Excerpts from Toni Stoev on Sat, Aug 15, 2009 11:23:53PM +0300:
> "Why should it be simple when it can be complex?" -- Folklore
> 
> You are reading your email off your portable computer and you have a 
> constantly updated weather map on your desktop. You may be chatting through 
> an instant messaging service and may be listening to live-streamed audio, and 
> may start talking on the computer videophone.
> You move to a different room, so you unplug your network cable, and you know 
> a wireless link will keep those communications running.
> Your local router has to realize the situation and stop transmitting 
> communications packets to the cable interface and start transmitting them to 
> the computer's wireless interface, and any broken sessions have to be 
> re-established with remote servers.
> You are the same person using the same network services on your same computer 
> through your same router, but you experience service slowdown or even need to 
> reinitiate some of the communications. Why?

Your local router doesn't have to solve this problem.  It's
end-to-end, and each of those flows may have a different solution.
Some like the weather map may be solved in the application.  You might
find this interesting:

http://www.ietf.org/mail-archive/web/multipathtcp/current/maillist.html

(for multipath SCTP see the TSVarea list)
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