Re: [Last-Call] [TLS] Last Call: <draft-ietf-tls-dtls-connection-id-10.txt> (Connection Identifiers for DTLS 1.2) to Proposed Standard

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hi Tom,

On 13/03/2021, 11:54, "tom petch" <daedulus@xxxxxxxxxxxxx> wrote:
> > Is your suggestion to remove the parenthetical?  I.e.:
> >
> > OLD
> >     A zero-length value indicates that the server will send with the
> >     client's CID but does not wish the client to include a CID (or
> >     again, alternately, to use a zero-length CID).
> >
> > NEW
> >     A zero-length value indicates that the server will send with the
> >     client's CID but does not wish the client to include a CID.
>
> Thomas
>
> Yes, that would fix this particular problem I have within this
> section.
>
> I word it that way since I did raise two other doubts about the
> wording in this section in my original post, one about successful
> negotiation, which seems to me an undefined term, and one about
> sending and receiving, which seems over-restrictive in the context.

At the top of the thread, you suggested to change:

>  If DTLS peers have negotiated the use of a CIDs using the ClientHello
>  and the ServerHello messages

into:

>  If DTLS peers have negotiated the use of a non-zero CID in at least
>  one direction, using the ClientHello and the ServerHello messages

which is fine with me.

However, I think it doesn't completely remove the ambiguity you are
pointing at.  So I'd suggest we also change the paragraph just above
from:

   If DTLS peers have not negotiated the use of CIDs then the RFC
   6347-defined record format and content type MUST be used.

to:

   If DTLS peers have not negotiated the use of CIDs, which includes the
   case where both sent a zero-length cid in their connection_id
   extensions, then the RFC 6347-defined record format and content
   type MUST be used.


Regarding your suggestion:

> "The DTLS peers determine whether incoming and outgoing messages
> need.." seems not to cater for unidirectional CIDs; perhaps
> "The DTLS peers determine whether incoming or outgoing, or both,
> messages need.."

It surely works for me.

cheers, thanks!




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