Problem on setup Linux Router

Question

I have tried to make Linux(Ubuntu) as a router but it gets failed. My objective is to create a Linux router then have to share two broadband connection.So How to do it?

Answer 1

Docs at lartc.org contain this use case.

Answer 2

The shortest answer: Look for a tutorial.

The short answer:

echo -n "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

This question is probably better off next door at http://www.serverfault.com/.