Disconnecting PVE host without disconnecting VMs

Jan 26, 2022

I have a strange problem with Proxmox 7 servers running at Hetzner using their vSwitch. I have one server that is running a pfSense that is used as the gateway to the internet and two Proxmox 7 servers that are connected to this pfSense using a VLAN on Hetzners vSwitch configuration.

Now the management IP of those Proxmox servers is unreachable for about half a minute several times a day. Interestingly though the VMs that use the very same bridge are reachable all the time.

Network configuration is like this:

auto lo
iface lo inet loopback

iface enp4s0 inet manual

iface enp4s0.4020 inet manual
mtu 1400

auto vmbr0
iface vmbr0 inet static
bridge-ports enp4s0.4020
bridge-stp off
bridge-fd 0
#Test Network

As I said vmbr0 is the same bridge the VMs are attached to.

Any hints are welcome.

Cheers Frank


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