> The "problem" here is that don't have all the names/IDs we'd like. For 
> example, using the MAC address as the Interface_ID would do for this 
> purpose... but the the IPv6 address is tied to the MAC address, and would 
> change upon replacement of the NIC (which is generally undesirable)...

Undesirable by whom? For a laptop, for example, the most likely cause of a MAC 
address change is that the user/owner used an administrative command to change 
it, probably in an attempt at getting privacy. Keeping the same IID would 
defeat the purpose.

On the other hand, if I am managing a big server, I would like to retain the 
same IPv6 addresses to avoid disrupting service. But then, if I want a fixed 
address, I would probably ensure that by configuring a fixed address, not by 
relying on a side effect of automatic address configuration.

-- Christian Huitema


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