working base

scripts/setup-router.sh

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+#!/bin/sh
+
+set -e
+
+ROUTER_TYPE="$1"
+
+echo "Setting up $ROUTER_TYPE router..."
+
+# fix dns 
+echo "nameserver 192.168.10.1" > /etc/resolv.conf
+
+apk add --no-cache iputils iptables
+
+# Enable IP forwarding
+echo 1 > /proc/sys/net/ipv4/ip_forward
+sysctl -w net.ipv4.ip_forward=1
+
+if [ "$ROUTER_TYPE" = "primary" ]; then
+    echo "Configuring PRIMARY router (192.168.200.11 192.168.202.11 172.17.0.2)"
+    
+    ip addr show
+    echo "Routes:"
+    ip route show
+    
+    # NAT for traffic from primary network to target network
+    iptables -t nat -A POSTROUTING -s 192.168.200.0/24 -d 192.168.202.0/24 -j MASQUERADE
+    iptables -P FORWARD ACCEPT
+
+elif [ "$ROUTER_TYPE" = "secondary" ]; then
+    echo "Configuring SECONDARY router (192.168.201.11 ↔ 192.168.202.12 ↔ 172.17.0.3)"
+    
+    ip addr show
+    echo "Routes:"
+    ip route show
+    
+    # NAT for traffic from secondary network to target network
+    iptables -t nat -A POSTROUTING -s 192.168.201.0/24 -d 192.168.202.0/24 -j MASQUERADE
+    iptables -P FORWARD ACCEPT
+else
+    echo "Error: Invalid router type. Use 'primary' or 'secondary'"
+    exit 1
+fi
+
+echo "Secondary router setup complete"
+echo "NAT rules:"
+iptables -t nat -L POSTROUTING -n -v
+
+# Keep container running
+echo "Router is running. Monitoring interfaces..."
+while true; do
+    echo "$(date): Router $ROUTER_TYPE status - interfaces up"
+    sleep 60
+done

scripts/test-failover.sh

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+#!/bin/bash
+
+set -e
+
+echo "=== Route-Switcher Failover Test Script ==="
+echo
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to print colored output
+print_status() {
+    echo -e "${GREEN}[INFO]${NC} $1"
+}
+
+print_warning() {
+    echo -e "${YELLOW}[WARN]${NC} $1"
+}
+
+print_error() {
+    echo -e "${RED}[ERROR]${NC} $1"
+}
+
+# Check if podman-compose is available
+if ! command -v podman-compose &> /dev/null; then
+    print_error "podman-compose is not installed or not in PATH"
+    exit 1
+fi
+
+# Start the environment
+print_status "Starting test environment..."
+podman-compose up -d
+
+# Wait for containers to be ready
+print_status "Waiting for containers to initialize..."
+sleep 10
+
+# Check if all containers are running
+print_status "Checking container status..."
+podman-compose ps
+
+# Set up initial default route for route-switcher (testing scenario only)
+# In production, this would be configured by the network admin
+print_status "Setting up initial default route via primary router..."
+podman-compose exec route-switcher ip route add default via 192.168.200.11 dev eth0
+
+# Verify network connectivity
+print_status "Testing initial connectivity..."
+
+# Test from route-switcher to target (should use default route via primary)
+print_status "Testing connectivity via primary router..."
+podman-compose exec route-switcher ping -c 3 192.168.202.100 || {
+    print_error "Primary connectivity test failed"
+    podman-compose down
+    exit 1
+}
+
+# Test specific interface connectivity
+print_status "Testing connectivity via secondary interface..."
+podman-compose exec route-switcher ping -c 3 -I eth1 192.168.202.100 || {
+    print_warning "Secondary interface connectivity test failed (might be expected initially)"
+}
+
+print_status "Initial connectivity tests passed!"
+
+# Show current routing table
+print_status "Current routing table in route-switcher:"
+podman-compose exec route-switcher ip route show
+
+echo
+print_warning "=== Starting Failover Test ==="
+print_status "Monitoring route-switcher logs (press Ctrl+C to stop monitoring)..."
+echo
+
+# Start monitoring logs in background
+podman-compose logs -f route-switcher &
+LOGS_PID=$!
+
+# Wait a bit for initial logs
+sleep 5
+
+print_status "Simulating primary router failure by shutting down eth0..."
+podman-compose exec primary-router ip link set eth0 down
+
+print_status "Waiting for failover to occur..."
+sleep 15
+
+# Check if failover happened
+print_status "Checking routing table after primary failure..."
+podman-compose exec route-switcher ip route show
+
+print_status "Testing connectivity after failover..."
+podman-compose exec route-switcher ping -c 3 192.168.202.100 || {
+    print_warning "Connectivity test after failover failed (this might be expected during transition)"
+}
+
+print_status "Restoring primary router..."
+podman-compose exec primary-router ip link set eth0 up
+
+print_status "Waiting for failback (should take ~60 seconds of stable connection)..."
+sleep 70
+
+print_status "Final routing table check:"
+podman-compose exec route-switcher ip route show
+
+print_status "Final connectivity test:"
+podman-compose exec route-switcher ping -c 3 192.168.202.100
+
+# Stop monitoring logs
+kill $LOGS_PID 2>/dev/null || true
+
+echo
+print_status "=== Test Complete ==="
+print_status "To stop the environment: podman-compose down"
+print_status "To view logs: podman-compose logs route-switcher"

scripts/verify-setup.sh

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+#!/bin/bash
+
+set -e
+
+echo "=== Quick Setup Verification ==="
+
+# Start containers
+echo "Starting containers..."
+podman-compose up -d
+
+# Wait for initialization
+echo "Waiting for containers..."
+sleep 10
+
+# Check status
+echo "Container status:"
+podman-compose ps
+
+# Set up initial route
+echo "Setting up initial default route..."
+podman-compose exec route-switcher ip route add default via 192.168.200.11 dev eth0
+
+# Show routing table
+echo "Route-switcher routing table:"
+podman-compose exec route-switcher ip route show
+
+# Test basic connectivity
+echo "Testing connectivity to target..."
+if podman-compose exec route-switcher ping -c 2 192.168.202.100; then
+    echo "✓ Connectivity test passed"
+else
+    echo "✗ Connectivity test failed"
+fi
+
+echo "Setup complete. Use './scripts/test-failover.sh' for full failover testing."