Can anyone provide me with working ipchain example that allows http,ftp,dns, and ssh for internal and external(incoming requests) networks. Also, instruction of how to setup it up on Redhat7.1 will be greatly appreciated.

thanks
Patrick

there is a ton of documentation on line for ipchains. (linuxhq.org - firewall howto)
but this *may* get you started

set the POLICY:
ipchains -P input DENY
ipchains -P output DENY
ipchains -P forward DENY
---
set the rules

ipchains -A input -p tcp --dport 80 -j ACCEPT
ipchains -A input -p udp --dport 53 -j ACCEPT
ipchains -A input -p udp --dport 20 -j ACCEPT
ipchains -A input -p udp --dport 22 -j ACCEPT

etc, etc.
---
easiest thing to do is create a script called rc.firewall (make it executalbe : u+x also hope you know how to make a script. ie #!/bin/bash at top when your typing this into a file you created named rc.firewall) then you can edit the /etc/rc.d/rc.local file and put :
/etc/rc.d/rc.firewall
at the very bottom after everything else and wholla!

BUT
check this link out
i'm lazy and don't want to type anymore :P~

http://www.linux.com/howto/IPCHAINS-HOWTO-2.html