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Hi Jens, I assume it was you asking in the IRC channel about this same thing before signing out? Sorry I wasn't there when you were; I only just now arrived home. There actually is some optimization potential for you with regards to the MTU. The overhead of WireGuard breaks down as follows: - 20 byte IPv4 header or 40 byte IPv6 header - 8 byte UDP header - 1 byte type - 4 byte key index - 8 byte nonce - N byte encrypted data - 16 byte poly1305 authentication tag So, if you assume 1500 byte ethernet frames, the worst case (IPv6) winds up being 1500-(40+8+1+4+8+16), leaving N=1423 bytes. However, if you know ahead of time that you're going to be using IPv4 exclusively, then you could get away with 1443 bytes. Hope that helps, Jason