Hesham 

>  > And I think the prefix with L=0 and A=1 may cause unnoticed address 
>  > duplication.
> 
> => If you advertise L =0 and want to assign the same prefix
> to multiple links, then you must be able to handle DAD, NS ...etc
> across links. This is what the ND proxy proposal does. 
> In other words, if you have a multi-link subnet, you better know
> how to relay ND traffic across links otherwise you could end 
> up with the problem you mention above. 

Let me summarize the above.

1. In principle, a prefix is assigned to only one link, whether L=0 or not. 
2. For multi-link subnet (the use of the same subnet prefix on multiple link), 
    special care is needed, for example ND proxying. 

Right? 

Thanks for enlightening comments. :-) I have clearer vision now.   

Best regards

JinHyeock 1H>þ°¢¹"ž+¢êfj)bž  
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