Re: Re:loc/id vs HIP (was: tunneling [Was: Agenda for Vienna])

[Pekka Savola <pekkas@netcore.fi>]

On 22 May 2003, marcelo bagnulo wrote:
> > Again: this doesn't solve the whole problem.  Consider e.g. Craig's
> > traffic engineering requirements, or (to a lesser degree) requirements
> > that the nodes should not have to renumbered ("deploying/retiring
> > locators") when the ISP's are changing.
> 
> A comment about the renumbering issue.
> First i do not think this is part of the multi-homing issue, so if we
> find a solution that does not solve this i would say it is ok.

Well, I think it is, practically, to an extent.  If Site is multihomed 
using two prefixes to two providers, and wishes to switch the second one 
to a better one, this should not be an overwhelming task (otherwise folks 
might not want a multi-address solution in the first place).

> However, i do think that it is a related problem and it would be
> interesting to find a solution that also support this (just as it would
> be nice that the split loc/id provides support for mobility)

Yep.
 
> In the particular case of HIP, i think that it does facilitates
> renumbering. Renumbering involves changing addresses in hosts but it
> also involves changing ACLs and other configurations that involve IP
> address as identifier.

Yes, HIP makes it much easier.  However, the backward 
interoperability might require checking for locators anyway, or 
a way to ensure that bad guys don't spoof identifiers.

> Since HIP provides a stable identifier, those configurations could use
> the stable identifier instead of the address. I agree that this does not
> completely solve the issue. The cost of this is that the identifier has
> to be carried in every packet, i guess.

Of course, many of those ACL's could be obsolete by then, right..

Or one could have locator-to-identifier and identifier-to-locator mapping
functions.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings