On 22 mar 2005, at 17.22, Margaret Wasserman wrote:
At 11:05 PM +0100 3/22/05, Iljitsch van Beijnum wrote:
That would require some serious voodoo as these are nearly always
managed by different entities. So essentially this would keep the
problem the same but require wifi base stations and gsm/umts
infrastructure to solve this and hide the complexity from the hosts.
This isn't traditionally the way the IETF does things.
I was actually expecting that, to get this to work well, you'd need
to purchase the 3GPP/802.11 roaming service from a single provider...
I don't expect this to be the case in all cases.
In my view of things there is definitely a case where L3 could
reasonably be involved.
What I expect to happen is that a 3G/802 equipped device/node would
move into a zone where 802 was possible and where at some point it
could be connected to two or more providers at the same time, sort of
multihomed. During this interval it could have separate addresses
given by different providers. And as in any multihomed node it could
chose which provider to use based on its own policy constraints. As
it moved from one zone's prevalence to another or from one provider's
area to another, the balance would change and different providers, and
L3 addressing possibilities, could become available.
And while it is true that one could use the extensive machinery of MIP
to make this work, it seems to me that using the multihoming shim's
capabilities could be a lighter weight possibility. But while it is
possible that support for this sort of movement could just fall out of
the shims specialized for static and fixed multihoming,