Re: [RAM] Ivip (was ViP ...)

[Robin Whittle <rw at firstpr.com.au>]

I wasn't suggesting any change to SHIM6's development.  What I
wrote:

>>> SHIM6 is clearly not the portability and multihoming system most
>>> end-users want, so on its own, it has not been enough to make people
>>> want to adopt IPv6 without PI address space.

seems to be factual.

Noel wrote:

> A architectural-level discussion of why people are unhappy
> with SHIM6, and how that relates to those inescapable
> technical drivers, might not be out of place here...

I agree.

I think a global system for LISP, Ivip or similar will be built.
 I think this system will provide good portability and hopefully
TE for ordinary hosts - IPv4 or IPv6 - without additions to the
protocol stack or changes to operating systems.  I think this
has to happen soon for IPv4, because the BGP system can't be
expected to keep up with the growth in the number of advertised
prefixes.  We have to find a way to provide portability,
multihoming, TE and ideally great mobility for millions of
end-users, without altering hosts.

SHIM6 would still work with any such LISP or Ivip system for
IPv6 - so it is "orthogonal" to any such system.  However the
things which SHIM6 would provide would already be largely or
entirely available via the LISP/Ivip system.

I understand that SHIM6 is basically a host-oriented system,
operating on a single IP address at a time, with the control
necessarily being exercised within the multihomed host itself.
I may be wrong - it is complex and I haven't properly read
draft-ietf-shim6-proto.

LISP/Ivip, as I envisage it working, can handle individual IP
addresses or arbitrary sets of addresses with equal ease, and
does not require any new software or for the host(s) whose
addresses are being managed to be in any way aware of it.
Nonetheless, a single host could manage its own LISP/Ivip
mapping, or some centralised system could perform this task for
it, for instance to choose the best ETR in a multihoming setting
when one link fails.

  - Robin          http://www.firstpr.com.au/ip/ivip/


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