[SOLVED] No network connectivity with HyperV

[LegendaryIT]

HI

I installed HyperV on a VM running on my proxmox server. Now I have the issue, that as soon as I create an external virtual switch connected to my network interface, the network interface has no connectivity anymore. I can't reach any other devices in the same network anymore, which I could before I created the virtual switch and I can reach them again, as soon as I delete that switch.
I enabled nested virtualization, disabled any firewalls, and disabled the MAC filter on the VM.
Has anybody an idea what the problem could be?

 

[bobmc]

can you post your network config (etc/network/interfaces)

 

[LegendaryIT]

This is the network config of the proxmox server and the vm.

 

[Falk R.]

What is the network configuration in your VM?

 

[LegendaryIT]

It is on DHCP, I tried with a static ip, not luck either. It works perfectly as long as I have no externe network switch from HyperV bound to it. As soon as I set up the externe Switch in HyperV I don't have any connectivity anymore.

 

[Falk R.]

how is the virtual switch configured, especially how is the virtual ethernet adapter configured?

 

[LegendaryIT]

I found the issue. 1. I had to change under Hardware of the VM the Machine to the newest version and second I had to change set the OS Type in the VM Options to Microsoft Windows 10/2016/2019. Now it works.

 

[LegendaryIT]

I noticed it also needs Virtual Network Interface Type: virtio , Realtek RTL8139 does not work.