Re: [tor-talk] understanding metrics bw graphs

[Karsten Loesing <karsten@xxxxxxxxxxxxxx>]

On 04/08/14 21:15, Karsten Loesing wrote:
> On 31/07/14 23:44, Nusenu wrote:
>> Hi,
>>
>> 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.
> 
> Minor nitpick: a relay can exit even if it doesn't have the Exit flag;
> that flag is only assigned for load-balancing purposes.
> 
> There's no data available for b).
> 
>> 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.

Erm, "there are *no* plans to implement this" is what I meant to say there.

>> Same question applies to: "exit bw history"
> 
> a).
> 
>> Does your answer also apply to [2]?
> 
> Yes, except that [2] distinguishes between Guard only and Guard & Exit.
> 
> All the best,
> Karsten
> 
>> [1] https://metrics.torproject.org/bandwidth.html#bandwidth-flags
>>
>> [2] https://metrics.torproject.org/bandwidth.html#bwhist-flags
> 

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