[tor-bugs] #20092 [Applications/Tor Browser]: Rotate ports for default obfs4 bridges

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#20092: Rotate ports for default obfs4 bridges
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 Reporter:  lynntsai                  |          Owner:  tbb-team
     Type:  task                      |         Status:  needs_review
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201609R     |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by dcf):

 Replying to [comment:4 mrphs]:
 > Why removing old ports instead of just adding the new ones? I'm a bit
 concerned of removing those on port 80 and 443 as some firewalls only
 allow connections to those ports.

 That's a good point. Here's a summary of what the patch changes:
 {{{
 83.212.101.3 41213 → 50000

 154.35.22.9     80 unchanged
 154.35.22.9    443 unchanged
 154.35.22.9  60873 → 5881

 154.35.22.10    80 unchanged
 154.35.22.10   443 unchanged
 154.35.22.10 41835 → 2934

 154.35.22.11    80 unchanged
 154.35.22.11   443 unchanged
 154.35.22.11 49868 → 2413

 154.35.22.12    80 → 1894

 154.35.22.13   443 → 4319
 }}}
 In three of the six cases, 80 and 443 were already open and only the high-
 numbered port changed. I don't think we should keep the old high-numbered
 port for those. But for 154.35.22.12 and 154.35.22.13 we should probably
 add a new bridge line and keep the existing 80/443.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20092#comment:5>
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