AW: Hyper-V 2019: unable to create wintun device: no interfaces found

news at news at
Sun Aug 25 21:04:12 CEST 2019

The script is probably more efficient but significantly less consumable to me (I would not be willing to try to translate this to windows) then ping -c1 || pull down and up I read somewhere else. Actually I have some more cases in my script, but cannot include them because the client is sleeping (and the router has an issue with wol right now). I guess my script is less adaptable and supports just one client, but does the trick.
Please, please, please - there must be a better place to do this automatically without extra scripting..
Thanks, Joachim

-----Ursprüngliche Nachricht-----
Von: Jason A. Donenfeld <Jason at> 
Gesendet: Sunday, 25 August 2019 20:55
An: news at; Simon Rozman <simon at>
Cc: WireGuard mailing list <wireguard at>
Betreff: Re: Hyper-V 2019: unable to create wintun device: no interfaces found

On Sun, Aug 25, 2019 at 12:52 PM <news at> wrote:
> not the port. My external IP is dynamic. This is really standard for internet services in Germany offered to non-business users, or also business that prefer not the pay extra charges for the assignment of a static ip address. My IP address changes at least once a day (usually between 1 am and 2 am). Usually one uses a dyndns provider, and many routers support updating the ip address automatically. As I am running my external DNS with cloudflar, I am calling their API to update my external address.
> Now afaik Wireguard resolves the domain name of the server just once to an IP address and not regularly or whenever the connection breaks down or has been idle for some time.
> PersistentKeepAlive cannot address the issue, as the client is also not awake all the time in order to save energy. Looking at wg /? on windows I also don´t see any option that seems applicable..

Ahhh, the DNS re-resolution issue. On linux we have this nice script:

On windows, it should be pretty easy to do as well. You can actually just use task scheduler to run `wg set wg0 peer ABCD...EF= endpoint somewhere.on.dyndns:1234` every minute or whatever you feel is best.

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