Score:0

network does not work for VM after a while, only resolves after changing MAC

dk flag

I have installed pfSense as a KVM guest in a Debian 11 host using libvirt. The host has two interfaces. One is attached to the VM using macVLAN driver, and serves as pfSense's WAN interface. The other is attached to a linux bridge, and serves the LAN (thus the linux bridge has three ports: the actual physical NIC, a tap interface for VM, and one for the host).

Everything works fine at first. However, after a day or two, the VM's tap interface in the linux bridge (LAN side) becomes unresponsive. I can access the host, but not the VM, even after destroying/starting it. The only way to make it work again is to change the MAC address. Then, the VM becomes accessible, until one/two days. I think the amount of network load also affects the timing. In case of very low load, it takes much longer for the VM's tap interface to become unresponsive.

update: I have also tested OVS bridge, and the results are exactly the same.

Brian avatar
gq flag
This sounds like a bug. You should report it.
Mustafa Mohiuodin avatar
dk flag
Yes it is. However, I have not deployed any special configuration. Just basic libvirt, linux bridge/OVS, and pfSense. There are pretty mature ones. It is very unexpected to be a bug.
I sit in a Tesla and translated this thread with Ai:

mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.