Re: [quicwg/base-drafts] Rewrite Packet Size section (#2036)

[Tom Jones <[e-mail]>]

adventureloop commented on this pull request.



> +* An endpoint could store additional information from the IP or UDP headers to
+  use for validation (for example, the IP ID or UDP checksum).
+
+The endpoint SHOULD ignore all ICMP messages that are not validated or do not
+carry sufficient quoted packet payload to perform validation.  Any reduction in
+the QUIC MPS MAY be provisional until QUIC's loss detection algorithm
+determines that the quoted packet has actually been lost.
+
+## Considerations for Datagram Packetization Layer PMTU Discovery
+
+Section 6.4 of {{!DPLPMTUD}} provides considerations for
+implementing Datagram Packetization Layer PMTUD (DPLPMTUD) with QUIC.
+
+When implementing the algorithm in Section 5.3 of
+{{!DPLPMTUD}}, the initial value of BASE_PMTU SHOULD be
+consistent with the minimum QUIC packet size.

>  Assuming the minimum IP header size, this results in
> a QUIC MPS of 1232 bytes for IPv6 and 1252 bytes for IPv4. A QUIC
> implementation MAY be more conservative in computing the QUIC MPS to allow for
> unknown tunnel overheads or IP header options/extensions.

>From above the QUIC minimum packet size would be 1252 or 1232. We avoided a number here to be consistent with the 'MAY be more conservative'


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