rcf (aka rc.firewall) is an ipchains-based firewall with support for
over 50 network service modules (including vtun, dhcp, nfs, smb,
napster, proxies, online games, etc.), masquerading, port forwarding,
and ip accounting.  All services are self-contained modules which can be
prioritized in the ipchains stack.  Protections include spoofing, stuffed
routing/masqerading, DoS, smurf attacks, outgoing port scans, and many
more. rcf also supports unlimited public, private (masqu'ed), dmz, and
mz (non-masqu'ed) interface and their subnets.  Access rules are defined
per interface and dmz/mz server "clusters".  rcf is compatible with most
of GNU/*/Linux distributions.

• Dmitry V. Levin

• rcf