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Old 04-25-2011, 10:20 PM
Kenneth Porter
Default Packet routing diagram (was: Blocking an IP address both as source and destination)

There's a number of diagrams around the Internet illustrating the path
packets take through the Linux kernel, including the various firewall
modules, that's quite helpful in understanding which rules should go in
which table.

Here's one that's not bad:

<http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptable s#Figure_14-1_Iptables_Packet_Flow_Diagram>

The box labeled "Local Processing of Data" is where packets that are
created by the firewall's applications originate.

Does anyone have a better diagram? How about one that shows the policy
routing system?
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