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Re: Re:loc/id vs HIP (was: tunneling [Was: Agenda for Vienna])
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)
> 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
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings