how to configure Gateway func between 2 ifaces, one with static IP, other with DHCP

Hi,

I have a private network on 10.0.2.x network on one hand (all linux
boxes running CentOS4.6) -- all of these hosts have a single LAN card,
barring 1, called "gatekeeper" which has 2. On "gatekeeper" one of the
interfaces has the IP=10.0.2.254 (gateway for all other hosts on the
private network), and the other interface is configured for DHCP.
Also, I've setup DynDNS on this machine s.t. I could reach this
machine over the Dynamic IP from anywhere. The interface with DHCP IP,
allows it to connect to the Internet via a firewall (& http proxy
etc.). I also have a network which is also assigned a dynamic IP via
DHCP, which can connect to the internet, and also to "gatekeeper". I'd
like to know, how I could configure "gatekeeper" to act as a Gateway
for the 10.0.2.x private LAN machines, s.t. they can also be reached
from the internet (via a middle-hope on "gatekeeper") and vice-versa ?

The intended topology is available in this image-link here (http://
c.imagehost.org/0781/topo.gif)

thanks & regards,
bani
.

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