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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sat, 14 Apr 2018 04:06:11 +0200
Message-ID: <CAHmME9pYzb8M8379twgRNVU2gsZOWuwvBuBe2G1rorvekVzX_w@mail.gmail.com>
Subject: Re: Wireguard behind NAT
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If you can have SIDE_A connect to SIDE_B and enable
persistent-keepalive, that should take care of things mostly. If you
can't do that for whatever reason, there are hole punching tricks like
[1] and [2].

[1] https://git.zx2c4.com/WireGuard/tree/contrib/examples/nat-hole-punching
[2] https://github.com/manuels/wireguard-p2p