Книга: Iptables Tutorial 1.2.2

OUTPUT chain

OUTPUT chain

Since I know that there is pretty much no one but me using this box which is partially used as a Firewall and a workstation currently, I allow almost everything that goes out from it that has a source address $LOCALHOST_IP, $LAN_IP or $STATIC_IP. Everything else might be spoofed in some fashion, even though I doubt anyone that I know would do it on my box. Last of all we log everything that gets dropped. If it does get dropped, we will most definitely want to know about it so we may take action against the problem. Either it is a nasty error, or it is a weird packet that is spoofed. Finally we DROP the packet in the default policy.

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