ipchains-firewall is an easily-configurable shell script to establish masquerading and firewalling rules using ipchains. The package contains a script to establish firewalling for a single machine connected to the network without masquerading, a script to establish firewalling for a system acting as a router routing to non-private IP space, a script to establish firewalling and masquerading for a system acting as a router routing to private IP address space, and one to establish firewalling and masquerading for a system acting as a router, routing to multiple RFC1918 subnets over multiple interfaces. The distribution also includes a copy of midentd v1.6, to enable identd over the masqueraded network.
You can download it from the following link: https://packetstormsecurity.com/files/download/23763/ipchains-firewall-1.7.3.tar.gz
Source: https://packetstormsecurity.com/files/23763/ipchains-firewall-1.7.3.tar.gz.html