ipchains is the user-space portion of the new Linux packet filter code, which was introduced into the mainstream kernel in version 2.1.102. Included is an extensive HOWTO, man pages and the ipchains source.
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Added --line-numbers, fixed --delete-chains (not --delete) in
help, libipfwc now gives "" target for acct rules, so we turn it into
"-" in print_firewall, fixed parsing of `--sport ! 53'; same as `!
--sport 53' and added enabling forward warning.
