topic Re: WSL Terminal can't ping but CMD can ping and SSH. Internet unaffec in Network Security

WSL Terminal can't ping but CMD can ping and SSH. Internet unaffected

as226855 — Tue, 05 Sep 2023 10:23:51 GMT

So With VPN off, my WSL terminal can ping/ssh, but as soon as I turn on VPN, terminal cannot ping/ssh but CMD can. Here is a screeenshot. Can you please help me with this issue? I searched a lot but did not find a solution. The small terminal on the left is WSL and the large terminal on the right is CMD.

Re: WSL Terminal can't ping but CMD can ping and SSH. Internet unaffec

Marius Gunnerud — Tue, 05 Sep 2023 11:59:33 GMT

So when AnyConnect is connected you cannot ping from WSL but CMD is able to ping?

Is the AnyConnect VPN running tunnel-all traffic? or Split-tunnel?
What DNS is the WSL using compared to your PC's DNS?

Re: WSL Terminal can't ping but CMD can ping and SSH. Internet unaffec

giovanni.augusto — Tue, 05 Sep 2023 12:38:48 GMT

As far as I can see on my own WSL2 VM I am experiencing the same behavior, from a quick search online I can see many other people does too.

Personally I can tell that this happens to me with a VM using WSL2 version, if you switch to WSL1 most likely it will work as the network stack is different.

If you want a potential solution for your problem you can look into this specific topic from WSL github page: https://github.com/microsoft/WSL/issues/4731#issuecomment-1203643323

I haven't tried it but you may and let us know.

Re: WSL Terminal can't ping but CMD can ping and SSH. Internet unaffec

Marvin Rhoads — Tue, 05 Sep 2023 13:09:10 GMT

I have seen clients with issues using WLC + VPN due to the VPN client not updating WLS's DNS settings. Their work around was to manually change the DNS settings in WSL when connected to VPN.