Subject: RE: [Mip6] tying flow movement to MIP RE: [Mipshop] Minutes of M ultiple Lin k Flows BAR BOF

From: Soliman Hesham <[email-masked]>
Date: Tue, 18 Nov 2003 01:12:20 -0500

Hi James, 

 > This is a little bit different perspective than the one I've 
 > been coming at
 > this from. If I understand you correctly, you seem to be 
 > assuming that the
 > correspondent node has knowledge of the additional care of addresses
 > available to the mobile node, correct? 

=> Not initially. The CN (in MIPv6) can only know that
if RO was already done. 

 > i.e. the mobile node tells the correspondent to move a 
 > particular flow to a
 > different care of address using a binding update that is 
 > somehow enhanced to
 > indicate which flow should be handed off (perhaps a use for 
 > the new flow
 > label work in the IPv6 WG?) 

=> That's _a_ solution for sub-problem (2). This is basically
how we tried to solve this part in our draft. The flow label
is one way, you could also use the port numbers and IP addresses.

   instead of handing off all flows. This is
 > certainly much cleaner than treating the home agent as a 
 > middlebox and
 > trying to accomplish the flow handoff there.

=> Yes but if you want to aggregate this BU by sending
one to the HA/MAP and getting the flows split there, 
things would certainly be more efficient in terms
of signalling overhead. It would also be quicker. 

 > However, for MIPv4, this won't work because there is no 
 > route optimization.
 > Flow handoff will have to occur at the home agent. And, any 
 > indication of
 > which flow to handoff will probably require looking into the 
 > transport
 > header to determine the port number, the kind of thing 
 > typically done by
 > firewalls and NATs in IPv4. 

=> And routers ;) they do for traffic engineering.

   This is decidedly less 
 > appealing, because it
 > involves middlebox functionality on the home agent. 

=> Actually, it's already there today.

   If 
 > that's the case, then
 > the issue is what should the signaling look like between the 
 > mobile node and
 > home-agent-as-middlebox to accomplish the flow handoff?

=> Yes that's one issue. As we start looking at solutions
i'm sure there will be more issues.

Hesham

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