I was doing some research about that but every explanation i get was really guffy. So The story is that i installed the redhat 9.0 with 2 ethernet cards and because of my links*ys router is defected i never bother me to install a linux router on my mashine. Please if somebody would be so nice end explain to me how to install Linux router step by step what to do exept the cabling "i know that". I am very sure that this information will help other users like me .
Thank you very much!!!

i am not quite understanding what you trying to do.
i assume that you want to add a new router since your old one was defected.
if that's the case, you don't need to configure the router in order for it to work.
you just do the " i know how to cable my net" part.

I think the poster is asking for help in turning a Linux box with 2 NICs into a router.

Try Smoothwall or ClarkConnect to see if they will meet the requirement. Otherwise, check out http://www.distrowatch.org for many more options.

YES you ware right ..i will check what i can do ......"the thing is i have 2 nicks and i want to have another maschine "windows based" running from the linux .......i know its posibile but i never bother my self with that untill now btw any extra help ?

Well, I know what you want to do, but not how to do it.
I suspect that the Smoothwall and ClarkConnect sites will have some good documentation. I'd start there.

to Gun
you could just use iptables to do that.
do a "man iptables" to see how to do it.

here is what i think i'll do . but not sure. however you could try & if it doesn't work. just delete it.

change line "net.ipv4.ip-forward=0" to "net.ipv4.ip-forward=1" by using gedit or other text editor.
$service network restart
$iptables stop
$iptables save
$iptables -P INPUT ACCEPT
$iptables -P OUTPUT ACCEPT
$iptables -P FORWARD DROP
$iptables -P FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED, RELATED -j ACCEPT
$iptables -A FORWARD -i eth1 -o eth0 -m state --state ESTABLISHED, RELATED -j ACCEPT
$iptables -t nat POSTROUTING -o eth0 -j MASQUERADE
$iptables -t nat POSTROUTING -o eth1 -j MASQUERADE
$service iptables save
$service iptables start