Re: [RRG] Evolutionary Possibilities - host MH/portability, IPv4 address depletion

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

Hi Randall,

You wrote, in part:

> [3] Maybe I have missed something somewhere (certainly I am 
> behind in my reading of various proposals), but it also is not 
> obvious to me that the map-and-encapsulate solution class is
> helpful for things beyond site multi-homing -- for example (a)
> host  multi-homing, (b) host mobility, (c) network mobility. 

I intend that Ivip achieve all these.

I think the LISP folks are unhappy with the idea of individual IPv4
IP addresses being used as EIDs (or I guess /64s for IPv4) so I
think they are aiming their system to do "network" (many IP
addresses and hosts per EID prefix) multihoming, not "host" multihoming.

So far, Ivip is the only map-encap proposal which explicitly aims to
provide mobility - for networks or single IP addresses.  To do this,
a fast push system is needed - either to all ITRs in the world (pure
push), or to some and to query servers which answer mapping queries
for nearby caching ITRs (hybrid push-pull).  I think there also
needs to be a notification system by which the query server can send
a message to an ITR about updated mapping for a micronet (EID
prefix) which it queried recently and which has just had its mapping
changed.

> A question in my mind is whether the Routing RG is trying to solve
> just the narrow near-term issue of RIB/FIB scaling issues caused
> by site multi-homing XOR the Routing RG is trying to create an
> enhanced architecture that solves a much broader set of
> current/future issues.

I believe we should be doing the latter.  That is what I am working
on - including using Ivip to help with the IPv4 address depletion
problem by enabling much finer management of address space, to allow
much higher utilization rates.

That said, I think LISP, APT, Ivip or TRRP could all be used for
"host multihoming / portability" and for the finer slicing and
dicing we need to better utilize IPv4 space.  (LISP, APT and I think
TRRP can do TE for individual IP addresses - Ivip can't.)

  - Robin


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