excludeexitnodes by ip misleading when exit relay uses outboundbindaddress
In #3143 (moved) we have a user who tried to set ExcludeExitNodes with an IP address based on the address of his Tor traffic. It didn't work, because the exit relay in question exits from a different IP address than it advertises in its descriptor.
My first answer was "well, you should be excluding exit nodes by fingerprint". But that isn't a very satisfactory answer.
We could have the descriptors (and microdescriptors, ugh) or the consensus mention alternate IPs for this purpose.
It was easy for me to look up because moria1's cached-descriptor file says
@uploaded-at 2011-05-09 17:38:43 @source "126.96.36.199" router ecksnet 188.8.131.52 80 0 0
but that isn't going to be so easy for others.
There's also the tor bulk exit lists: https://metrics.torproject.org/data.html#exitlist which have this clause for the relay in question:
ExitNode 07E9456ED300CABCE2549119FE5B3CC27DA55585 Published 2011-05-10 11:39:28 LastStatus 2011-05-11 06:04:20 ExitAddress 184.108.40.206 2011-05-10 12:33:34
but that's not exactly easier for users to know about or use either.