KVM Windows VMs and losing network connectivity

[alain]

Hi IanCH,

I tried Realtek (rtl9139), but it is a 100 Mb (Fast Ethernet) interface only, so It was why I turned to VirtIO. Following your answer, I tried again rtl9139, and the interface also went down after a few seconds. I also tried to add a VLAN on this interface, there was none, but it failed to acquire an IP, as it is the defaukt VLAN on the trunk.

Regards

 

[alain]

In fact, this problem was due, for me, to a loop in the network, with a network cable connected from one switch to another with the aim to manage remotely the first switch. But it did not work. It was a little switch which has no OOB interface.
In the log, the were messages like this :
vmbr0: received packet on eth0 with own address as source address (addr:aa:bb:cc:dd:ee:ff, vlan:0)

So a loop in the network. Once I disconnected the faulty cable, the messages disappeared, and windows VM no more loose network connections.
What is strange, is that it did not seem to affect linux VM.