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Re: [quicwg/base-drafts] When can the connection ID be omitted? (#659)

MikkelFJ <notifications@github.com> Fri, 23 June 2017 11:05 UTC

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Date: Fri, 23 Jun 2017 04:05:20 -0700
From: MikkelFJ <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] When can the connection ID be omitted? (#659)
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See Transport parameters

> An endpoint MAY use the following transport parameters:
truncate_connection_id (0x0004):

>The truncated connection identifier parameter indicates that packets sent to the peer can omit the connection ID. This can be used by an endpoint where the 5-tuple is sufficient to identify a connection. This parameter is zero length. Omitting the parameter indicates that the endpoint relies on the connection ID being present in every packet.

See also #645

Note that as long as the SCID cannot be mapped to CCID, then 5-tuple uniqueness is necessary, and addding the connection ID is of limited value to end-points, but may help middle boxes. If SCID were mapped to CCID, the connection ID could be used to associate connection state on any transport, but this not currently possible:
https://tools.ietf.org/html/rfc2549

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