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

[Magnus Westerlund <[e-mail]>]

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.

I hope others in the WG has input on this.

Cheers

Magnus Westerlund

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