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On Wed, 10 May 2017 10:13:29 +0200
"Jason A. Donenfeld" <Jason@zx2c4.com> wrote:

> Lower the MTU of the WireGuard interface.

Correction: 4 bytes: from 1420 to 1416; done by a PostUp.

I've also seen something that wasn't much expected:
manually changing the MTU from 1418 to 1416 on the server, 
while VPN was on, also changed the IP address of the WG I/F:
	inet addr:0.0.5.136	!(?)

JY