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[quicwg/base-drafts] Transport: Packetization layer PMTUD needs detailed specification (#614)

Magnus Westerlund <notifications@github.com> Thu, 08 June 2017 08:53 UTC

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Date: Thu, 08 Jun 2017 01:53:31 -0700
From: Magnus Westerlund <notifications@github.com>
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Subject: [quicwg/base-drafts] Transport: Packetization layer PMTUD needs detailed specification (#614)
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In draft-ietf-quic-transport-03, Section 9:

   All QUIC packets SHOULD be sized to fit within the estimated PMTU to
   avoid IP fragmentation or packet drops.  To optimize bandwidth
   efficiency, endpoints SHOULD use Packetization Layer PMTU Discovery
   ([RFC4821]) and MAY use PMTU Discovery ([RFC1191], [RFC1981]) for
   detecting the PMTU, setting the PMTU appropriately, and storing the
   result of previous PMTU determinations.

There are details in the method described in RFC 4821 that needs to have explicit description of how the method is applied in QUIC. This includes, format of probing packets, loss response, additional challenge of ICMP feedback. 

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