Re: [RAM] Incremental Deployment of LISP

[jnc at mercury.lcs.mit.edu (Noel Chiappa)]

    > From: HeinerHummel at aol.com

    > Yes, and isn't this the origin task of any routing protocol to
    > advertise WHERE some user is located ? (rather than the task of DNS ?),
    > i.e. to communicate to the rest of the internet "I have reachability to
    > this or that user ?"

"[saying] where some user is" and "communicating ... I have reachability to
this or that" are two entirely different things - or rather, they can be, and
have been for many decades now in most networking designs, separated into two
different tasks.

It's a general law of system design that as systems grow, it's usually the
case that a single mechanism A that did both X and Y needs to get separated
into two separate mechanisms B and C, one each for X and Y - which means that
it would be an extremely bad idea to go in the reverse direction as a system
got larger.

In other words, trying to do both:
- finding out where some user/computer/etc is, and
- finding out if/how to get there
in a single mechanism would be a really bad idea.

"All problems in computer science can be solved with another level of
indirection" - variously attributed to Butler Lampson and David Wheeler.

	Noel

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