> Can you enumerate what assumptions you are concerned about?  That would
> give us the authors a better understanding of your concerns.

I've about decided to write up an I-D before 9 AM Monday on this topic,
but here's the capsule summary:

the basic problem with limited-scope addresses is that they force some 
kinds of apps (in particular those that need to do referrals) to 

a) know about network topology and/or 
b) to provide lists of addresses in referrals and do trial-and-failure 
   to determine which address works (best or at all) in any context
   to which a referral might be propagated.

limited-duration addresses (such as v6 temporary addresses or v4 LLs) 
impose other problems - apps that use them have to recover from 
address changes.

Keith
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