Remi,

>> While, generally to be compatible with double translation, the 4rd IID can 
>> be employed.
> 
> Actually, having a recognizable format for 4rd addresses makes it possible 
> for hosts behind a 4rd CE to use any other IPv4-in-IPv6 encapsulation that 
> 4rd without their packets being (inappropriately) processed as 4rd packets by 
> the CE.
> 
> With a 4rd-recognizable IID, there is a guarantee that 4rd will never 
> interfere with any non-4rd protocol.  
> 
> OK?
> 
> Thats AFAIK an important feature.
> I remember a discussion with Wojciech about this, which maybe he could 
> confirm.

not so much so for encapsulation. since the 4rd tunnel end point address is one 
of the CE's own addresses, the interface-id only matters for pretty printing 
and if features/classifiers are applied in the middle of the tunnel.

cheers,
Ole


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