One must take care in the design of such Tor network scanning tools to not make successive circuits through the same relays repeatedly. Instead relay pairs should be shuffled.
Yes AND if circuit building A->B fails but B->A succeeds then a subsequent A->B should also succeed. On Sun, Sep 17, 2017 at 08:11:29AM +0100, Iain R. Learmonth wrote: > Hi, > > On 17/09/17 04:56, Iain R. Learmonth wrote: > > I'll have a think about this. > > I had a little think about this. While the search strategy is something > to consider, I've hacked up a simple tool for building circuits and > detecting, at a very high level, when it fails. I don't yet have the > reason for the failure being captured. > > To give an idea, failures are not uncommon but it is far more likely > that the connections will succeed. I ran a trial with random selection > to build two hop circuits. > > The most interesting thing I've discovered so far is that it's common > for the connections to fail in one direction but then succeed when the > two relays are reversed. I can't be sure if this is because I can't > reach one of the relays. > > Thanks, > Iain. > > sqlite> select * from partitions; > 80150521E1606A3C66FBD0502417775C06E83530|91516595837183D9ECD1318D00723A8676F4731C|REV|2017-09-17 > 06:55:42 > C78AFFEEE320EA0F860961763E613FD2FAC855F5|57F5C55A6D76832400D679B4D6DCE6312CB724DD|FAIL|2017-09-17 > 06:55:58 > 721F8C234700A49C6CB42B8905719C4472698EEF|D01956B555BA59D422D994D41AC9634183974597|FAIL|2017-09-17 > 06:56:02 > A39E63BF03742663C3945E774C71AD3B6DB935C5|C7FDF95CE03E8387780F75C9CD22B9A88C956BC9|FAIL|2017-09-17 > 06:56:08 > 1C173D4513B5BA66202E02CD4F61304FD4CC6C62|F2A6F1BB8ADD47CC9CC67928EA8EA7FDB3F92533|REV|2017-09-17 > 06:56:11 > E5434A08ABDB8578C76BCDA3EECC22B5226D2CB4|77204802405A7DF1E7BD3BC579F8D1D7FB81DFD4|FAIL|2017-09-17 > 06:56:17 > A0639496103E4F0C721E4CD31BD22CC9EF94C4CE|3C79699D4FBC37DE1A212D5033B56DAE079AC0EF|REV|2017-09-17 > 06:56:19 > 80150521E1606A3C66FBD0502417775C06E83530|C7BA56FA43EA6650E1644EA05CEC3A90F559B748|REV|2017-09-17 > 06:56:21 > 273C58C7764D2718A11FB7BA2205FC147948D7FE|8F2DDD78AC99CA0CFBFAF83CA33CE87785BB12C5|FAIL|2017-09-17 > 06:56:22 > A2C2F9B652D6CFC6E0E329ED4577797CC9AD6BAB|655886ECB83A40E1BE989513D8C5C608D4B968C9|REV|2017-09-17 > 06:56:31 > 6DE375E172280727AEDCCA774D105692DEBF882A|A8A81263CB00469D98FF8E46A5A63FC4691BF3EA|REV|2017-09-17 > 06:56:41 > 88C615AC5F9591BFD48DB578B252B89A72F5C3AB|FF95E280D0DA09331EAE6B6C90F390A809D8FF9C|FAIL|2017-09-17 > 06:57:11 > C9860279669435F6F237A04CC70849A3AB2BCB3B|5CA77202F93CDD06114A2F49309805F1881AE3E8|FAIL|2017-09-17 > 06:57:25 > BA9E17048076E99AE359207A9436B7C07D1194C4|91716855ACF3C33C3EE49AAA046FA15486FDBDD5|FAIL|2017-09-17 > 06:57:26 > 7723B1B4B2B4D9D161209F770079A6F0A5A929BC|984096B174736E641F25B1B18312DA8629F1B2C4|FAIL|2017-09-17 > 06:57:48 > D4691414A1C98DD3E022A0FFB1A2E11634BD0D21|887E2B73EDA109C09ADEBD6B1E788FDF620646B7|FAIL|2017-09-17 > 06:57:51 > A07581D99FB42018B284484437DD60A0BA2BA254|8F46628BBDC55AA1065A6DB957E3A0187FD0C65F|FAIL|2017-09-17 > 06:58:04 > A9B4409C72172BF3388B72CECB3F22538131F7C6|BD4C647508162F59CB44E4DFC1C2B2B8A9387CCA|REV|2017-09-17 > 06:58:13 > 4D6F22DE54C9CC48C15E2C01D53385D05D9AF31B|3B3D1284AAE1C039D3D0FB3BBAC38F2B0775FDED|FAIL|2017-09-17 > 06:58:17 > 18046895412A1185A1F3715D5FD2987CDC8C4B91|8E7093C928C5FF8D8E854A312002A582F131728F|FAIL|2017-09-17 > 06:58:25 > A0639496103E4F0C721E4CD31BD22CC9EF94C4CE|A1D947A7751938A78FD00D971FC9098B5F397C6A|REV|2017-09-17 > 06:58:45 > D7A6E23AEFB37D241D4408598434C7A6CB36F261|549FCA8AD9A43C8289A32D7702CDEDFE47029A43|FAIL|2017-09-17 > 06:58:56 > 5CECC5C30ACC4B3DE462792323967087CC53D947|4EADA139AC7A6EB32242BE10E662D9339A228A1F|REV|2017-09-17 > 06:59:03 > 926344F6AA5FFA5B64E677929BA118FE222D2B10|A790828A47B3C5E1AA6FFA8413998F28C105E4FD|REV|2017-09-17 > 06:59:23 > 8D2F90F1E216D5F9D9AB03B8BA7BF3167DD2D859|132AC31797DC7285E365AFDF5393C11158059CBB|FAIL|2017-09-17 > 06:59:35 > 8783261406392FFD39F41AD4D8F3293460A27EFD|A58151DB952DE7821AAB96948894D937149C301B|REV|2017-09-17 > 06:59:50 > 465E967E36285F2EB7B0683E2085829803F07C31|1399C98B3A8F90ABF7ACBFED9B38EE37CA294CF6|REV|2017-09-17 > 07:00:02 > 4110885745B673A45FDF150BE1CAC01FFAD640F1|18046895412A1185A1F3715D5FD2987CDC8C4B91|FAIL|2017-09-17 > 07:00:06 > 8352FAC3EA88A399A4F2F95CE762786944E75B06|1D503952419FF24F0764762245855DF8DC73391B|FAIL|2017-09-17 > 07:00:07 > 721F8C234700A49C6CB42B8905719C4472698EEF|44B7778B1D9A17237572A61B62F4487386BF728F|FAIL|2017-09-17 > 07:00:15 > 7A665FD6A05BB8EDD5362A7E25AEEA7D1F8122DC|92FE5D1485CCDA66822964DDFE6CCF3936218653|REV|2017-09-17 > 07:00:20 > 3CF4C6996B185090A576DB2170802FE9986F0553|1C1C275B8E9F8D0824424DDFABCA488BA24756B0|FAIL|2017-09-17 > 07:00:24 > D665C959571041972EA8C0DD77559EF5579BA112|7DAF1969E80543C75369E4C88D32836487D6F09C|FAIL|2017-09-17 > 07:00:51 > 1702F6888757D679AFBEC9842F4B98E9B02B6D40|2DE827E0A349AEBE42E233F3B5ABE821321BFC8D|FAIL|2017-09-17 > 07:01:04 > 11FDAEE6B7F67B28A2BE88126625E21B467287EF|EBE1BDE602EC578A60B5EA5C84D996FA4052787B|FAIL|2017-09-17 > 07:01:18 > FB8BEE7BF2606879496317BB42D0792EAA62153A|E64625ED5B01A1F0E97BCF0B5D431A432A24F408|FAIL|2017-09-17 > 07:01:21 > _______________________________________________ > tor-relays mailing list > tor-relays@lists.torproject.org > https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
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