On Sun, May 23, 2010 at 2:06 AM, Noel Chiappa <[email protected]> wrote:
> > From: Dae Young KIM <[email protected]>
>
> > the role of PoA is already served by MAC address, and not has to be
> > duplicated by extra 'Locator'.
>
> i) Not all networks have a MAC (although most do, now).
>
> ii) A MAC serves to globally _identify_ an interface, but it is not enough to
> _locate_ it (i.e. to be useful to the path selection). It will be necessary
> to add some extra information, such as a structured name of the network the
> interface is connected to, to make it an interface name which the path
> selection (routing) can use. After all, if you do not have that extra
> information, you basically have a world-wide bridged network.
Not necessarily. I think I can build a sound network topology only
with node addresses. CLNP, for example, didn't need interface address
to do routing.
>
> Remember, my question was in the context of a node which has _two_
> interfaces, to widely separated (in network connectivity terms) networks,
> such as i) a particular wireless LAN, and ii) a 3G cellular network.
Why should it be a problem in my picture?:
- At inter-net level, my node will have two links each pointing to a
remote router at the other surface of either LAN or 3G.
- LAN will identify one of the interface with its MAC address while
3G will do the other with its L2 address(whatever it is).
>
> > mobility is inherently supported by routers without resorting to extra
> > mapping (ID>Loc) or agent(HA/FA) infrastructure.
>
> Only within an AS. What happens if the node leaves the AS (perhaps to a
> different wireless LAN)?
Moving across LANs within an AS won't affect its fast mobility.
There'll surely be a problem in fast mobility when a node leaves an AS
for another AS:
o In its most primitive fashion, the TCP connection would break.
You have to reconnect.
o A fast inter-AS context-switching mechanism might be devised.
o DNS should be updated with a new mapping, name > (addr, AS-new).
This, of course, is a challenge; DNS synchronization is slow. How to
work around this?
I have yet to work on these inter-AS mobility issues. Hope I won't totally fail.
>
> Noel
>
--
Regards,
DY
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