Implement Split Tunnel on Windows Client

Zyxel_Kevin

Symptom:

By default, when using the L2TP service, clients will go through a Full Tunnel. However, In certain situations, you may not want all traffic to go through the VPN tunnel

Workaround:

1)Find the L2TP profiles in Control Panel->Network and Internet->Network Connections. Right-click it and go to properties > Networking > IPv4 > Properties > advanced to uncheck “Use default gateway on remote network” and uncheck “Use default gateway on remote network”

2)Open powershell and perform the following command:

Add-VpnConnectionRoute -ConnectionName "Your VPN profile name" -DestinationPrefix "X.X.X.X/X” -PassThru

For example: You VPN profile name is “Zyxel_Win_612”, Destination subnet: 192.168.0.0/24.

Please perform:

Add-VpnConnectionRoute -ConnectionName "Zyxel_Win_612" -DestinationPrefix "192.168.0.0/24" –PassThru

If you’d like to remove it.
Remove-VpnConnectionRoute -ConnectionName "Zyxel_Win_612" -DestinationPrefix "192.168.0.0/24" –PassThru
Note: You can use route add command as well, but you need to know your client address before you added it.