[tor-bugs] #965 [Tor - Tor client]: Redo DNS tests

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#965: Redo DNS tests
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 Reporter:  Sebastian           |         Type:  defect          
   Status:  new                 |     Priority:  minor           
Milestone:  Tor: 0.2.2.x-final  |    Component:  Tor - Tor client
  Version:  0.2.1.13-alpha      |   Resolution:  None            
 Keywords:  easy                |       Parent:                  
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Comment(by mwenge):

 DNS tests are cheap for relays.

 If a relay becomes an exit, and it has never performed DNS testing, it
 can't test DNS quickly enough - it will inevitably upload a descriptor
 that may need revision very soon after. So disabling DNS testing for non-
 exits will definitely result in extra descriptor churn.

 If you're not disabling DNS checking for non-exits there's not much
 benefit to checking it when they become exits - unless ISPs are changing
 their hijacking policies every day.

 Tor already performs DNS checking again when your IP changes.

 It's hard to see the defect here - any 'fix' is to the detriment of Tor's
 network load and a few DNS queries every 12-24 hours cannot be hurting
 non-exits.

 Resolve as 'wontfix'?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/965#comment:3>
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