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FixWsl2

Workaround for WSL2 being cut off from network when connected to a VPN. WSL2 is a seperate VM with its own network adapter so connecting to a VPN in the host breaks internet connectivity. Sigh.

This PowerShell script changes the priority of the adapters so the WSL2 NIC gets out first

Running

./Fix-Wsl2.ps1 parameters

Parameter Description
-Fix fix WSL2 and break other stuff, maybe
-UnFix set things back
-VpnAdapter Name Match your VPN adapter. The default is for GlobalProtect
-Whatif Get a dump of the current adapters and what would be done with the above options

Installation

This script requires the Join-Object PowerShell Module, install that with

Install-Module -Name Join-Object

Examples

Help

❯ Fix-Wsl2.ps1 -Help
WSL2 is a seperate VM with its own network adapter so connecting to a VPN breaks internet connectivity
This script changes the priority of the adapters so the WSL2 NIC gets out first

Parameters:
  -Fix              fix WSL2 and break other stuff
  -UnFix            set things back
  -VpnAdapter Name  match your VPN adapter. The default is for GlobalProtect
  -Whatif           get a dump of the current adapters and what would be done with the above options

Requires Join-Object Module, install with:
   Install-Module -Name Join-Object



Current Interface Metrics:

Name            InterfaceDescription                InterfaceAlias  InterfaceMetric
----            --------------------                --------------  ---------------
vEthernet (WSL) Hyper-V Virtual Ethernet Adapter #3 vEthernet (WSL)            5000
Ethernet 5      PANGP Virtual Ethernet Adapter #2   Ethernet 5                    1

What If

Will change Interface Metrics as follows:
    vEthernet (WSL) = 1
    PANGP Virtual Ethernet Adapter #2  = 6000

On:

Name            InterfaceDescription                InterfaceAlias  InterfaceMetric
----            --------------------                --------------  ---------------
vEthernet (WSL) Hyper-V Virtual Ethernet Adapter #3 vEthernet (WSL)               1
Ethernet 5      PANGP Virtual Ethernet Adapter #2   Ethernet 5                 6000

Fix

❯ Fix-Wsl2.ps1 -Fix

Name            InterfaceDescription                InterfaceAlias  InterfaceMetric
----            --------------------                --------------  ---------------
vEthernet (WSL) Hyper-V Virtual Ethernet Adapter #3 vEthernet (WSL)               1
Ethernet 5      PANGP Virtual Ethernet Adapter #2   Ethernet 5                 6000

Unfix

❯ Fix-Wsl2.ps1 -UnFix

Name            InterfaceDescription                InterfaceAlias  InterfaceMetric
----            --------------------                --------------  ---------------
vEthernet (WSL) Hyper-V Virtual Ethernet Adapter #3 vEthernet (WSL)            5000
Ethernet 5      PANGP Virtual Ethernet Adapter #2   Ethernet 5                    1