[tor-talk] understanding metrics bw graphs

Nusenu BM-2D8wMEVgGVY76je1WXNPfo8SrpZt5yGHES at bitmessage.ch
Mon Aug 4 23:33:12 UTC 2014


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>> I would have a question regarding the bw-flags graphs on
>> metrics.tpo [1]
>> 
>> "guard bw history" a) Does this include the entire accumulated
>> traffic of relays having the guard flag? (which would include the
>> traffic of a guard relay acting as a middle or exit relay - if it
>> also has the exit flag)
>> 
>> or
>> 
>> b) Does this only and exclusively include the entire accumulated 
>> traffic that *enters* the tor network via all guard relays? (to
>> actually do that the traffic accounting on relays would have to
>> do accounting accordingly on a per connection type level)
> 
> a) is correct.
> 

Thanks for your answer.

>> Which would bring me to the next question (which would be
>> required to actually do the required accounting for (b)): Is a
>> relay able to tell whether it is being used as first or second
>> hop solely by looking at packets (not their source)?
> 
> Looking at the packet source and comparing it to the list of known 
> relays would probably be the most reliable way for counting bytes
> as first or second hop.  But this is not implemented, and there are
> plans to implement this, to the best of my knowledge.

If relays are unable to tell in which position they are used, how does
AllowSingleHopExits work? I guess by simple checking if the client IP
matches an IP in the consensus?
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