No Network / Internet after Reboot!

I

ITCowboy

New Member
Jun 17, 2025
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I recently upgraded from 8.x PVE to 9.x PVE and during the upgrade it failed (cant remember the error message) and it will not find internet on reboot. no apps will load and no services will install.

I can get the network to boot manually using the manual method of brtcl and assigning ip address but EVERYTIME the server has to update or power outage I have to perform the same steps to just get it online!! HELP!!!
 
Could you post a full journal of a boot where the problem occurred. If it happens every time, then the journal of the current boot should be sufficient:

Code: 
journalctl -b | gzip > journal.txt.gz
 
Could you please edit the subject to let me recognize the type of your problem?

You seem have tailscale installed on the host. I would try to disable/mask all unusual "addons" and test if this changes anything.

Sorry for not being more helpful, but... "Oh SHIT" is definitely not helpful too :-(
 
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Reactions: LnxBil and Johannes S
Additionally to tailscale, docker is installed as well - which is known to interfere with host networking as well. vmbr0 doesn't seem to get created by ifupdown2 on boot, which is where your network configuration resides - couldn't find any reason why in the journal. You might want to look into the logs ifupdown2 generates on boot.
 
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can you point to me what log I should be looking at? and I just tried to reinstall ifupdown2 and it stated that it was already installed....
 
Assuming they are referring to ifupdown2.debug.log you can use this to view the newest
Bash: 
cat $(ls -t /var/log/ifupdown2/*/*.log | head -n1)
And this to find others
Bash: 
ls -lht /var/log/ifupdown2/*/*.log
# Or
find /var/log/ifupdown2/ -type f -name "*.log" -ls
 
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