delayed multihoming/mobility set-up

[Pekka Savola <pekkas@netcore.fi>]

Hi,

Me and Dave Crocker sat down and thought about multihoming and mobility a
bit.  Among other things, we came up with one notion which may not have been
explicitly mentioned, but may be relevant:

  Is it necessary to ensure connection survivability prior to the connection
  establishment?

  Or, is it necessary to ensure connection survivability in parallel with
  the connection establishment?

  Or even, is it OK to just ensure connection survivability only for
  "long-lived" sessions (e.g., those which have lasted for longer than 5
  minutes), using some definition.

The last one would be obviously useful with low-mobility rate, or site
multihoming when the connection survivability method you're using would
require extra packets or extra delay to set up -- and you'd want to avoid
that when it's not necessary.

Note that in low-mobility or site multihoming scenarios you don't expect
the the multihoming to be required *immediately*; the risk increases in
proportion to the time.  Would an "intentional race-condition" be
acceptable in most cases?

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