One of the fundamentally great things about the Wireguard protocol is the simplicity. A small codebase can implement it, and that’s lead to some great libraries and innovation.

Another great (and subtle) thing is the monotonically increasing sequence number. Note that it isn’t incrementing, like DTLS. This small thing makes it so much easier to implement with efficient concurrency, and event external state (i.e. distributed concurrency).

That latter bit we’ve done in our own library.

Edit: typo, don’t -> done