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asuswrt simple port forward (router in DMZ) not working

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On a relatively simple remote network I'm trying to forward to one service on an internal host, but it is strangely not working.

The setup is like this:

  1. modem defines internal asuswrt merlin router as DMZ on 192.168.178.178
  2. the asuswrt router in the DMZ defines a normal "Virtual Server/Port Forwarding" to :16822 -> 192.168.1.131:22 (its eth0 is on 192.168.178.178 and br0 on 192.168.1.1)
  3. the expectation is that I can access ssh on 192.168.1.131 via externalip:16822 but it doesn't work
  4. however, simply configuring external ssh to the asus router itself works without problems (as does opening the web interface)
  5. ssh-ing to the asus router from externally first and from there ssh-ing to 192.168.1.131:22 works fine

I turned off NAT acceleration (which I read somewhere might cause issues), but that didn't make a difference.

What am I missing? How can I debug what is going wrong?

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