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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 29 Nov 2017 14:12:21 +0100
Message-ID: <CAHmME9re6nRwz3C245Fo=2z2sbGLRJJwp+pKg9sJ8DQvT8Lmjg@mail.gmail.com>
Subject: Re: Dynamic Adresses
To: Mytril <mytril42@posteo.de>
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Hello Mytril,

This isn't a bug. DNS is resolved at configuration time. If you'd like
to continually reresolve the DNS, you can do this with a script in any
way you wish. WireGuard is a building block, meant to be used with a
variety of other things like this.

The contrib/examples directory has one such script that can be used:
https://git.zx2c4.com/WireGuard/tree/contrib/examples/reresolve-dns

I'm sure you can come up with one well suited for your uses.

Regards,
Jason