A rollback script of wan2lan.sh (untested for now)

wan2lan_rollback.sh

#!/bin/bash
set -e

echo "🧹 Removing custom NetworkManager profile for eth0..."
sudo nmcli connection delete local-eth0 || echo "No connection named 'local-eth0' found."

echo "♻️ Restoring original dnsmasq configuration..."
if [ -f /etc/dnsmasq.conf.backup ]; then
  sudo mv /etc/dnsmasq.conf.backup /etc/dnsmasq.conf
else
  echo "No dnsmasq.conf.backup found, skipping restore."
fi

echo "🔥 Flushing NAT rules and saving empty rules..."
sudo iptables -t nat -F
sudo iptables-save | sudo tee /etc/iptables/rules.v4 > /dev/null

echo "🌐 Disabling IP forwarding..."
sudo sed -i '/^net.ipv4.ip_forward=1/d' /etc/sysctl.conf
sudo sysctl -p

echo "🔁 Restarting services..."
sudo systemctl restart NetworkManager
sudo systemctl restart dnsmasq

echo "✅ Rollback complete. Your system is restored to its previous state."