Issue with external network connectivity for all VMs

[DiffieHM]

Just started exploring Proxmox. Did not have a spare physical machine, so I have installed Proxmox on Hyper-V.

I have created several VMs (Windows/Linux) and those VMs have their connectivity working correctly (as I can for instance ping the host from the VMs). But I cannot reach anything from the VMs outside the host.

All physical/virtual machines are on the same single subnet, no VLANs configured or anything. Single physical NIC on Hyper-V host.

Host network config:

I have went through all the host / VM network settings, but nothing stands out for me that could be wrong. Any idea where to look?

 

[Tobias.F]

Any idea where to look?

Yes. In Hyper-V under extended properties of the network adapter of the VM you need to activate:
activate spoofing of MAC addresses

 

[DiffieHM]

Yes. In Hyper-V under extended properties of the network adapter of the VM you need to activate:
activate spoofing of MAC addresses

Yes, that did the trick. Thanks!