proxmox host lost internet overnight


New Member
Nov 4, 2023
Hiya folks,

Long time user, first time caller.

Overnight last night my proxmox host seems to have lost connection to the outside world.

- It uses wired ethernet which I've verified on a laptop is fine.
- It can ping, by IP, the VM's it hosts
- It cannot ping other devices on my home network
- It cannot ping anything external
- I'm, obviously, unable to access the web UI from my usual desktop machine
- I can connect a monitor/keyboard to the proxmox machine and access the interface from there

This machine has been up and running for a few years with few problems, so I think it's less likely to be config and more like to be hardware.. but.. any suggestions on debug steps first? What logs would help?

I ran into something similar and it has to do with my gateway setting being corrupt. It requires me to issue the following command after every reboot, basically replacing the default gateway with the same settings my default gateway was already using:
ip route replace default via 192.168.x.x dev vmbr0
where x.x is the IP address of my server. I don't know why I have to issue this after every reboot, I am sure it is cached somewhere and the cache is corrupt, sadly I just can't seem to find it.


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