	result += "]"
+
+	return result
+}
+
+// toString converts a value to string
+func toString(value interface{}) string {
+	switch v := value.(type) {
+	case string:
+		return v
+	case int:
+		return string(v)
+	case bool:
+		if v {
+			return "true"
+		}
+		return "false"
+	case error:
+		return v.Error()
+	default:
+		return "unknown"
+	}
+}
--- a/internal/logger/logger_test.go
+++ b/internal/logger/logger_test.go
@@ -0,0 +1,185 @@
+package logger
+
+import (
+	"bytes"
+	"log"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestNewLogger(t *testing.T) {
+	logger := NewLogger()
+	if logger == nil {
+		t.Error("Expected logger to be created, got nil")
+	}
+}
+
+func TestLoggerDebug(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	logger.Debug("Debug message", String("key", "value"))
+
+	output := buf.String()
+	if !strings.Contains(output, "DEBUG: Debug message") {
+		t.Errorf("Expected log output to contain 'DEBUG: Debug message', got %s", output)
+	}
+	if !strings.Contains(output, "key=value") {
+		t.Errorf("Expected log output to contain 'key=value', got %s", output)
+	}
+}
+
+func TestLoggerInfo(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	logger.Info("Info message", Int("number", 42))
+
+	output := buf.String()
+	if !strings.Contains(output, "INFO: Info message") {
+		t.Errorf("Expected log output to contain 'INFO: Info message', got %s", output)
+	}
+	if !strings.Contains(output, "number=42") {
+		t.Errorf("Expected log output to contain 'number=42', got %s", output)
+	}
+}
+
+func TestLoggerWarn(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	logger.Warn("Warning message", Bool("flag", true))
+
+	output := buf.String()
+	if !strings.Contains(output, "WARN: Warning message") {
+		t.Errorf("Expected log output to contain 'WARN: Warning message', got %s", output)
+	}
+	if !strings.Contains(output, "flag=true") {
+		t.Errorf("Expected log output to contain 'flag=true', got %s", output)
+	}
+}
+
+func TestLoggerError(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	err := os.ErrNotExist
+	logger.Error("Error message", Error(err))
+
+	output := buf.String()
+	if !strings.Contains(output, "ERROR: Error message") {
+		t.Errorf("Expected log output to contain 'ERROR: Error message', got %s", output)
+	}
+	if !strings.Contains(output, "error=file does not exist") {
+		t.Errorf("Expected log output to contain 'error=file does not exist', got %s", output)
+	}
+}
+
+func TestLoggerFatal(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	// Mock os.Exit to prevent the test from exiting
+	exitCalled := false
+	exitFunc := func(code int) {
+		exitCalled = true
+	}
+	osExit = exitFunc
+	defer func() {
+		osExit = realOsExit
+	}()
+
+	logger := NewLogger()
+	logger.Fatal("Fatal message", String("reason", "testing"))
+
+	output := buf.String()
+	if !strings.Contains(output, "ERROR: Fatal message") {
+		t.Errorf("Expected log output to contain 'ERROR: Fatal message', got %s", output)
+	}
+	if !strings.Contains(output, "reason=testing") {
+		t.Errorf("Expected log output to contain 'reason=testing', got %s", output)
+	}
+	if !exitCalled {
+		t.Error("Expected os.Exit to be called")
+	}
+}
+
+func TestLoggerMultipleFields(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	logger.Info("Multiple fields", 
+		String("string", "value"),
+		Int("int", 123),
+		Bool("bool", false))
+
+	output := buf.String()
+	if !strings.Contains(output, "INFO: Multiple fields") {
+		t.Errorf("Expected log output to contain 'INFO: Multiple fields', got %s", output)
+	}
+	if !strings.Contains(output, "string=value") {
+		t.Errorf("Expected log output to contain 'string=value', got %s", output)
+	}
+	if !strings.Contains(output, "int=123") {
+		t.Errorf("Expected log output to contain 'int=123', got %s", output)
+	}
+	if !strings.Contains(output, "bool=false") {
+		t.Errorf("Expected log output to contain 'bool=false', got %s", output)
+	}
+}
+
+func TestLoggerNoFields(t *testing.T) {
+	// Create a buffer to capture log output
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	logger := NewLogger()
+	logger.Info("No fields")
+
+	output := buf.String()
+	if !strings.Contains(output, "INFO: No fields") {
+		t.Errorf("Expected log output to contain 'INFO: No fields', got %s", output)
+	}
+	if strings.Contains(output, "[") {
+		t.Error("Expected log output to not contain field brackets when no fields are provided")
+	}
+}
+
+// Mock os.Exit for testing
+var (
+	osExit    = func(code int) { os.Exit(code) }
+	realOsExit = osExit
+)
--- a/internal/monitoring/monitoring.go
+++ b/internal/monitoring/monitoring.go
@@ -0,0 +1,266 @@
+package monitoring
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+	"github.com/iwasforcedtobehere/goRZ/internal/logger"
+)
+
+// Metrics represents the application metrics
+type Metrics struct {
+	RequestsTotal     int64                        `json:"requests_total"`
+	RequestsActive    int64                        `json:"requests_active"`
+	ResponsesByStatus map[string]int64             `json:"responses_by_status"`
+	TargetMetrics     map[string]*TargetMetric     `json:"target_metrics"`
+	StartTime         time.Time                    `json:"start_time"`
+	LastUpdated       time.Time                    `json:"last_updated"`
+	mu                sync.RWMutex                 `json:"-"`
+}
+
+// TargetMetric represents metrics for a specific target
+type TargetMetric struct {
+	RequestsTotal     int64         `json:"requests_total"`
+	ResponsesByStatus map[string]int64 `json:"responses_by_status"`
+	ResponseTimes     []time.Duration `json:"response_times"`
+	AvgResponseTime   time.Duration `json:"avg_response_time"`
+	Healthy           bool          `json:"healthy"`
+	LastChecked       time.Time     `json:"last_checked"`
+}
+
+// Monitor represents the monitoring service
+type Monitor struct {
+	config      *config.Config
+	logger      *logger.Logger
+	metrics     *Metrics
+	server      *http.Server
+	authHandler http.Handler
+}
+
+// NewMonitor creates a new monitoring service
+func NewMonitor(cfg *config.Config, logger *logger.Logger) *Monitor {
+	metrics := &Metrics{
+		ResponsesByStatus: make(map[string]int64),
+		TargetMetrics:    make(map[string]*TargetMetric),
+		StartTime:        time.Now(),
+		LastUpdated:      time.Now(),
+	}
+
+	// Initialize target metrics
+	for _, target := range cfg.Proxy.Targets {
+		metrics.TargetMetrics[target.Name] = &TargetMetric{
+			ResponsesByStatus: make(map[string]int64),
+			ResponseTimes:     make([]time.Duration, 0),
+			Healthy:           target.Healthy,
+			LastChecked:       time.Now(),
+		}
+	}
+
+	monitor := &Monitor{
+		config:  cfg,
+		logger:  logger,
+		metrics: metrics,
+	}
+
+	// Set up authentication if enabled
+	if cfg.Monitor.Auth {
+		monitor.authHandler = monitor.basicAuthHandler(monitor.metricsHandler)
+	} else {
+		monitor.authHandler = monitor.metricsHandler
+	}
+
+	return monitor
+}
+
+// Start starts the monitoring service
+func (m *Monitor) Start() error {
+	if !m.config.Monitor.Enabled {
+		m.logger.Info("Monitoring is disabled")
+		return nil
+	}
+
+	// Create HTTP server
+	m.server = &http.Server{
+		Addr:    fmt.Sprintf(":%d", m.config.Monitor.Port),
+		Handler: m.authHandler,
+	}
+
+	// Start server in a goroutine
+	go func() {
+		m.logger.Info("Monitoring server starting", logger.String("address", m.server.Addr))
+		if err := m.server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			m.logger.Error("Monitoring server failed", logger.Error(err))
+		}
+	}()
+
+	return nil
+}
+
+// Stop stops the monitoring service
+func (m *Monitor) Stop() {
+	if m.server != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		m.server.Shutdown(ctx)
+		m.logger.Info("Monitoring server stopped")
+	}
+}
+
+// metricsHandler handles HTTP requests for metrics
+func (m *Monitor) metricsHandler(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != m.config.Monitor.Path {
+		http.NotFound(w, r)
+		return
+	}
+
+	m.metrics.mu.RLock()
+	defer m.metrics.mu.RUnlock()
+
+	// Update last updated time
+	m.metrics.LastUpdated = time.Now()
+
+	// Set content type
+	w.Header().Set("Content-Type", "application/json")
+
+	// Encode metrics as JSON
+	if err := json.NewEncoder(w).Encode(m.metrics); err != nil {
+		m.logger.Error("Failed to encode metrics", logger.Error(err))
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+}
+
+// basicAuthHandler wraps a handler with basic authentication
+func (m *Monitor) basicAuthHandler(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		username, password, ok := r.BasicAuth()
+		if !ok || username != m.config.Monitor.Username || password != m.config.Monitor.Password {
+			w.Header().Set("WWW-Authenticate", `Basic realm="goRZ Monitor"`)
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+		next(w, r)
+	}
+}
+
+// IncrementRequest increments the total request count
+func (m *Monitor) IncrementRequest() {
+	m.metrics.mu.Lock()
+	defer m.metrics.mu.Unlock()
+
+	m.metrics.RequestsTotal++
+	m.metrics.LastUpdated = time.Now()
+}
+
+// IncrementActiveRequest increments the active request count
+func (m *Monitor) IncrementActiveRequest() {
+	m.metrics.mu.Lock()
+	defer m.metrics.mu.Unlock()
+
+	m.metrics.RequestsActive++
+	m.metrics.LastUpdated = time.Now()
+}
+
+// DecrementActiveRequest decrements the active request count
+func (m *Monitor) DecrementActiveRequest() {
+	m.metrics.mu.Lock()
+	defer m.metrics.mu.Unlock()
+
+	m.metrics.RequestsActive--
+	if m.metrics.RequestsActive < 0 {
+		m.metrics.RequestsActive = 0
+	}
+	m.metrics.LastUpdated = time.Now()
+}
+
+// RecordResponse records a response with the given status code
+func (m *Monitor) RecordResponse(statusCode int, targetName string, responseTime time.Duration) {
+	m.metrics.mu.Lock()
+	defer m.metrics.mu.Unlock()
+
+	status := fmt.Sprintf("%d", statusCode)
+	m.metrics.ResponsesByStatus[status]++
+
+	// Update target metrics
+	if target, exists := m.metrics.TargetMetrics[targetName]; exists {
+		target.RequestsTotal++
+		target.ResponsesByStatus[status]++
+		
+		// Keep only the last 100 response times for average calculation
+		if len(target.ResponseTimes) >= 100 {
+			target.ResponseTimes = target.ResponseTimes[1:]
+		}
+		target.ResponseTimes = append(target.ResponseTimes, responseTime)
+		
+		// Calculate average response time
+		var total time.Duration
+		for _, rt := range target.ResponseTimes {
+			total += rt
+		}
+		target.AvgResponseTime = total / time.Duration(len(target.ResponseTimes))
+	}
+
+	m.metrics.LastUpdated = time.Now()
+}
+
+// UpdateTargetHealth updates the health status of a target
+func (m *Monitor) UpdateTargetHealth(targetName string, healthy bool) {
+	m.metrics.mu.Lock()
+	defer m.metrics.mu.Unlock()
+
+	if target, exists := m.metrics.TargetMetrics[targetName]; exists {
+		target.Healthy = healthy
+		target.LastChecked = time.Now()
+	}
+
+	m.metrics.LastUpdated = time.Now()
+}
+
+// GetMetrics returns a copy of the current metrics
+func (m *Monitor) GetMetrics() Metrics {
+	m.metrics.mu.RLock()
+	defer m.metrics.mu.RUnlock()
+
+	// Create a deep copy of the metrics
+	metrics := Metrics{
+		RequestsTotal:     m.metrics.RequestsTotal,
+		RequestsActive:    m.metrics.RequestsActive,
+		ResponsesByStatus: make(map[string]int64),
+		TargetMetrics:     make(map[string]*TargetMetric),
+		StartTime:         m.metrics.StartTime,
+		LastUpdated:       m.metrics.LastUpdated,
+	}
+
+	// Copy response status counts
+	for k, v := range m.metrics.ResponsesByStatus {
+		metrics.ResponsesByStatus[k] = v
+	}
+
+	// Copy target metrics
+	for k, v := range m.metrics.TargetMetrics {
+		targetMetric := &TargetMetric{
+			RequestsTotal:     v.RequestsTotal,
+			ResponsesByStatus: make(map[string]int64),
+			ResponseTimes:     make([]time.Duration, len(v.ResponseTimes)),
+			AvgResponseTime:   v.AvgResponseTime,
+			Healthy:           v.Healthy,
+			LastChecked:       v.LastChecked,
+		}
+
+		// Copy response status counts for target
+		for rk, rv := range v.ResponsesByStatus {
+			targetMetric.ResponsesByStatus[rk] = rv
+		}
+
+		// Copy response times
+		copy(targetMetric.ResponseTimes, v.ResponseTimes)
+
+		metrics.TargetMetrics[k] = targetMetric
+	}
+
+	return metrics
+}
--- a/internal/monitoring/monitoring_test.go
+++ b/internal/monitoring/monitoring_test.go
@@ -0,0 +1,312 @@
+package monitoring
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+	"github.com/iwasforcedtobehere/goRZ/internal/logger"
+)
+
+func TestMonitorStartStop(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled: true,
+			Port:    9090,
+			Path:    "/metrics",
+			Auth:    false,
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Start the monitor
+	err := monitor.Start()
+	if err != nil {
+		t.Fatalf("Failed to start monitor: %v", err)
+	}
+
+	// Stop the monitor
+	monitor.Stop()
+
+	// Test that we can start and stop again
+	err = monitor.Start()
+	if err != nil {
+		t.Fatalf("Failed to start monitor: %v", err)
+	}
+	monitor.Stop()
+}
+
+func TestMonitorDisabled(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled: false,
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Start the monitor
+	err := monitor.Start()
+	if err != nil {
+		t.Fatalf("Failed to start monitor: %v", err)
+	}
+
+	// Stop the monitor
+	monitor.Stop()
+}
+
+func TestMonitorMetricsHandler(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled: true,
+			Port:    9090,
+			Path:    "/metrics",
+			Auth:    false,
+		},
+		Proxy: config.ProxyConfig{
+			Targets: []config.TargetConfig{
+				{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+				{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: false},
+			},
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Create a test HTTP server
+	server := httptest.NewServer(monitor.authHandler)
+	defer server.Close()
+
+	// Test metrics endpoint
+	resp, err := http.Get(server.URL + cfg.Monitor.Path)
+	if err != nil {
+		t.Fatalf("Failed to get metrics: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status code %d, got %d", http.StatusOK, resp.StatusCode)
+	}
+
+	// Decode and check metrics
+	var metrics Metrics
+	if err := json.NewDecoder(resp.Body).Decode(&metrics); err != nil {
+		t.Fatalf("Failed to decode metrics: %v", err)
+	}
+
+	if metrics.RequestsTotal != 0 {
+		t.Errorf("Expected requests total 0, got %d", metrics.RequestsTotal)
+	}
+	if metrics.RequestsActive != 0 {
+		t.Errorf("Expected requests active 0, got %d", metrics.RequestsActive)
+	}
+	if len(metrics.TargetMetrics) != 2 {
+		t.Errorf("Expected 2 target metrics, got %d", len(metrics.TargetMetrics))
+	}
+	if !metrics.TargetMetrics["target1"].Healthy {
+		t.Error("Expected target1 to be healthy")
+	}
+	if metrics.TargetMetrics["target2"].Healthy {
+		t.Error("Expected target2 to be unhealthy")
+	}
+}
+
+func TestMonitorBasicAuth(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled:  true,
+			Port:     9090,
+			Path:     "/metrics",
+			Auth:     true,
+			Username: "admin",
+			Password: "secret",
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Create a test HTTP server
+	server := httptest.NewServer(monitor.authHandler)
+	defer server.Close()
+
+	// Test without authentication
+	resp, err := http.Get(server.URL + cfg.Monitor.Path)
+	if err != nil {
+		t.Fatalf("Failed to get metrics: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusUnauthorized {
+		t.Errorf("Expected status code %d, got %d", http.StatusUnauthorized, resp.StatusCode)
+	}
+
+	// Test with incorrect authentication
+	req, err := http.NewRequest("GET", server.URL+cfg.Monitor.Path, nil)
+	if err != nil {
+		t.Fatalf("Failed to create request: %v", err)
+	}
+	req.SetBasicAuth("wrong", "credentials")
+
+	client := &http.Client{}
+	resp, err = client.Do(req)
+	if err != nil {
+		t.Fatalf("Failed to send request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusUnauthorized {
+		t.Errorf("Expected status code %d, got %d", http.StatusUnauthorized, resp.StatusCode)
+	}
+
+	// Test with correct authentication
+	req, err = http.NewRequest("GET", server.URL+cfg.Monitor.Path, nil)
+	if err != nil {
+		t.Fatalf("Failed to create request: %v", err)
+	}
+	req.SetBasicAuth(cfg.Monitor.Username, cfg.Monitor.Password)
+
+	resp, err = client.Do(req)
+	if err != nil {
+		t.Fatalf("Failed to send request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status code %d, got %d", http.StatusOK, resp.StatusCode)
+	}
+}
+
+func TestMonitorMetricsTracking(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled: true,
+			Port:    9090,
+			Path:    "/metrics",
+			Auth:    false,
+		},
+		Proxy: config.ProxyConfig{
+			Targets: []config.TargetConfig{
+				{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+			},
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Test incrementing request count
+	monitor.IncrementRequest()
+	metrics := monitor.GetMetrics()
+	if metrics.RequestsTotal != 1 {
+		t.Errorf("Expected requests total 1, got %d", metrics.RequestsTotal)
+	}
+
+	// Test incrementing active request count
+	monitor.IncrementActiveRequest()
+	metrics = monitor.GetMetrics()
+	if metrics.RequestsActive != 1 {
+		t.Errorf("Expected requests active 1, got %d", metrics.RequestsActive)
+	}
+
+	// Test decrementing active request count
+	monitor.DecrementActiveRequest()
+	metrics = monitor.GetMetrics()
+	if metrics.RequestsActive != 0 {
+		t.Errorf("Expected requests active 0, got %d", metrics.RequestsActive)
+	}
+
+	// Test recording response
+	monitor.RecordResponse(http.StatusOK, "target1", 100*time.Millisecond)
+	metrics = monitor.GetMetrics()
+	if metrics.ResponsesByStatus["200"] != 1 {
+		t.Errorf("Expected 1 response with status 200, got %d", metrics.ResponsesByStatus["200"])
+	}
+	if metrics.TargetMetrics["target1"].RequestsTotal != 1 {
+		t.Errorf("Expected target1 to have 1 request, got %d", metrics.TargetMetrics["target1"].RequestsTotal)
+	}
+	if metrics.TargetMetrics["target1"].ResponsesByStatus["200"] != 1 {
+		t.Errorf("Expected target1 to have 1 response with status 200, got %d", metrics.TargetMetrics["target1"].ResponsesByStatus["200"])
+	}
+	if len(metrics.TargetMetrics["target1"].ResponseTimes) != 1 {
+		t.Errorf("Expected target1 to have 1 response time, got %d", len(metrics.TargetMetrics["target1"].ResponseTimes))
+	}
+	if metrics.TargetMetrics["target1"].AvgResponseTime != 100*time.Millisecond {
+		t.Errorf("Expected target1 to have average response time 100ms, got %v", metrics.TargetMetrics["target1"].AvgResponseTime)
+	}
+
+	// Test updating target health
+	monitor.UpdateTargetHealth("target1", false)
+	metrics = monitor.GetMetrics()
+	if metrics.TargetMetrics["target1"].Healthy {
+		t.Error("Expected target1 to be unhealthy")
+	}
+}
+
+func TestMonitorMultipleResponses(t *testing.T) {
+	cfg := &config.Config{
+		Monitor: config.MonitorConfig{
+			Enabled: true,
+			Port:    9090,
+			Path:    "/metrics",
+			Auth:    false,
+		},
+		Proxy: config.ProxyConfig{
+			Targets: []config.TargetConfig{
+				{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+			},
+		},
+	}
+
+	logger := logger.NewLogger()
+	monitor := NewMonitor(cfg, logger)
+
+	// Record multiple responses with different status codes and response times
+	monitor.RecordResponse(http.StatusOK, "target1", 100*time.Millisecond)
+	monitor.RecordResponse(http.StatusOK, "target1", 200*time.Millisecond)
+	monitor.RecordResponse(http.StatusNotFound, "target1", 50*time.Millisecond)
+	monitor.RecordResponse(http.StatusInternalServerError, "target1", 300*time.Millisecond)
+
+	metrics := monitor.GetMetrics()
+
+	// Check overall metrics
+	if metrics.RequestsTotal != 0 {
+		t.Errorf("Expected requests total 0, got %d", metrics.RequestsTotal)
+	}
+	if metrics.ResponsesByStatus["200"] != 2 {
+		t.Errorf("Expected 2 responses with status 200, got %d", metrics.ResponsesByStatus["200"])
+	}
+	if metrics.ResponsesByStatus["404"] != 1 {
+		t.Errorf("Expected 1 response with status 404, got %d", metrics.ResponsesByStatus["404"])
+	}
+	if metrics.ResponsesByStatus["500"] != 1 {
+		t.Errorf("Expected 1 response with status 500, got %d", metrics.ResponsesByStatus["500"])
+	}
+
+	// Check target metrics
+	if metrics.TargetMetrics["target1"].RequestsTotal != 4 {
+		t.Errorf("Expected target1 to have 4 requests, got %d", metrics.TargetMetrics["target1"].RequestsTotal)
+	}
+	if metrics.TargetMetrics["target1"].ResponsesByStatus["200"] != 2 {
+		t.Errorf("Expected target1 to have 2 responses with status 200, got %d", metrics.TargetMetrics["target1"].ResponsesByStatus["200"])
+	}
+	if metrics.TargetMetrics["target1"].ResponsesByStatus["404"] != 1 {
+		t.Errorf("Expected target1 to have 1 response with status 404, got %d", metrics.TargetMetrics["target1"].ResponsesByStatus["404"])
+	}
+	if metrics.TargetMetrics["target1"].ResponsesByStatus["500"] != 1 {
+		t.Errorf("Expected target1 to have 1 response with status 500, got %d", metrics.TargetMetrics["target1"].ResponsesByStatus["500"])
+	}
+
+	// Check average response time
+	expectedAvg := time.Duration((100 + 200 + 50 + 300) / 4)
+	if metrics.TargetMetrics["target1"].AvgResponseTime != expectedAvg {
+		t.Errorf("Expected target1 to have average response time %v, got %v", expectedAvg, metrics.TargetMetrics["target1"].AvgResponseTime)
+	}
+}
--- a/internal/nat/nat.go
+++ b/internal/nat/nat.go
@@ -0,0 +1,231 @@
+package nat
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+	"github.com/iwasforcedtobehere/goRZ/internal/logger"
+	"github.com/pion/stun"
+	"github.com/pion/turn/v2"
+)
+
+// NATTraversal handles NAT traversal for the proxy server
+type NATTraversal struct {
+	config      *config.Config
+	logger      *logger.Logger
+	conn        net.PacketConn
+	externalIP  net.IP
+	externalPort int
+	mu          sync.RWMutex
+	running     bool
+}
+
+// NewNATTraversal creates a new NAT traversal instance
+func NewNATTraversal(cfg *config.Config, logger *logger.Logger) *NATTraversal {
+	return &NATTraversal{
+		config: cfg,
+		logger: logger,
+	}
+}
+
+// Start starts the NAT traversal process
+func (n *NATTraversal) Start() error {
+	if !n.config.NAT.Enabled {
+		n.logger.Info("NAT traversal is disabled")
+		return nil
+	}
+
+	n.mu.Lock()
+	defer n.mu.Unlock()
+
+	if n.running {
+		return fmt.Errorf("NAT traversal is already running")
+	}
+
+	// Create a UDP listener
+	conn, err := net.ListenPacket("udp4", "0.0.0.0:0")
+	if err != nil {
+		return fmt.Errorf("failed to create UDP listener: %w", err)
+	}
+	n.conn = conn
+
+	// Get external IP and port using STUN
+	if err := n.discoverExternalAddress(); err != nil {
+		conn.Close()
+		return fmt.Errorf("failed to discover external address: %w", err)
+	}
+
+	// Start TURN client if configured
+	if n.config.NAT.TURNServer != "" {
+		if err := n.startTURNClient(); err != nil {
+			conn.Close()
+			return fmt.Errorf("failed to start TURN client: %w", err)
+		}
+	}
+
+	n.running = true
+	n.logger.Info("NAT traversal started", 
+		logger.String("external_ip", n.externalIP.String()),
+		logger.Int("external_port", n.externalPort))
+
+	return nil
+}
+
+// Stop stops the NAT traversal process
+func (n *NATTraversal) Stop() {
+	n.mu.Lock()
+	defer n.mu.Unlock()
+
+	if !n.running {
+		return
+	}
+
+	if n.conn != nil {
+		n.conn.Close()
+		n.conn = nil
+	}
+
+	n.running = false
+	n.logger.Info("NAT traversal stopped")
+}
+
+// discoverExternalAddress discovers the external IP and port using STUN
+func (n *NATTraversal) discoverExternalAddress() error {
+	// Parse STUN server URL
+	stunURL, err := stun.ParseURI(n.config.NAT.STUNServer)
+	if err != nil {
+		return fmt.Errorf("failed to parse STUN server URL: %w", err)
+	}
+
+	// Create STUN client
+	client, err := stun.NewClient("udp4", n.conn)
+	if err != nil {
+		return fmt.Errorf("failed to create STUN client: %w", err)
+	}
+	defer client.Close()
+
+	// Send binding request
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	mappedAddr, err := client.Request(ctx, stunURL, stun.BindingRequest)
+	if err != nil {
+		return fmt.Errorf("STUN binding request failed: %w", err)
+	}
+
+	n.externalIP = mappedAddr.IP
+	n.externalPort = mappedAddr.Port
+
+	return nil
+}
+
+// startTURNClient starts a TURN client for relay connections
+func (n *NATTraversal) startTURNClient() error {
+	// Parse TURN server URL
+	turnURL, err := turn.ParseURI(n.config.NAT.TURNServer)
+	if err != nil {
+		return fmt.Errorf("failed to parse TURN server URL: %w", err)
+	}
+
+	// Create TURN client config
+	cfg := &turn.ClientConfig{
+		STUNServerAddr: n.config.NAT.STUNServer,
+		TURNServerAddr: n.config.NAT.TURNServer,
+		Username:       n.config.NAT.TURNUsername,
+		Credential:     n.config.NAT.TURNPassword,
+		LoggerFactory:  nil, // We'll use our own logger
+	}
+
+	// Create TURN client
+	client, err := turn.NewClient(cfg)
+	if err != nil {
+		return fmt.Errorf("failed to create TURN client: %w", err)
+	}
+	defer client.Close()
+
+	// Listen on provided conn
+	n.logger.Info("TURN client started", logger.String("server", n.config.NAT.TURNServer))
+
+	return nil
+}
+
+// GetExternalAddress returns the external IP and port
+func (n *NATTraversal) GetExternalAddress() (net.IP, int) {
+	n.mu.RLock()
+	defer n.mu.RUnlock()
+
+	return n.externalIP, n.externalPort
+}
+
+// IsRunning returns whether NAT traversal is running
+func (n *NATTraversal) IsRunning() bool {
+	n.mu.RLock()
+	defer n.mu.RUnlock()
+
+	return n.running
+}
+
+// CreateHolePunch attempts to create a hole in the NAT for direct peer-to-peer connections
+func (n *NATTraversal) CreateHolePunch(peerAddr string) (net.Conn, error) {
+	if !n.running {
+		return nil, fmt.Errorf("NAT traversal is not running")
+	}
+
+	// Parse peer address
+	udpAddr, err := net.ResolveUDPAddr("udp4", peerAddr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve peer address: %w", err)
+	}
+
+	// Create UDP connection
+	conn, err := net.DialUDP("udp4", nil, udpAddr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create UDP connection: %w", err)
+	}
+
+	// Send a small packet to punch a hole in the NAT
+	_, err = conn.Write([]byte("punch"))
+	if err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("failed to punch hole: %w", err)
+	}
+
+	n.logger.Debug("Hole punch attempted", logger.String("peer", peerAddr))
+
+	return conn, nil
+}
+
+// GetNATType attempts to determine the type of NAT
+func (n *NATTraversal) GetNATType() (string, error) {
+	if !n.running {
+		return "", fmt.Errorf("NAT traversal is not running")
+	}
+
+	// This is a simplified NAT type detection
+	// In a real implementation, you would use more sophisticated methods
+	// like the one described in RFC 3489 and RFC 5780
+
+	// For now, we'll return a generic response
+	return "Unknown", nil
+}
+
+// CreateRelayConnection creates a relay connection through TURN
+func (n *NATTraversal) CreateRelayConnection(peerAddr string) (net.Conn, error) {
+	if !n.running {
+		return nil, fmt.Errorf("NAT traversal is not running")
+	}
+
+	if n.config.NAT.TURNServer == "" {
+		return nil, fmt.Errorf("TURN server not configured")
+	}
+
+	// This is a placeholder for TURN relay connection creation
+	// In a real implementation, you would use the TURN client to allocate
+	// a relay and create a connection to the peer
+
+	return nil, fmt.Errorf("not implemented")
+}
--- a/internal/proxy/loadbalancer.go
+++ b/internal/proxy/loadbalancer.go
@@ -0,0 +1,217 @@
+package proxy
+
+import (
+	"math/rand"
+	"sync"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+)
+
+// RoundRobinLoadBalancer implements round-robin load balancing
+type RoundRobinLoadBalancer struct {
+	targets []*config.TargetConfig
+	current int
+	mu      sync.Mutex
+}
+
+// NewRoundRobinLoadBalancer creates a new round-robin load balancer
+func NewRoundRobinLoadBalancer(targets []config.TargetConfig) *RoundRobinLoadBalancer {
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+	return &RoundRobinLoadBalancer{
+		targets: t,
+		current: 0,
+	}
+}
+
+// NextTarget returns the next target using round-robin algorithm
+func (lb *RoundRobinLoadBalancer) NextTarget() (*config.TargetConfig, error) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	// Filter healthy targets
+	healthyTargets := make([]*config.TargetConfig, 0)
+	for _, target := range lb.targets {
+		if target.Healthy {
+			healthyTargets = append(healthyTargets, target)
+		}
+	}
+
+	if len(healthyTargets) == 0 {
+		return nil, ErrNoHealthyTargets
+	}
+
+	// Get next target
+	target := healthyTargets[lb.current%len(healthyTargets)]
+	lb.current = (lb.current + 1) % len(healthyTargets)
+
+	return target, nil
+}
+
+// UpdateTargets updates the targets list
+func (lb *RoundRobinLoadBalancer) UpdateTargets(targets []config.TargetConfig) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+	lb.targets = t
+	lb.current = 0
+}
+
+// RandomLoadBalancer implements random load balancing
+type RandomLoadBalancer struct {
+	targets []*config.TargetConfig
+	rand    *rand.Rand
+	mu      sync.Mutex
+}
+
+// NewRandomLoadBalancer creates a new random load balancer
+func NewRandomLoadBalancer(targets []config.TargetConfig) *RandomLoadBalancer {
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+	return &RandomLoadBalancer{
+		targets: t,
+		rand:    rand.New(rand.NewSource(time.Now().UnixNano())),
+	}
+}
+
+// NextTarget returns a random target
+func (lb *RandomLoadBalancer) NextTarget() (*config.TargetConfig, error) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	// Filter healthy targets
+	healthyTargets := make([]*config.TargetConfig, 0)
+	for _, target := range lb.targets {
+		if target.Healthy {
+			healthyTargets = append(healthyTargets, target)
+		}
+	}
+
+	if len(healthyTargets) == 0 {
+		return nil, ErrNoHealthyTargets
+	}
+
+	// Get random target
+	index := lb.rand.Intn(len(healthyTargets))
+	return healthyTargets[index], nil
+}
+
+// UpdateTargets updates the targets list
+func (lb *RandomLoadBalancer) UpdateTargets(targets []config.TargetConfig) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+	lb.targets = t
+}
+
+// LeastConnectionsLoadBalancer implements least connections load balancing
+type LeastConnectionsLoadBalancer struct {
+	targets      []*config.TargetConfig
+	connections map[string]int
+	mu          sync.Mutex
+}
+
+// NewLeastConnectionsLoadBalancer creates a new least connections load balancer
+func NewLeastConnectionsLoadBalancer(targets []config.TargetConfig) *LeastConnectionsLoadBalancer {
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+
+	connections := make(map[string]int)
+	for _, target := range t {
+		connections[target.Name] = 0
+	}
+
+	return &LeastConnectionsLoadBalancer{
+		targets:      t,
+		connections: connections,
+	}
+}
+
+// NextTarget returns the target with the least connections
+func (lb *LeastConnectionsLoadBalancer) NextTarget() (*config.TargetConfig, error) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	// Filter healthy targets and find the one with least connections
+	var selectedTarget *config.TargetConfig
+	minConnections := -1
+
+	for _, target := range lb.targets {
+		if target.Healthy {
+			connections := lb.connections[target.Name]
+			if minConnections == -1 || connections < minConnections {
+				minConnections = connections
+				selectedTarget = target
+			}
+		}
+	}
+
+	if selectedTarget == nil {
+		return nil, ErrNoHealthyTargets
+	}
+
+	// Increment connection count
+	lb.connections[selectedTarget.Name]++
+
+	return selectedTarget, nil
+}
+
+// ReleaseConnection decrements the connection count for a target
+func (lb *LeastConnectionsLoadBalancer) ReleaseConnection(targetName string) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	if count, exists := lb.connections[targetName]; exists && count > 0 {
+		lb.connections[targetName] = count - 1
+	}
+}
+
+// UpdateTargets updates the targets list
+func (lb *LeastConnectionsLoadBalancer) UpdateTargets(targets []config.TargetConfig) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	t := make([]*config.TargetConfig, len(targets))
+	for i := range targets {
+		t[i] = &targets[i]
+	}
+
+	// Update connections map
+	connections := make(map[string]int)
+	for _, target := range t {
+		// Preserve existing connection count if target exists
+		if count, exists := lb.connections[target.Name]; exists {
+			connections[target.Name] = count
+		} else {
+			connections[target.Name] = 0
+		}
+	}
+
+	lb.targets = t
+	lb.connections = connections
+}
+
+// ErrNoHealthyTargets is returned when no healthy targets are available
+var ErrNoHealthyTargets = errorString("no healthy targets available")
+
+// errorString is a simple string-based error type
+type errorString string
+
+func (e errorString) Error() string {
+	return string(e)
+}
--- a/internal/proxy/loadbalancer_test.go
+++ b/internal/proxy/loadbalancer_test.go
@@ -0,0 +1,270 @@
+package proxy
+
+import (
+	"testing"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+)
+
+func TestRoundRobinLoadBalancer(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewRoundRobinLoadBalancer(targets)
+
+	// Test that targets are selected in round-robin order
+	for i := 0; i < 6; i++ {
+		target, err := lb.NextTarget()
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		expectedTarget := targets[i%3]
+		if target.Name != expectedTarget.Name {
+			t.Errorf("Expected target %s, got %s", expectedTarget.Name, target.Name)
+		}
+	}
+}
+
+func TestRoundRobinLoadBalancerWithUnhealthyTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: false},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewRoundRobinLoadBalancer(targets)
+
+	// Test that only healthy targets are selected
+	for i := 0; i < 4; i++ {
+		target, err := lb.NextTarget()
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		if target.Name == "target2" {
+			t.Errorf("Selected unhealthy target: %s", target.Name)
+		}
+
+		// Should alternate between target1 and target3
+		if i%2 == 0 && target.Name != "target1" {
+			t.Errorf("Expected target1, got %s", target.Name)
+		}
+		if i%2 == 1 && target.Name != "target3" {
+			t.Errorf("Expected target3, got %s", target.Name)
+		}
+	}
+}
+
+func TestRoundRobinLoadBalancerNoHealthyTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: false},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: false},
+	}
+
+	lb := NewRoundRobinLoadBalancer(targets)
+
+	_, err := lb.NextTarget()
+	if err != ErrNoHealthyTargets {
+		t.Errorf("Expected ErrNoHealthyTargets, got %v", err)
+	}
+}
+
+func TestRoundRobinLoadBalancerUpdateTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewRoundRobinLoadBalancer(targets)
+
+	// Get first target
+	target, err := lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target1" {
+		t.Errorf("Expected target1, got %s", target.Name)
+	}
+
+	// Update targets
+	newTargets := []config.TargetConfig{
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+	lb.UpdateTargets(newTargets)
+
+	// Test that new targets are selected
+	for i := 0; i < 4; i++ {
+		target, err := lb.NextTarget()
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		expectedTarget := newTargets[i%2]
+		if target.Name != expectedTarget.Name {
+			t.Errorf("Expected target %s, got %s", expectedTarget.Name, target.Name)
+		}
+	}
+}
+
+func TestRandomLoadBalancer(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewRandomLoadBalancer(targets)
+
+	// Test that targets are selected randomly
+	// We'll just check that we don't get errors and that all targets are eventually selected
+	selected := make(map[string]bool)
+	for i := 0; i < 100; i++ {
+		target, err := lb.NextTarget()
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+		selected[target.Name] = true
+	}
+
+	// Check that all targets were selected at least once
+	for _, target := range targets {
+		if !selected[target.Name] {
+			t.Errorf("Target %s was never selected", target.Name)
+		}
+	}
+}
+
+func TestRandomLoadBalancerWithUnhealthyTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: false},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewRandomLoadBalancer(targets)
+
+	// Test that only healthy targets are selected
+	for i := 0; i < 100; i++ {
+		target, err := lb.NextTarget()
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		if target.Name == "target2" {
+			t.Errorf("Selected unhealthy target: %s", target.Name)
+		}
+	}
+}
+
+func TestLeastConnectionsLoadBalancer(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewLeastConnectionsLoadBalancer(targets)
+
+	// Initially, both targets should have 0 connections
+	// The first target should be selected
+	target, err := lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target1" {
+		t.Errorf("Expected target1, got %s", target.Name)
+	}
+
+	// Now target1 should have 1 connection, target2 should have 0
+	// So target2 should be selected
+	target, err = lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target2" {
+		t.Errorf("Expected target2, got %s", target.Name)
+	}
+
+	// Now both targets should have 1 connection
+	// target1 should be selected again
+	target, err = lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target1" {
+		t.Errorf("Expected target1, got %s", target.Name)
+	}
+
+	// Release a connection from target1
+	lb.(*LeastConnectionsLoadBalancer).ReleaseConnection("target1")
+
+	// Now target1 should have 1 connection, target2 should have 1 connection
+	// But since we released from target1, it should be selected
+	target, err = lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target1" {
+		t.Errorf("Expected target1, got %s", target.Name)
+	}
+}
+
+func TestLeastConnectionsLoadBalancerUpdateTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: true},
+	}
+
+	lb := NewLeastConnectionsLoadBalancer(targets)
+
+	// Get first target
+	target, err := lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target1" {
+		t.Errorf("Expected target1, got %s", target.Name)
+	}
+
+	// Update targets
+	newTargets := []config.TargetConfig{
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: true},
+		{Name: "target3", Address: "http://localhost:8083", Protocol: "http", Weight: 1, Healthy: true},
+	}
+	lb.UpdateTargets(newTargets)
+
+	// Test that new targets are selected
+	// The first new target should be selected
+	target, err = lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target2" {
+		t.Errorf("Expected target2, got %s", target.Name)
+	}
+
+	// The second new target should be selected
+	target, err = lb.NextTarget()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if target.Name != "target3" {
+		t.Errorf("Expected target3, got %s", target.Name)
+	}
+}
+
+func TestLeastConnectionsLoadBalancerNoHealthyTargets(t *testing.T) {
+	targets := []config.TargetConfig{
+		{Name: "target1", Address: "http://localhost:8081", Protocol: "http", Weight: 1, Healthy: false},
+		{Name: "target2", Address: "http://localhost:8082", Protocol: "http", Weight: 1, Healthy: false},
+	}
+
+	lb := NewLeastConnectionsLoadBalancer(targets)
+
+	_, err := lb.NextTarget()
+	if err != ErrNoHealthyTargets {
+		t.Errorf("Expected ErrNoHealthyTargets, got %v", err)
+	}
+}
--- a/internal/proxy/proxy.go
+++ b/internal/proxy/proxy.go
@@ -0,0 +1,238 @@
+package proxy
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"sync"
+	"time"
+
+	"github.com/iwasforcedtobehere/goRZ/internal/config"
+	"github.com/iwasforcedtobehere/goRZ/internal/logger"
+)
+
+// Server represents the reverse proxy server
+type Server struct {
+	config      *config.Config
+	logger      *logger.Logger
+	loadBalancer LoadBalancer
+	healthChecker *HealthChecker
+}
+
+// LoadBalancer defines the interface for load balancing strategies
+type LoadBalancer interface {
+	NextTarget() (*config.TargetConfig, error)
+	UpdateTargets(targets []config.TargetConfig)
+}
+
+// HealthChecker handles health checking for proxy targets
+type HealthChecker struct {
+	config     *config.Config
+	logger     *logger.Logger
+	targets    map[string]*config.TargetConfig
+	httpClient *http.Client
+	stopChan   chan struct{}
+	mu         sync.RWMutex
+}
+
+// NewServer creates a new reverse proxy server
+func NewServer(cfg *config.Config, logger *logger.Logger) (*Server, error) {
+	// Create load balancer based on configuration
+	var lb LoadBalancer
+	switch cfg.Proxy.LoadBalancer {
+	case "roundrobin":
+		lb = NewRoundRobinLoadBalancer(cfg.Proxy.Targets)
+	case "leastconn":
+		lb = NewLeastConnectionsLoadBalancer(cfg.Proxy.Targets)
+	case "random":
+		lb = NewRandomLoadBalancer(cfg.Proxy.Targets)
+	default:
+		return nil, fmt.Errorf("unsupported load balancer: %s", cfg.Proxy.LoadBalancer)
+	}
+
+	// Create health checker
+	healthChecker := NewHealthChecker(cfg, logger)
+
+	return &Server{
+		config:       cfg,
+		logger:       logger,
+		loadBalancer: lb,
+		healthChecker: healthChecker,
+	}, nil
+}
+
+// ServeHTTP handles HTTP requests
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Get next target based on load balancing strategy
+	target, err := s.loadBalancer.NextTarget()
+	if err != nil {
+		s.logger.Error("Failed to get target", logger.Error(err))
+		http.Error(w, "Service unavailable", http.StatusServiceUnavailable)
+		return
+	}
+
+	// Check if target is healthy
+	if !target.Healthy {
+		s.logger.Warn("Target is unhealthy", logger.String("target", target.Name))
+		http.Error(w, "Service unavailable", http.StatusServiceUnavailable)
+		return
+	}
+
+	// Create reverse proxy
+	targetURL, err := url.Parse(target.Address)
+	if err != nil {
+		s.logger.Error("Failed to parse target URL", 
+			logger.String("target", target.Name), 
+			logger.String("address", target.Address),
+			logger.Error(err))
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+
+	proxy := httputil.NewSingleHostReverseProxy(targetURL)
+
+	// Set up custom director to modify request
+	originalDirector := proxy.Director
+	proxy.Director = func(req *http.Request) {
+		originalDirector(req)
+		// Add custom headers
+		req.Header.Set("X-Forwarded-Host", req.Host)
+		req.Header.Set("X-Forwarded-Proto", "https")
+		if req.TLS != nil {
+			req.Header.Set("X-Forwarded-Ssl", "on")
+		}
+		// Add proxy identification
+		req.Header.Set("X-Proxy-Server", "goRZ")
+	}
+
+	// Set up error handler
+	proxy.ErrorHandler = func(w http.ResponseWriter, r *http.Request, err error) {
+		s.logger.Error("Proxy error", logger.Error(err))
+		http.Error(w, "Proxy error", http.StatusBadGateway)
+	}
+
+	// Set up modify response handler
+	proxy.ModifyResponse = func(resp *http.Response) error {
+		// Add custom headers to response
+		resp.Header.Set("X-Served-By", "goRZ")
+		resp.Header.Set("X-Target", target.Name)
+		return nil
+	}
+
+	// Serve the request
+	s.logger.Debug("Proxying request", 
+		logger.String("method", r.Method),
+		logger.String("path", r.URL.Path),
+		logger.String("target", target.Name))
+
+	proxy.ServeHTTP(w, r)
+}
+
+// Start starts the proxy server
+func (s *Server) Start() error {
+	// Start health checker
+	if err := s.healthChecker.Start(); err != nil {
+		return fmt.Errorf("failed to start health checker: %w", err)
+	}
+	return nil
+}
+
+// Stop stops the proxy server
+func (s *Server) Stop() {
+	s.healthChecker.Stop()
+}
+
+// NewHealthChecker creates a new health checker
+func NewHealthChecker(cfg *config.Config, logger *logger.Logger) *HealthChecker {
+	targets := make(map[string]*config.TargetConfig)
+	for i := range cfg.Proxy.Targets {
+		targets[cfg.Proxy.Targets[i].Name] = &cfg.Proxy.Targets[i]
+	}
+
+	return &HealthChecker{
+		config:     cfg,
+		logger:     logger,
+		targets:    targets,
+		httpClient: &http.Client{Timeout: 5 * time.Second},
+		stopChan:   make(chan struct{}),
+	}
+}
+
+// Start starts the health checker
+func (h *HealthChecker) Start() error {
+	// Initial health check
+	h.checkAllTargets()
+
+	// Start periodic health checks
+	go func() {
+		ticker := time.NewTicker(time.Duration(h.config.Proxy.HealthCheckInterval) * time.Second)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ticker.C:
+				h.checkAllTargets()
+			case <-h.stopChan:
+				return
+			}
+		}
+	}()
+
+	return nil
+}
+
+// Stop stops the health checker
+func (h *HealthChecker) Stop() {
+	close(h.stopChan)
+}
+
+// checkAllTargets checks the health of all targets
+func (h *HealthChecker) checkAllTargets() {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	for name, target := range h.targets {
+		healthy := h.checkTargetHealth(target)
+		if target.Healthy != healthy {
+			h.logger.Info("Target health status changed", 
+				logger.String("target", name), 
+				logger.Bool("healthy", healthy))
+			target.Healthy = healthy
+		}
+	}
+}
+
+// checkTargetHealth checks the health of a single target
+func (h *HealthChecker) checkTargetHealth(target *config.TargetConfig) bool {
+	targetURL, err := url.Parse(target.Address)
+	if err != nil {
+		h.logger.Error("Failed to parse target URL for health check", 
+			logger.String("target", target.Name),
+			logger.Error(err))
+		return false
+	}
+
+	healthURL := *targetURL
+	healthURL.Path = h.config.Proxy.HealthCheckPath
+
+	req, err := http.NewRequest("GET", healthURL.String(), nil)
+	if err != nil {
+		h.logger.Error("Failed to create health check request", 
+			logger.String("target", target.Name),
+			logger.Error(err))
+		return false
+	}
+
+	resp, err := h.httpClient.Do(req)
+	if err != nil {
+		h.logger.Error("Health check request failed", 
+			logger.String("target", target.Name),
+			logger.Error(err))
+		return false
+	}
+	defer resp.Body.Close()
+
+	return resp.StatusCode == http.StatusOK
+}