[CentOS] Packet routing diagram (was: Blocking an IP address both as source and destination)

[Kenneth Porter]

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_iptables#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?