Re: [AVTCORE] I-D Action: draft-ietf-avtcore-6222bis-02.txt

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

-----Original Message-----
From: Magnus Westerlund <[e-mail]>
Date: Monday, April 22, 2013 4:02 PM
To: "Ali C. Begen" <[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-6222bis-02.txt

>On 2013-04-22 08:11, Ali C. Begen (abegen) wrote:
>> Hi Magnus,
>> 
>> I am not that knowledgeable about how the virtualization products deal
>> with their networking interfaces. While I am not comfortable to make a
>> generalization and somewhat blame such products for improper selection
>>of
>> mac addresses, what about the following change?
>> 
>> After the following bullet in section 4.2:
>> 
>> To produce a short-term persistent RTCP CNAME, an RTP endpoint
>>       MUST either (a) use the numeric representation of the layer-2
>>       (Media Access Control (MAC)) address of the interface that is used
>>       to initiate the initial set of RTP sessions as the "host" part of
>>       its RTCP CNAME or (b) generate and use an identifier by following
>>       the procedure described in Section 5.  In either case, the
>>       procedure is performed once per initialization of the software.
>>       After obtaining an identifier in case of (a), the 48 bits are
>>       converted to the standard colon-separated hexadecimal format
>>       [RFC5342], e.g., "00:23:32:af:9b:aa", resulting in a 17-octet
>>       printable string representation.  In case of (b), minimally the
>>       least significant 96 bits SHOULD be converted to ASCII using
>>       Base64 encoding [RFC4648] (to compromise between packet size and
>>       uniqueness - refer to Section 6.1).  If 96 bits are used, the
>>       resulting string will be 16 octets.
>> 
>> 
>> Add the following text?
>> 
>> "In some environments (for example, a virtualized operating system), the
>> MAC address may not be unique as expected. In these cases, using option
>> (b) above is RECOMMENDED."
>> 
>
>Thanks, that is exactly what I wanted. Resolves my issue fully.

Cool, I will implement this change in a few days unless there are
objections and then maybe we can move forward?

>
>I hope others in the WG has input on this.
>
>Cheers
>
>Magnus Westerlund
>
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