Using my machine as gateway...

I am using RH7.2 on linux box. I have two network card configured as

1. eth0 192.168.1.101
2. eth1 10.0.0.1
3. DSL Gateway 192.168.1.1

All my client machine are configured with IP range 10.0.0.*. Instead of
using proxy I want to use 10.0.0.1 as a gateway for all my machines to
access internet. How do I?

Thank you,

Tina...