[SOLVED] weird network issue after update to 7 - cannot update - system time - ceph time

[damon1]

Hi Guys,

any idea what might be causing this



I think it is related to my previous post.

I assume something is weird on my network settings

thanks
damon

 

[damon1]

I believe I have found the cause for this and the solution.

during the upgrade to 7 it lists a possible problem, in that the MAC address might change for the Linux Bridge
(total mumbo Jumbo to me)

However when I looked at the one node which did still work using "ip address" in the shell, I see this



Note the MAC address of the Network Card is the same as the MAC address of the Linux Bridge vmbr0:

On a node which doesn't work then MAC address for the Network Card is the same but for the bridge it is different.



Note one ends in 33:88 and the other ends in 3a:2e

So to fix this you need to go to your router. (IMHO: I found it easier than trying to find where and what I was looking for in the linux system.)

On the router find your BIND IP TO MAC section and change the MAC from the one shown in the Network card section ( ends in 33:88) to the Bridge MAC address (ends in 3a:2e)

Migrate all the VM's to another node (if they are critical)
Reboot this node
Migrate the VM's back.

problem solved

Thanks Damon

 

[Stoiko Ivanov]

I believe I have found the cause for this and the solution.

during the upgrade to 7 it lists a possible problem, in that the MAC address might change for the Linux Bridge
(total mumbo Jumbo to me)

sounds correct - the change got introduced with the newer systemd-version used in debian bullseye - we tried to mention that a few times in the upgrade guide:
https://pve.proxmox.com/wiki/Upgrade_from_6.x_to_7.0#Check_Linux_Network_Bridge_MAC

Glad you found the solution yourself!