Re: [quicwg/base-drafts] Updated ICMP PMTU section (#1412)

[Igor Lubashev <[e-mail]>]

igorlord commented on this pull request.



>  
-### Special Considerations for Packetization Layer PMTU Discovery
+#### ICMP PTB During Handshake  {#icmp-ptb-during-handshake}
+
+It is important that any problems are detected quickly during the connection
+handshake, because the client may be able to mitigate them by switching to
+alternative IP addresses or protocols.  Hence, an endpoint SHOULD reduce Path

Re-reading PLPMTUD, the draft says explicitly that it is an extension to the classical (ICMP-based) PMTU discovery process and its prescriptions are to be used in cases where ICMP-based PMTU discovery cannot be done.  So say that PLPMTUD is a SHOULD is effectively saying that ICMP is a SHOULD (as much as practicable).

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