On 3/14/24 12:46, Uwe B wrote:


So I'm still puzzled how to get rid of the DROP in the rplog chain and if it would even be a good idea to do so.

well, the mystery is solved. Triggered by the "anti-spoofing" description for the rpfilter option in /etc/shorewall6/interfaces:

rpfilter
Added in Shorewall 4.5.7. This is an anti-spoofing measure that requires the 'RPFilter Match' capability in your iptables and kernel. It provides a more efficient alternative to the sfilter option below. It performs a function similar to routefilter (see above) but works with Multi-ISP configurations that do not use balanced routes.

I had this in the interfaces file:
...
net AMS2 detect nosmurfs,tcpflags,rpfilter,forward=1
...

without the rpfilter, everything works as designed.
Now I only have the issue with the strange logfile location.

Kind regards,

Uwe


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