Association between virtual ethernet and virtual switch

You’ve just created couple of internal network switches in your Hyper-V Manager. Or you’ve just installed Docker for Windows and played with it a little. Now want to create NAT to allow your fresh new containers and/or virtual machines to have access to the Internet. Unfortunately there is no simple way to say which of the HNS Internal NIC adapters associated with proper vSwitch.

I’ve created simple script to show associations between virtual Ethernet interface and vSwitch. Here it is:

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$net_adapters = Get-NetAdapter
foreach($ethernet_port in gwmi -Namespace Root\Virtualization\V2 -Class Msvm_InternalEthernetPort){
	$endpoint_physical = gwmi -Namespace Root\Virtualization\V2 -Query "ASSOCIATORS OF {$ethernet_port} WHERE ResultClass=Msvm_LANEndpoint AssocClass=Msvm_EthernetDeviceSAPImplementation"
	$endpoint_virtual = gwmi -Namespace Root\Virtualization\V2 -Query "ASSOCIATORS OF {$endpoint_physical} where ResultClass=Msvm_LANEndpoint assocclass=Msvm_ActiveConnection"
	$ethernetswitchport = gwmi -Namespace Root\Virtualization\V2 -Query "ASSOCIATORS OF {$endpoint_virtual}  WHERE ResultClass=Msvm_EthernetSwitchPort AssocClass=Msvm_EthernetDeviceSAPImplementation"
	$vswitch = gwmi -Namespace Root\Virtualization\V2 -Query "ASSOCIATORS OF {$ethernetswitchport} WHERE ResultClass=Msvm_VirtualEthernetSwitch"
	
	$net_adapter = $net_adapters | ?{($_).MacAddress -replace '-','' -eq $ethernet_port.PermanentAddress}
	Write-Host "Adapter:" $net_adapter.Name 
	Write-Host "Switch:" $vswitch.ElementName
	Write-Host
}