Dean Willis writes:

 > One nifty technique is to pair up the proxies, such that there are N/2  
 > pairs, then define a hash across the namespace that maps to each user  
 > ID to one of those pairs, Your UA will then end up registering to and  
 > forming a flow with both proxies in its assigned pair. Other proxies  
 > in the pool that receive a request for you can use the hash to find  
 > the right pair, and if either proxy in the pair has lost the flow, it  
 > knows to consult the other member of the pair.

dean,

i would really love to implement something like this, but the problem is
that because of ob draft you cannot assume that "UA will then end up
registering to and forming a flow with both proxies in its assigned
pair".  

in order cope with proxy failure, you must then play with all kinds
tricks to make the still working proxy in the pair to assume the ip
address and (in case of tcp) the flows of the dead proxy, which is not
easy at all.

-- juha
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