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Refine minimum DCID length of Initial #2001

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4 changes: 4 additions & 0 deletions draft-ietf-quic-transport.md
Expand Up @@ -1318,6 +1318,10 @@ packet is received from the server, the client MUST use the same value unless it
abandons the connection attempt and starts a new one. The initial Destination
Connection ID is used to determine packet protection keys for Initial packets.

A client SHOULD select a Destination Connection ID length long enough to fulfill
the minimum for every QUIC version it supports. This increases the chance
subsequent Initial packets are routed to the same server.

The client populates the Source Connection ID field with a value of its choosing
and sets the SCIL field to match.

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