WSL2 and Wireguard

[Ruben Di Battista]

Ehi Jason!

Thanks for the detailed answer. I just checked on the new 0.3 and the
problem still persists. I'm not a network engineer, but I think it
might be useful if you can provide more details in the Github issue
(or the one I link in the second comment) that could help speed up the
process...

I guess it's a problem with their hyper-v networking adapter...

On Mon, Nov 23, 2020 at 5:51 PM Jason A. Donenfeld <Jason at zx2c4.com> wrote:
>
> Hi Ruben,
>
> On Mon, Nov 23, 2020 at 5:43 PM Ruben Di Battista
> <rubendibattista at gmail.com> wrote:
> >
> > Hello,
> >
> > I'm experiencing a problem with Wireguard and WSL2. If I activate my
> > tunnel and then I ping a machine on the VPN IP range from WSL2, I
> > don't get any response.
> >
> > However, if after activating Wireguard, I ping from cmd or PowerShell,
> > I successfully get the ping back and I'm able then also to ping from
> > WSL2.
> >
> > I'm not sure if this is related to Wireguard or WSL2, In any case I
> > reported the bug here: https://github.com/microsoft/WSL/issues/5810
> >
> > Is it a problem of my machine, a problem from WSL2 or Windows Wireguard?
>
> That's pretty weird. I've seen a few related bugs like that, where it
> seems like WSL will drop packets that don't meet some unusual stateful
> criteria. I don't know if they're trying to do some kind of connection
> tracking, or if the routing logic is partially broken for NdisMediumIP
> devices.
>
> I assume you're experiencing this using the latest WireGuard 0.3 [1]?
>
> To answer your direct question, though, I think this might be a WSL
> problem rather than a WireGuard problem. If that Github issue doesn't
> get any attention after some time, I can try to reverse engineer the
> hyper-v networking drivers to see what's going on, but as always with
> that kind of thing, no guarantees on its success.
>
> Jason
>
> [1] https://lists.zx2c4.com/pipermail/wireguard/2020-November/006075.html



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