[tor-relays] why are some exit IPs missing from Exit IP DB?

[Tim Wilson-Brown - teor]

> On 11 Oct 2015, at 22:27, nusenu <nusenu at openmailbox.org> wrote:
> 
>> Occasionally I run into a relay such as
>> 
>> Bywadu 5A0DE94C95E2276B4BAC974A7D8FC6463C4FE8A4
>> 
>> OR ip 178.33.157.6
>> 
>> exit ip 31.7.58.37
>> 
>> Where the egress/exit IP source address is
>> not found in the Exit DB, shows up negative
>> on ExoneraTor.  TorCheck in glaring unhappy RED
>> spits
>> 
>>>> Something Went Wrong!
>>>> Tor is not working in this browser.
>>>> For assistance, please contact help at rt.torproject.org.
>> Does anyone know why this happens?
> 
> 
> Such "non declared" exit IP addresses (OR IP != exit IP) are found by
> exiting through every single exit relay to detect its exit IP.
> 
> Since exits can change their exit IP address at any time the exit list
> can never be 100% accurate by design.
> 
> https://collector.torproject.org/formats.html#exit-lists <https://collector.torproject.org/formats.html#exit-lists>

Isn't this a bug in TorCheck?
It assumes that every relay has its ORPort IP as its Exit IP (OutboundBindAddress), and most likely also assumes that each exit only has one IP.

Tim


Tim Wilson-Brown (teor)

teor2345 at gmail dot com
PGP 968F094B

teor at blah dot im
OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F

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