[VBox-users] vlan trunking and promiscuous mode

[Marco M. <mm...@do...>]

Hello!

I run Virtualbox on Debian with a network bridge to a real ethernet
interface that is a trunk (transports multiple vlans with tags).

My goal is to bring that trunk into the VM, so one bridge exists to the
trunk interface and the VM will create subinterfaces. Although, the
bridge doesn't detect that those subinterfaces have multiple MAC
addresses and doesn't forward ethernet traffic to them unless I enable
promiscuous mode in the VM (e.g. start sniffing using tcpdump). If I
disable promiscuous mode in the VM, the traffic with dst of the
subinterfaces with different MAC will stop.

How do I configure that properly, so the bridge behaves like a real
bridge that ust learns which MAC addresses are connected to which port
and don't filter.

-- 
kind regards
Marco

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