Re: [quicwg/base-drafts] PMTUD (ICMP variant) (#105)

[martinduke <[e-mail]>]

martinduke commented on this pull request.



> +peer is using in the connection. Endpoints SHOULD maintain an estimate for each
+combination of local and remote IP addresses (as each pairing may have a
+different minimum MTU in the path).
+
+## Packet MTU Determination
+
+Path MTU Discovery is optional, but endpoints that implement it observe the
+following requirements.
+
+### DF Marking {#dfmarking}
+
+QUIC endpoints set the Don't Fragment (DF) bit in the IP header of selected
+QUIC datagrams. These packets MUST use PADDING frames, as necessary, to raise the
+overall packet size to the expected maximum.
+
+The first packet from the client MUST be maximum-size and set the DF bit.

> Is that an RFC6919 "MUST (but we know that you won't)"?

It may very well be. I thought there was consensus that QUIC endpoints MUST pad handshake packets, but if not we can fight it out in #106.

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