[SOLVED] No network connectivity with HyperV

LegendaryIT

New Member
Mar 9, 2022
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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?
 
This is the network config of the proxmox server and the vm.
 

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

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