[SOLVED] Unable to connect to network after restart

[molisani]

I recently (a week or two ago) upgraded from Proxmox 7 to 8, and I believe I've restarted successfully at least once but now I'm no longer sure. I was dealing with some other issues with a container that wouldn't terminate and I issued a hard shutoff of the entire machine and then restarted it. When I brought it back up, I was not able to access the web UI. The machine did not appear on my network at all, but I was able to log into the machine directly (via a remote access controller). I noticed that there was some problem with the network interfaces, and in the logs for my machine (journalctl) I was getting a lot of bridge 'vmbr0' does not exist.

I found a lot of other guides/threads about issues similar to this, that all describe fixing the /etc/network/interfaces file. However, they all mention (as does the v8 upgrade docs) that network interface names may change, but as far as I can tell all of the interfaces mentioned in /etc/network/interfaces still exist in ip a. I normally use eth2/eno3 as the active connection, and I have it set as 192.168.1.125 on my network (bound MAC address in my router's DHCP).





I hadn't unplugged the ethernet cable when I restarted it the first time, and I've since re-plugged it in. The ethernet port is blinking with activity of some kind (my knowledge is admittedly limited) but otherwise it's not working.

Is this purely a configuration issue, or should I start investigating a hardware malfunction?

 

[sbechard]

your "ip a" output is showing all interfaces are DOWN, however, they are showing altname for all interfaces too.

Have you tried updating the /etc/network/interfaces with the altname instead



and restarting the host or networking?

 

[molisani]

Yes I've tried replacing all of those network interfaces in the /etc/network/interfaces file with their altnames (ex: replace eno3 with enp1s0f2) with no success after a restart.

I also noticed some other threads recommending ifup or ifreload commands to restart networking, but whenever I run those I get Error: Another instance of this program is already running.

 

[sbechard]

what is the output of
ifquery -c -a

If editing from the console, normally just this to restart the networking after changes to /etc/network/interfaces

systemctl restart networking.service

 

[molisani]

Very strange, this occurred after I plugged in two external optical drives to a USB hub. I couldn't imagine how those interacted negatively with the startup, especially for the networking, but I've removed them and everything is working as expected again...

(Thanks for the assistance nonetheless)