#!/bin/bash
# Setup NAT on Pi 5 (head-vixy.local) to give BBB internet access
# Run this on the Pi

set -e

echo "🦊 Setting up NAT for BBB..."

# Enable IP forwarding
sudo sysctl -w net.ipv4.ip_forward=1
echo "net.ipv4.ip_forward=1" | sudo tee -a /etc/sysctl.conf

# Setup NAT rules
sudo iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT

# Make persistent (requires iptables-persistent)
sudo apt install -y iptables-persistent
sudo netfilter-persistent save

echo "✅ NAT configured!"
echo "   Pi (wlan0) -> BBB (eth0 192.168.5.2)"