Multi gateway routing with iptables and iproute2 « khax.net. Notes on multi gateway routing with iptables and iproute2, suggestions and corrections gladly accepted.
My notes may be incomplete or just plain wrong, I pieced them together after getting it working. Running on Ubuntu-9.10 with two internet connections ppp0 and ppp1 both with static IP’s from two different internet providers in Australia (iiNet and Internode). Preperation: Extra ip route tables per gateway. Add tables to /etc/iproute2/rt_tables.