Re: [quicwg/base-drafts] Describe PMTU probing that includes source connection ID for routing … (#2402)

[Igor Lubashev <[e-mail]>]

igorlord commented on this pull request.



> @@ -3274,6 +3275,22 @@ The considerations for processing ICMP messages in the previous section also
 apply if these messages are used by DPLPMTUD.
 
 
+### PMTU Probes Containing Source Connection ID {#pmtu-probes-src-cid}
+
+Endpoints that rely on the destination connection ID for routing QUIC packets
+are likely to require that connection ID included in PMTU probe packets in order
+to route resulting ICMP messages ({{icmp-pmtud}}) back to the correct endpoints.
+
+Only long header packets ({{long-header}}) contain source connection IDs, but
+long header packets will not be acknowledged once the connection has been
+established.  One way to construct a PMTU probe is to coalesce (see
+{{packet-coalesce}}) a Handshake packet ({{packet-handshake}}) with a short
+header packet in a single UDP datagram.  If the UDP datagram reaches the
+endpoint, the short header packet will be acknowledged.  If the UDP datagram
+elicits an ICMP message, that message may contain the source connection ID

Updated in the latest commit.

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