I have been using Virtualbox for quite long time at my home office. We just moved to new place, where I setup the network bit differently than before and now the Virtualbox (latest, 6.1.26) behaves bit oddly, ie. depending which NIC I use and where it is connected, there is either constant 4.2 Mbps incoming traffic on the NIC, with the other there is no such traffic.
The topology is bit like this (all connections are cables)
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PC --------> Dir655 ----- > Switch (Netgear G108) ---------+
| +-------------- Asus GT AC5300 --> modem --> fiber .... WORLD
+------------------ Switch (Netgear G108) ------------------+
If I make in VirtualBox the network connection to be bridged adapter via the Marvell 10G or the 1G, when it is connected directly to the Switch, there is constant 4.2 Mbps traffic coming in (seen via Task Manager's performance tab). If I then change the bridge to go through the NIC, which goes via Dir655, there is no such traffic coming in.
Edit: And in both configurations, the connections work, but for the "odd one", there is constant extra 4.2 Mbps.
Any idea, why this would be? And how this situation could be remedied.
Cheers.