[tor-bugs] #27286 [Core Tor/Tor]: Update recommended and required protocol versions for "LinkAuth"

[Tor Bug Tracker & Wiki]

#27286: Update recommended and required protocol versions for "LinkAuth"
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
                                                 |  merge_ready
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  032-backport 033-backport            |  Actual Points:
  034-backport                                   |
Parent ID:  #26631                               |         Points:
 Reviewer:  teor                                 |        Sponsor:
                                                 |  Sponsor8
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Comment (by arma):

 To make sure I understand: (a) does that mean that nss-based Tor clients
 won't be able to establish a link connection to 0.2.9 relays or bridges?
 Since quite a few of the big relays are still on 0.2.9 -- including guards
 -- that limitation could be a big deal. Specifically, of the 1919 guards,
 it looks like 345 of them are on 0.2.9. I guess we figure nss-based
 clients won't be that relevant for another couple of years, by which point
 0.2.9 will be dying away?

 And (b) it seems weird to say that we support a version if, when you run
 it, it tells you to upgrade. I guess the choice is between "be able to
 implement newer client variants and not be disobeying our spec" vs "have
 existing versions that we claim to support tell people that they need to
 upgrade"?

 If it really is a choice between these two, is there any rush to push
 through the "start warning" part?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27286#comment:6>
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