unless i'm wrong, the new kernels don't have 'built-in' support for ipchains. which isn't to say you can't use ipchains with the new 2.4 kernels...but you'll probably need to build a new kernel with ipchains support or try loading ipchains as a module.
and, i would recommend that you get acquainted with netfilter...which uses iptables. shane chen has some decent (slightly outdated) stuff at: www.knowplace.org - he wrote some nice how-to's on building iptables firewalls. it's a good start. good luck and if you want to try, load ipchains as a module and see what you get - i'm not sure what will happen since i'm a big debian user. as root, modprobe ipchains ; insmod ipchains -jeff
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