As I’m typing this I’m guess it’s not possible but I’m posting here in case someone is more knowledgeable than I am (highly likely). Here goes.
I have a VPN client running in windows that lets me connect to a remote network.
Is it possible to use my WSL2 shell to piggy back off the windows VPN client to access that network? In case it matters, the client is Checkpoint Endpoint Security
Did a better search and found this for others who are looking
https://www.frostbyte.us/fixing-windows-subsystem-for-linux-wsl-name-resolution-errors-with-vpn/
I’m having the exact same issue, can’t seem to find a solution
Possible Solution:
https://github.com/microsoft/WSL/issues/4698#issuecomment-628682785
For AnyConnect
https://github.com/microsoft/WSL/issues/4277#issuecomment-561649724
I’m not able to get this working here with WSL2 and latest Win10 update. I’ve tried setting my Virtual Switch Manager to have WSL be “external” instead of “internal”, i’ve tried mucking with /etc/resolv.conf files to explicitly list my VPN’d dns servers, etc.
Everything was working fine before upgrading from wsl v1 to v2 
Looks like I may have to downgrade to v1