user_data_nat.txt

#!
cat >> /etc/rc.local <<EOF
route del -net 0.0.0.0 netmask 0.0.0.0 dev eth0
route add -net 0.0.0.0 netmask 0.0.0.0 dev eth0 metric 20000 gateway 10.8.0.1
iptables -t nat -A POSTROUTING -s 10.8.0.0/16 -o eth1 -j MASQUERADE
EOF

reboot