Thank you again. I'm not using openvswitch. And I have already set "stable" names for my NICs (en0, en1 etc) so they match across all nodes.
For now, I took the jump and installed the 6.14 kernel. Will keep posted if there is any effect either way.
@TErxleben not sure I understand the question, but, what I noticed was that the entries in the kernel log for the interfaces that were entering/exiting promiscuous mode only corresponded to the VMs that were powered off at the time the backups started (see OP). For example,
tap100i0, fwpr100p0...
My backups (to PBS) are scheduled to run every night at 1:30am. For the last few nights, I get a warning from my Unifi switch saying that "multiple devices are using IP address 192.168.20.51..." which is the IP assigned to my bare metal PVE node. Nothing special about the node, it's a Mini NUC...
I have a similar issue, and was also was running a WatchYourLan instance in a docker container. I ended up assigning a dedicated NIC for WYL to run in so it didn't need to put my "main" NIC into promisc mode. That quieted down the logs some, but...
I am still seeing stuff like this every day...
I tried this before but hit a wall, I don't think the Synology kernel supports this, see below for reference
https://github.com/bcleonard/proxmox-qdevice/issues/10#issuecomment-2094267851
https://github.com/bcleonard/proxmox-qdevice/issues/2
Ah ha! Thanks for spotting that. You are right of course.
This fixed it:
root@nas:~# chmod 0755 /volume1/pbs
root@nas:~# chown 34:34 /volume1/pbs
root@pbs:~# proxmox-backup-client benchmark --repository syno-pbs
Password for "root@pam": *******************
Uploaded 372 chunks in 5 seconds...
My datastore is mounted via NFS, I don't have a /host dir in there at all (?)
root@pbs:/# find / -type d -name host
/usr/lib/modules/6.8.12-8-pve/kernel/drivers/ufs/host
/usr/lib/modules/6.8.12-8-pve/kernel/drivers/memstick/host
/usr/lib/modules/6.8.12-8-pve/kernel/drivers/mmc/host...