Hello, I installed a computer with Debian 12, initially with only one active Ethernet interface. I also activated a netfilter configuration for the interface. After this all worked successfully, I put the second Ethernet interface into operation, not in normal operation as a single interface, but using the bonding LACP functionality together with the first interface. I then changed the name of the interface in the Netfilter configuration. Rebooted, and the netfilter rules no longer worked, but you can also say that they worked too well, because no IP traffic went through at all (everything works with deactivated netfilter).
After some trial and error, I was at a loss and simply copied the relevant files from a computer where LACP works in conjunction with Netfilter. I changed the IP address in /etc/systemd/network/bond0.conf, also in the Netfilter configuration, rebooted - it still didn't work. The only difference between the two machines: The one where it works is running Debian 11, the other Debian 12, so there must have been a significant change between bullseye and bookworm. Does anyone have an idea? Regards Christoph
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