Do you think your issue is related to this https://forum.proxmox.com/threads/kvm-windows-vms-and-losing-network-connectivity.46763/?
It sounds similar, other than the fact that you've experienced it on Linux Guests and not just Windows
Update from my environment.
OPenVswitch
Proxmox 6.1-7
Virtio Drivers 173
I just experienced the disconnect issue a couple more times yesterday with a Windows Server 2019 VM. I notice it mostly that *sometimes* on booting up from a reboot the NIC will fail to pass traffic. It seems to happen on...
Resurrecting an old thread here, but I'm experiencing the same issue on 6.0 using VirtIO 171 drivers. I just updated all my guests to the VirtIO 173 drivers so I will pay attention if it happens again. Like mholoubek, I believe I've also seen the issue with a windows guest using e1000. I will...
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