On 10/23/2017 07:12 AM, Eric Rescorla wrote:
>
>      Another comment is about symmetrical CID.
>
>     1.       Consider a client sends a normal CID (CID length is not
>     zero, named C-CID) to server, but the server doesn’t wants to use
>     client’s CID and sends a CID generated by the server (named S-CID)
>     to the client.
>
> No. The CID is for the client's benefit, so why would this be useful?
>  
>
>     At the same time, client needs to know server has ignored C-CID
>     (which means the downlink application message from the server will
>     not include C-CID), and client will use S-CID in its application
>     message. Will the draft cover this scenario?
>
> No.

That is to say, this draft does not consider symmetrical CIDs at all.

-Ben
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