Can't figure out why my FreeBSD box isn't forwarding traffic to a bridge interface when traffic comes on lagg0 and has a 802.1Q tag.

Turned out, the onboard NIC of my server is not supported well on FreeBSD. After installing a new network card all packets are forwarded to the right bridge

That was not correct. The problem was instead that I had an IP address configured directly in the default VLAN 1 on the interface. Seems like FreeBSD is not able to have an IP address on the interface which should act as a trunk port.

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Anyway, second network card solved the problem, since I have now an dedicated card for tagged traffic 🤣

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