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[tor-bugs] #3852 [- Select a component]: allow 'selective' DNS resolution using particular DNS server(s) with tor

#3852: allow 'selective' DNS resolution using particular DNS server(s) with tor
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 Reporter:  mr-4                  |          Owner:     
     Type:  enhancement           |         Status:  new
 Priority:  normal                |      Milestone:     
Component:  - Select a component  |        Version:     
 Keywords:                        |         Parent:     
   Points:                        |   Actualpoints:     
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 I use tor's internal DNS resolution scheme a lot on a machine on which I
 have a host of other applications, including a BT client.

 The issue I am continually facing, however, is that I constantly run
 across a group of trackers, on which I cannot resolve/use name->ip address
 resolution unless the request is addressed to a particular set of DNS
 server or servers (OpenDNS is a prime example of this).

 Currently, there is no way I could 'force' tor to use a particular set of
 DNS servers for address resolution of a particular host or hosts.

 It would be nice if I could add an option in torrc, similar to the '.exit'
 address mapping, but made for dns resolution. A simple example would be
 this:

 MapDNS tracker.ccc.de.208.67.222.222

 In the above example when a dns request is received by tor for
 'tracker.ccc.de', this request is then 'redirected' (probably via exit
 node, which would be, I assume, different most of the time) for dns
 resolution to 208.67.222.222 (OpenDNS) and then when a response is
 received it is then passed on to the requesting application.

 I don't pretend to know the tor inner workings and can't judge whether the
 above is doable or not, but it would be nice to specify a particular set
 of DNS server (or servers) to be used for dns resolution for a particular
 name(s), thus avoiding the problem I described above.

 Many thanks!

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3852>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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