ipchains is the user-space portion of the Linux packet filtering firewall code, which was introduced into the mainstream kernel in version 2.2. Included is an extensive HOWTO, man pages and the ipchains source.
You can download it from the following link: https://packetstormsecurity.com/files/download/23256/ipchains-1.3.10.tar.gz
Source: https://packetstormsecurity.com/files/23256/ipchains-1.3.10.tar.gz.html