Re: [quicwg/base-drafts] Update draft-ietf-quic-transport.md (#105)

[Martin Thomson <[e-mail]>]

martinthomson commented on this pull request.



> -The maximum packet size for QUIC is the maximum size of the encrypted payload of
-the resulting UDP datagram.  All QUIC packets SHOULD be sized to fit within the
-path's MTU to avoid IP fragmentation.  The recommended default maximum packet
-size is 1350 bytes for IPv6 and 1370 bytes for IPv4.  To optimize better,
-endpoints MAY use PLPMTUD {{!RFC4821}} for detecting the path's MTU and setting
-the maximum packet size appropriately.
+The maximum packet size for QUIC is the maximum size of the entire UDP payload,
+including the public header, encrypted payload, and any authentication fields.
+All QUIC packets SHOULD be sized to fit within the path's MTU to avoid IP
+fragmentation. To optimize bandwidth efficiency, endpoints SHOULD use Path MTU
+Discovery ({{!RFC1191}}, {{!RFC1981}}) for detecting the path's MTU, setting the
+maximum packet size appropriately, and storing the result of previous PMTU
+determinations.
+
+(TODO: Should there be a high minimum MTU for QUIC to avoid ICMP attacks? If so,
+does the endpoint fail over to TCP or simply allow fragmentation?)

Rather than log this here, open a separate issue.

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