Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01

On Mar 26, 2013, at 2:57 AM, Ali C. Begen (abegen) <abegen@cisco.com> wrote:

> -----Original Message-----
> From: Magnus Westerlund <magnus.westerlund@ericsson.com>
> Date: Tuesday, March 26, 2013 11:49 AM
> To: "Ali C. Begen" <abegen@cisco.com>
> Cc: "avt@ietf.org" <avt@ietf.org>,
> "draft-ietf-avtcore-6222bis@tools.ietf.org"
> <draft-ietf-avtcore-6222bis@tools.ietf.org>
> Subject: Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01
> 
>> On 2013-03-25 21:00, Ali C. Begen (abegen) wrote:
>>> Thanks for the review.
>>> 
>>> On Mar 25, 2013, at 5:07 PM, "Magnus Westerlund"
>>> <magnus.westerlund@ericsson.com> wrote:
>>> 
>>>> wonder of its persistence behavior as it says to use the MAC of
>>>> the Interface that ones initiate the communication over. With
>>>> multiple interfaces, I can in the context of an application use all
>>>> of these interfaces over a set of calls. Thus it doesn't have
>>>> particular good long term stability either.
>>> 
>>> I think it is meant to say the interface over which the initial
>>> connection was made not all other possible interfaces that could be
>>> used during the rtp session.
>>>> 
>> 
>> The main point I try to get across is that which interface you use for
>> the initial connection varies between different communication
>> establishments. If your goal is to have a long term persistent
>> identifier then you need to store the first one used in the context of
>> an application and use that, rather than take the interface you used for
>> the SIP dialog, or similar, used to establish this particular RTP
>> session(s).
> 
> The text is not saying to use MAC for long-term persistent CNAME. It says
> to use it for *short-term* persistency. Sorry, I am not getting where
> there is unclarity.

I think what Magnus is saying is that one person's long term is another person's short term, and the text needs to explain this situation.  How about this:

    For the duration of an RTP session, different interfaces
    might be used.  For example, a single RTP session might be
    established on a WiFi interface and a mobility event moves
    that session to a 3G interface.  When such an interface change
    occurs, the same CNAME MUST be retained.

-d

> 
> 
>> 
>> Cheers
>> 
>> Magnus Westerlund
>> 
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> 
> 
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