Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker & Wiki]

#16120: Detect if the network goes down
---+---
 Reporter:  dgoulet|  Owner:
 Type:  enhancement| Status:  new
 Priority:  Medium |  Milestone:  Tor:
Component:  Tor|  0.2.9.x-final
 Severity:  Normal |Version:
 Keywords:  network tor-guards-revamp  | Resolution:
Parent ID: |  Actual Points:
 Reviewer: | Points:  large
   |Sponsor:  SponsorU-can
---+---
Changes (by nickm):

 * keywords:  network => network tor-guards-revamp
 * severity:   => Normal


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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker & Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.8.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  network
Actual Points:   |  Parent ID:
   Points:  large|Sponsor:  SponsorU SponsorR
-+
Changes (by dgoulet):

 * points:   => large
 * sponsor:  SponsorU? => SponsorU SponsorR


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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker & Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.8.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  network
Actual Points:   |  Parent ID:
   Points:   |Sponsor:  SponsorU?
-+
Changes (by nickm):

 * sponsor:   => SponsorU?


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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker & Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.8.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  network
Actual Points:   |  Parent ID:
   Points:   |
-+

Comment (by torbacchi):

 Fixing this would really improve TBB usability: often the network may
 become unreachable for some time (lost connection to the local wi-fi, or
 the ISP uplink goes down for a while), but when it comes up again, TBB is
 having lots of trouble connecting to any site: sometimes it takes 2-3
 extra minutes, but most of the times I have to restart it (losing my
 session) :(

 BTW, maybe #1136 is related too.

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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker & Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.8.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  network
Actual Points:   |  Parent ID:
   Points:   |
-+
Changes (by dgoulet):

 * keywords:  TorCore201508 => network


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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  TorCore201508
Actual Points:   |  Parent ID:
   Points:   |
-+

Comment (by teor):

 Replying to [comment:1 arma]:
  Is this the right layer for solving the problem? How many people
 actually have their network interface go away, vs just go out of range of
 the wireless access point?
 
  I've always thought that the right approach here was to distinguish I
 seem to not be able to reach anything from I can reach some things but
 not others, which is tricky to begin with, and extra tricky when you
 consider the time component (if you can't reach anything for a while, but
 then you do reach something, you cannot learn just from that which
 situation you were in).
 
  Or to turn it around, if you build the OS-specific code to check if the
 network interface goes away, is it now any less necessary to solve the
 problems I raise above?

 For example, OS X distinguishes two cases:
 * an individual host is reachable (there's an entire API for it, see
 
https://developer.apple.com/library/mac/documentation/SystemConfiguration/Reference/SCNetworkReachabilityRef/
 )
 * an interface appears or disappears

 If there are no interfaces apart from localhost, we obviously can't get
 out.
 But if there are external interfaces, should we assume that if a certain
 set of well-known servers can't be reached, the entire network is down
 (or, we are under attack)?
 This is a common strategy, but it adds a dependency on external servers
 for proper behaviour.

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Ticket URL: https://trac.torproject.org/projects/tor/ticket/16120#comment:4
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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:  TorCore201508
Actual Points:   |  Parent ID:
   Points:   |
-+
Changes (by dgoulet):

 * keywords:   = TorCore201508


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Ticket URL: https://trac.torproject.org/projects/tor/ticket/16120#comment:3
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[tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
Component:  Tor  |Version:
 Keywords:   |  Actual Points:
Parent ID:   | Points:
-+
 Implement a way for tor to detect if the network went down. This has
 multiple use cases (see list of tickets), one for instance is being able
 to differenciate between We couldn't connect to a Guard because the Guard
 is down vs We couldn't connect because the network is down. For a more
 thorough discussion about Guard and network connectivity:
 https://lists.torproject.org/pipermail/tor-dev/2014-August/007346.html

 Furthermore, this also makes a difference when we want to either keep a
 circuit or kill it depending on if the network went down or not.

 We can get this kind of information from the OS, we need an API generic
 enough that allows us to build a compat layer for each OS. Let's also make
 sure it's integrated with the latest control command `GETINFO network-
 liveness` and the event `NETWORK_LIVENESS`.

 Tickets that could benefit from this: #8239, #12595

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Ticket URL: https://trac.torproject.org/projects/tor/ticket/16120
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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:
Actual Points:   |  Parent ID:
   Points:   |
-+

Comment (by arma):

 Is this the right layer for solving the problem? How many people actually
 have their network interface go away, vs just go out of range of the
 wireless access point?

 I've always thought that the right approach here was to distinguish I
 seem to not be able to reach anything from I can reach some things but
 not others, which is tricky to begin with, and extra tricky when you
 consider the time component (if you can't reach anything for a while, but
 then you do reach something, you cannot learn just from that which
 situation you were in).

 Or to turn it around, if you build the OS-specific code to check if the
 network interface goes away, is it now any less necessary to solve the
 problems I raise above?

--
Ticket URL: https://trac.torproject.org/projects/tor/ticket/16120#comment:1
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Re: [tor-bugs] #16120 [Tor]: Detect if the network goes down

[Tor Bug Tracker Wiki]

#16120: Detect if the network goes down
-+
 Reporter:  dgoulet  |  Owner:
 Type:  enhancement  | Status:  new
 Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
Component:  Tor  |Version:
   Resolution:   |   Keywords:
Actual Points:   |  Parent ID:
   Points:   |
-+
Changes (by yawning):

 * cc: yawning (added)


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