Multihoming scales and is reliable and easy, if it is offered end to
end by intelligent end systems, transport/application protocols on
which directly handles all the multiple IP addresses from DNS
(and mobility).
uh, no. multihoming done by end systems has a different set of problems
than multihoming done by routers. end systems have no good way to keep
track of changes to network topology, and the effort and network traffic
that would be required to inform them of such changes makes that approach
to multihoming much less attractive. also, it is very hard to support
mobility satisfactorily in this manner, especially when multiple
communicating end systems are moving at the same time.
Keith