[tor-bugs] #24010 [Core Tor/Torflow]: Make bandwidth authorities use DNS, not IP addresses

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#24010: Make bandwidth authorities use DNS, not IP addresses
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 Reporter:  teor              |          Owner:  aagbsn
     Type:  defect            |         Status:  new
 Priority:  High              |      Milestone:
Component:  Core Tor/Torflow  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:                    |  Actual Points:
Parent ID:  #21394            |         Points:  1
 Reviewer:                    |        Sponsor:
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Comment (by teor):

 Replying to [comment:5 micah]:
 > This strikes me as adding a potentially fragile layer to an already
 teetering edifice.
 >
 > …
 >
 > I get the point of doing this, but I am not convinced that this should
 be the role of bandwidth scanners. Bandwidth scanners should be simply
 testing the speed of the network, and nothing else. Its already overly
 complicated, even for that one task. I think DNS reachability tests are
 important, and the problem does need to be fixed, but I wonder if this
 should be done some other way. Perhaps in the client itself? I am unsure.

 If the role of bandwidth scanners is to measure bandwidth *as clients
 experience it*, then using at least some DNS is appropriate.
 We could use a mix of DNS and IP, because that's what clients do. And if
 we use a CDN as the server, it will need DNS.

 Maybe clients should give up on timed out circuits faster, I opened #24022
 for this.

 Also, exits can check their own DNS (#24014), but judging what is a slow
 resolve is hard, because it needs a comparison to other exits.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24010#comment:6>
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