[K12OSN] [OT]router howto

[Dale Sykora]

This is slightly off topic, but I thought I'd ask as this list is 
usually very helpful.  I am having trouble trying to setup a generic fc4 
or centos4 into a network router.  eth0 goes out to the internet and 
eth1 goes to the internal network.  Internal systems can get an ip from 
the server and can ping the server, but they cannot ping anything on the 
internet such as yahoo.com.  I tried enabling ip_forward in /etc/sysctl 
and tried comparing settings with a SME server, but I can't figure out 
what I am missing.  Any suggestions on what I should check next?

Thanks,

Dale