guest system network error with a unmanaged switch


New Member
Apr 23, 2022
I have a pve 7.4-1 host and two win10 guest system, they both work well when the host is directly connected to my router.
But when I add a unmanaged switch between the host and the router, all the guest system have network error while the host is still good to work. The guest system failed to ping my router.
After remove the switch everything is fine again, but I'm pretty sure that the switch is good because any other computer works well with it, even the pve host works well with it.
Do I miss any config or anything to work with a switch?
guest network setting: virtio=***,bridge=vmbr0,firewall=1; no vlan

proxmox-ve: 7.4-1 (running kernel: 5.15.102-1-pve)
pve-manager: 7.4-3 (running version: 7.4-3/9002ab8a)
pve-kernel-5.15: 7.3-3
pve-kernel-5.15.102-1-pve: 5.15.102-1


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