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On 19/05/22 21:06, Alwin Antreich wrote:
Have you seen this section in the upgrade guide?
https://pve.proxmox.com/wiki/Upgrade_from_6.x_to_7.0#Linux_Bridge_MAC-Address_Change

Yes, I read that one, and it got me some headache, but not in these server. Thanks anyway for the answer.

The upgrade was done fine for all the server of the cluster (the external one was installed directly with 7), their machine-id are all different and network communication between hosts has no problems.

In our case, we had an identical machine-id on two of our hosts and that killed 
the network for both.

The problem I got is just between this specific host and the VM it is hosting (also between VM on the same network in other hosts and the ones inside this server, but that just because these are unreachable from the host itself).

Simone
--
Simone Piccardi                                 Truelite Srl
[email protected] (email/jabber)             Via Monferrato, 6
Tel. +39-347-1032433                            50142 Firenze
http://www.truelite.it                          Tel. +39-055-7879597


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