Calling on the hive mind: networking issue from hell

Hi,

so I have a small home lab cluster of 3 PVE nodes and one additional PBS. And I have the following networks (each on separate NICs/cables/switches):

- Management
- Corosync
- Ceph
- Backup

The PVE nodes are connected to all networks. The PBS in only connected to Management and Backup.

All PVE nodes see each other on all networks and can see the PBS both on the management network as well as on the backup network.

Recently I replaced one of the PVE nodes with newer hardware. This new...

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