[tor-bugs] #16303 [Tor]: Tor options to disable Authorities, IPv4, IPv6

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#16303: Tor options to disable Authorities, IPv4, IPv6
-------------------------+------------------------------------
 Reporter:  teor         |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Keywords:  tor-test     |  Actual Points:
Parent ID:               |         Points:
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 Tor already has `DisableNetwork`, an option that prevents network
 connections.

 But when testing #15775 (Fallback Directories), it would be useful to be
 able to disable connections to the authorities only. (Like the attached
 torrc.block_authorities file.) This would help us ensure bootstrap works
 without authorities. `DisableDirectDirAuthConnection`?

 When testing #8374, it could be useful to disable IPv4, so that we can
 ensure bootstrap works with only IPv6. This would be like `ClientUseIPv6`
 and `ClientPreferIPv6ORPort`, but applying strictly to the entire Tor
 process: `DisableIPv6Network`.

 And it might also be useful to disable IPv6, if IPv6 becomes active by
 default: `DisableIPv4Network`.

 This would help us cover the IPv4/IPv6 testing combinations listed at the
 bottom of:
 https://lists.torproject.org/pipermail/tor-relays/2015-June/007109.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16303>
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