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

["Ali C. Begen (abegen)" <[e-mail]>]

-----Original Message-----
From: Qin Wu <[e-mail]>
Date: Thursday, April 11, 2013 2:04 PM
To: "[e-mail]" <[e-mail]>
Subject: [AVTCORE] 答复:  Reminder: Re: WG last call
on	draft-ietf-avtcore-6222bis-01

>Hi, Ali:
>Here is my quick review to draft-ietf-avtcore-6222bis-01:
>1. Section 1 and Section 3:
>It is not clear how the section 1 is related to section 3?

Section 1 is motivating the need for the bis document.

>Is this draft focusing on tacking linkability issue or deficiency issues
>described in section 3?

This draft is not an update on 6222, it replaces it so it has the text
from 6222 as well.

> 
>What the linkability issue is? It is not obvious to a reader who are not
>familiar with this although this draft point to
>[I-D.rescorla-avtcore-random-cname] in the section 1?

For the sake of RTCP CNAME, you dont need to know the details of
linkability concerns the rescorla draft discusses. It is simply there
since it was the reason why we started this bis work in the first place.

>
>2. PRNG needs to be expanded or point to a reference.

Will fix it.

>
>3. Section 6.1
>The last sentence said:
>"
>A length of 96 bits allows on the order of
>2^{40} RTCP CNAMEs globally before there is a large chance of
>collision (there is about a 50% chance of one collision after 2^{48}
>RTCP CNAMEs).
>"
>I am difficult to understand the rationale for this calculation since I
>don't know What "2^{40}" stand for?
>How "40" is related to the length of 96 bits?

This info comes from
http://tools.ietf.org/html/draft-rescorla-avtcore-random-cname-00 section
4. Eric might provide more info if you need.

>
>4.6.2
>I can understand the first sentence, but I don't understand the second
>one. 
>What kind of correlation need to be prevented? Why such correlation
>should be prevented?

If you keep using the same RTCP CNAME in all of your sessions, someone
might track you. In some cases, you might want that, in some cases you
won't. That is what this sections is saying you. Based on what you want,
choose a persistent vs per-session RTCP CNAME.

>Isn't this section focusing on talking about how to correlate sessions?
>What am I missing?

I hope it is clearer now.

Thanks,
-acbegen

>
>Regards!
>-Qin
>-----邮件原件-----
>发件人: [e-mail] [mailto:[e-mail]] 代表 Magnus
>Westerlund
>发送时间: 2013年4月10日 15:58
>收件人: Magnus Westerlund
>抄送: [e-mail]
>主题: Re: [AVTCORE] Reminder: Re: WG last call on
>draft-ietf-avtcore-6222bis-01
>
>WG,
>
>This WG last call has concluded. I think the level of reviews on this
>document are very low. In the working group last call only Kevin Gross
>and I have stated that they have reviewed the latest version.
>
>Authors please address raised issues.
>
>I will not consider this a successful WG last call unless at least one
>additional person reviews it who are not an author. It is a very short
>document and it also don't require massive amounts of additional
>knowledge beyond basic RTP understanding to review.
>
>Regards
>
>Magnus Westerlund
>WG chair
>
>On 2013-03-28 11:01, Magnus Westerlund wrote:
>> WG,
>> 
>> So far there has be no other reviews of this document than mine.
>> 
>> Can someone please review this document?
>> 
>> I hereby extended the WG last call with one week until the 7th of April.
>> 
>> Cheers
>> 
>> Magnus
>> 
>> On 2013-03-12 20:04, Magnus Westerlund wrote:
>>> WG,
>>>
>>> This is to announce the start of a WG last call on:
>>>
>>> Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names
>>> (CNAMEs) to be published as a proposed standard.
>>>
>>> Document can be retrieved here:
>>> https://datatracker.ietf.org/doc/draft-ietf-avtcore-6222bis/
>>>
>>> Please provide any feedback by the 31st of March.
>>>
>>> Regards
>>>
>>> Magnus Westerlund
>>> WG chair
>>>
>>>
>>> ----------------------------------------------------------------------
>>> Multimedia Technologies, Ericsson Research EAB/TVM
>>> ----------------------------------------------------------------------
>>> Ericsson AB                | Phone  [phone]
>>> Färögatan 6                | Mobile [phone]
>>> SE-164 80 Stockholm, Sweden| mailto: [e-mail]
>>> ----------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> Audio/Video Transport Core Maintenance
>>> [e-mail]
>>> https://www.ietf.org/mailman/listinfo/avt
>>>
>>>
>> 
>> 
>
>
>-- 
>
>Magnus Westerlund
>
>----------------------------------------------------------------------
>Multimedia Technologies, Ericsson Research EAB/TVM
>----------------------------------------------------------------------
>Ericsson AB                | Phone  [phone]
>Färögatan 6                | Mobile [phone]
>SE-164 80 Stockholm, Sweden| mailto: [e-mail]
>----------------------------------------------------------------------
>
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