[tor-bugs] #1035 [Tor Relay]: Relay on dynamic IP marked as stable and guard

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#1035: Relay on dynamic IP marked as stable and guard
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    Reporter:  rudis      |       Owner:  Sebastian         
        Type:  defect     |      Status:  reopened          
    Priority:  minor      |   Milestone:  Tor: 0.2.2.x-final
   Component:  Tor Relay  |     Version:  0.2.0.35          
  Resolution:             |    Keywords:                    
      Parent:             |      Points:                    
Actualpoints:             |  
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Comment(by rransom):

 Replying to [comment:35 BarkerJr]:
 > I think this bug needs to be reopened and revisited.  The stability of a
 router is not impacted by an IP or port change.  The connections to the
 old IP/port remain active.  The point of the Stable flag is not if a
 router is reachable, but instead if long-running transactions get broken.

 A change in IP address and/or port clearly affects the WFU (weighted
 fractional uptime) that clients will experience, so the authorities should
 consider it in their calculation of WFU (and in their decision as to
 whether to assign the Guard flag).

 We should assign the Stable flag based on MTBF (mean time between
 failures), but we cannot easily measure that.  If you know how to improve
 our measurement of MTBF, patches welcome.  (A specification of a good
 algorithm would be helpful, too.)

 However, most events that will cause a relay to change its IP address
 ''do'' cause all of its connections to break, so IP address changes will
 still need to be counted against a relay's MTBF.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1035#comment:38>
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