Im surfing this forum about half hour and didn't find anything about how to configure linux to be router. Have two ethernet and two wireless networks and leased line access to internet. I would like to configure linux to route those four networks to internet and to be available between them. I heard that this is possible with linux but didn't find much about this on google. Found LRP but it is to old and I would like to use that computer to be HTTP, FTP, DNS server also. I know that this is huge subject for explaining here on forum and I would like just to know is it possible and if is some links to manuals how to do it.
Thanks

Firewall/Router
iptablesrocks.org
netfilter.org

DNS
orielly.com

FTP
Use the proftpd guide here under "Linux Tutorials"

httpd / Apache
Apache is really easy. There might be a guide here, but the httpd.conf is incredibly easy to work through.

Everything your asking to do is very do-able. You'll have to verify that your got the correct packages installed

iptables for routing
BIND or DNSMASQ for your DNS service
ProFTPd for FTP
Apache for http

Thanks for answer. Im novice to Linux but have CCNA cert. so have basic knowledge about networks. Im trying to save some bucks installing that router. I found a lot of readme files on netfilter.org and they seems to complicated because going to deep in security. Now I learning what is compiling kernel, but basicly what I need to do is to connect four network cards to route trafic betwen them and to fifth port that leads to internet. No need for firewall, filters and so on of any kind. It would be great if that is possible with few simple lines