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Originally Posted by ephemera
effective implementation of a firewall requires good knowledge of tcp/ip.
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Exactly. IMO, that's 95% of the battle. Once your tcp / udp / icmp / ip knowledge is cemented, it is only a matter of figuring out how to implement the ruleset you want using <packet_filtering_facility_here>.
And that's where documentation (e.g. the FAQ cited above) come into play.
