Being used to VMware Workstation, where NATing is a few GUI clicks away, I couldn't find a GUI way of configuring it in Hyper-V.
inside local outside hokey pokey; Turn yourself around
I don't mind the command line and actually prefer it sometimes. The PowerShell equivent didn't end up being too bad. Not like the first time doing Cisco NAT from the CLI.
Setting up NAT
The first code block is the generic commands from the Microsoft reference document the second one is what I used in my lab.
Create Internal vSwitch for NAT
New-VMSwitch -SwitchName "SwitchName" -SwitchType Internal
Configure the NAT gateway
New-NetIPAddress -IPAddress -PrefixLength -InterfaceIndex
Configure the NAT network
New-NetNat -Name -InternalIPInterfaceAddressPrefix
What I Used in My Lab
New-VMSwitch –SwitchName "NATvSwitch" –SwitchType Internal
New-NetIPAddress –IPAddress 220.127.116.11 -PrefixLength 24 -InterfaceAlias "vEthernet (NATSwitch)"
New-NetNat –Name myNATnetwork –InternalIPInterfaceAddres
There Can Be Only One
Windows (WinNAT) only supports one internal NAT subnet prefix, trying to create multiple NATs will place the system into an unknown state. (1)