[tor-bugs] #29725 [Core Tor/sbws]: Reset relay bandwidths when their IPv6 address changes

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#29725: Reset relay bandwidths when their IPv6 address changes
---------------------------+-----------------------------------
 Reporter:  juga           |          Owner:  (none)
     Type:  defect         |         Status:  closed
 Priority:  Medium         |      Milestone:  sbws: 1.2.x-final
Component:  Core Tor/sbws  |        Version:  sbws: 1.0.5
 Severity:  Normal         |     Resolution:  wontfix
 Keywords:  scanner        |  Actual Points:
Parent ID:  #29954         |         Points:  1
 Reviewer:                 |        Sponsor:
---------------------------+-----------------------------------
Changes (by teor):

 * status:  new => closed
 * resolution:   => wontfix


Comment:

 Replying to [comment:5 juga]:
 > Replying to [comment:3 teor]:
 > > Actually, I don't think we should make this change for IPv6, because
 it will penalise relays that use IPv6 address privacy extensions.
 >
 > sorry, i'm not familiar with IPv6. You mention "IPv6" and "IPv6 address
 privacy extensions". Is it the  "IPv6 address privacy extensions" a subset
 of "IPv6"?, or is it the same set?.

 IPv6 is a way for relays to connect to each other, and clients to connect
 to relays, like IPv4.

 Some relays have an IPv6 address, all relays have an IPv4 address.

 Some IPv6 addresses use "IPv6 privacy extensions". IPv6 privacy extensions
 can make some relays change their IPv6 address every day, or every week.

 > >
 > > IPv6 address privacy extensions make some machines change their IPv6
 address regularly. (By default, once per day, with old addresses lasting
 one week). The rest of the tor network copes well with address changes at
 that rate. (See https://tools.ietf.org/html/rfc4941#section-3.5 .)
 > >
 > > But if we make this change on bandwidth authorities, they will reset
 the bandwidth of relays that use IPv6 address privacy extensions, every
 day. Since sbws only measures the whole network once per day, any relay
 that uses IPv6 address privacy extensions won't get much consensus weight.
 >
 > Yeah, this sounds like a problem.
 >
 > >
 > > If we don't make this change, then when relays change networks, sbws
 will take a few days to measure their new bandwidth. That's ok. Network
 changes happen a lot less often than IPv6 privacy extensions address
 changes.
 >
 > Not sure what you mean by "network changes"

 Relays moving from one network to another network.


 > > If sbws can ever scan the network once per hour, we could think about
 implementing this change.
 > >
 > > What do you think, juga? Should we close this ticket?
 >
 > Given my little knowledge about IPv6, you can probably have a better
 opinion here :)

 Ok, I'll close this ticket.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29725#comment:6>
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