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Re: [tor-bugs] #3535 [Tor Client]: Relax IsolateDestAddr rules to handle hostname/ip distinction

#3535: Relax IsolateDestAddr rules to handle hostname/ip distinction
-------------------------+--------------------------------------------------
 Reporter:  nickm        |          Owner:  nickm             
     Type:  enhancement  |         Status:  accepted          
 Priority:  normal       |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Client   |        Version:                    
 Keywords:               |         Parent:  #1865             
   Points:               |   Actualpoints:                    
-------------------------+--------------------------------------------------

Comment(by arma):

 Replying to [ticket:3535 nickm]:
 > The current prop171 branch takes a simplistic view of isolating streams
 by destination address, and treats any two addresses as equal only if they
 equal in a case-insensitive string comparison.  But if address A has
 resolved to IP B, then perhaps we don't want to isolate future requests
 for A and B onto separate circuits.

 If the user actually asks for destinations A and B and they are different,
 we should respect the isolation requests. I think it's only where the user
 asks for destination A and then asks for destination A again later, and in
 between the Tor client has cached the resolve and does a remap for the
 second request, that we should realize they're the same.

 I could imagine recognizing that they're the same by crawling the
 mapaddresses, or by just remembering the "originally requested address"
 somewhere in the stream and consulting that when considering isolation.

 > There may also be other circumstances like this, such as where hostname
 A and hostname B are both known to resolve to IP C.

 Open research question whether that's a good idea. So I think it should
 default to "no, keep those separate" until somebody gives us a better
 intuition.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3535#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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