Re: Why is IPv6 a must?

[Eliot Lear <lear at cisco.com>]

> does the rendezvous location really have to be the "original topological
> location" of the host or is that just how folks started thinking about it?
>
> and given that the rendezvous location has to be somewhere in the network,
> how can we get around the problem that that location might become 
> unreachable no matter where it's located?   I mean, you could replicate 
> the information to multiple sites and use anycast to find a location, but 
> would this fundamentally change the mobile IP protocol?

How would you do this such that you did not further aggravate route 
scaling problems?  If you do it with mobile-ip and anycast, would that 
would require such mobile addresses having either additional IGP or 
(worse) BGP paths?

On the other hand, if you have the rendevous be a database that maps some 
sort of a name to an IP address you do not perturb the routing system and 
you impose the overhead on those who are mobile, and their agents.  It 
requires a model without TTLs but initialization and active notification. 
 Whether this can be done is questionable and a valid topic of research 
(a bunch of us have been questioning for a while ;-)

Eliot