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ipchains

Software
Linux IP Firewalling Chains, normally called ipchains, is free software to control the packet filter or firewall capabilities in the 2.2 series of Linux kernels. It superseded ipfirewall, but was replaced by iptables in the 2.4 series. Unlike... Wikipedia
Final release: 1.3.10 / October 6, 2000; 23 years ago
Initial release: pre-1998; 26 years ago