On 17 Sep 2013, at 07:56, <[email protected]> 
<[email protected]> wrote:

> One comment I have when reading this reco from your draft:
> 
>      It is recommended that an identifier be used at the layer at which
>      its functionality is necessary for communication to be
>      established.
> 
> is, from a privacy perspective, there is no justification for it


I think it is an extension of the principle, that information should only used 
for the purpose for which it was collected, or in this case included in the 
packet.  In order to make privacy abuse more difficult each layer should be as 
privacy enhancing as possible.

While it is true that some information needs to be sent to another layer to 
support that layers basic functions, this should be kept to a minimum needed 
for functionality.  and and I can't think of a reason ever for information to 
be used at layer+-2 unless specifically pased by layer+-1.

avri


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