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DNAT Routing Problem

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I'm trying to get a better understanding of how iptables works. When I log packets, I'm seeing what I would expect. Is this graphic correct for ASUS/Merlin?

https://en.wikipedia.org/wiki/Iptables#/media/File:Netfilter-packet-flow.svg

I wouldn't know, as I'm no kernel expert.

Personally, I usually refer to the following chart for reference purposes (not as complete, but usually enough for my needs):

image2070.gif
 

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