#!/bin/bash
read -p "Qual a interface de saída para a internet? " IFACE
nft add table ip nat
nft add chain ip nat postrouting { type nat hook postrouting priority 100 \; }
if ! nft list chain ip nat postrouting | grep -q "oifname \"$IFACE\" masquerade"; then
  nft add rule ip nat postrouting oifname "$IFACE" masquerade
fi
sysctl -w net.ipv4.ip_forward=1