Subject: Re: [quicwg/base-drafts] Adds text about server padding handshake to PMTU (#1013)

From: Martin Thomson <[email-masked]>
Date: Mon, 15 Jan 2018 20:10:37 -0800

martinthomson commented on this pull request.

 Servers MUST ignore an initial plaintext packet from a client if its total size
 is less than 1200 octets.
 
+Similarly, servers MUST ensure that the first handshake packet they send to
+clients, and any retransmissions of those octets, has a QUIC packet size that is
+the same as the received initial client packet, unless the server knows the PMTU
+to the client to be smaller. Sending a packet of this size ensures that the

I agree that this would make it much more difficult to implement.  You need special handling for this case and I can see how you would end up with a fixed size for Handshake packets.  That would be unfortunate for several reasons.

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