can you please not ask the same question more than once. starting a new thread for this problem is fine, i would say you shouldn't ask it in that other one as well, it can get confusing.
well ipchains is OLD and deprecated now in favour of iptables (since the 2.4.x kernels came into use) althought you can still use ipchains if you really want, it's better to keep up to date. like i said in my other reply, i recommend firestarter for setting up a firewall. all these applications generally only act as a front end to iptables or ipchains, so the fundamentl concept is the same.