> Other questions I'd want to investigate: > > (A) Are the failures consistent, or intermittent? That is, does a > failed link always fail, or only sometimes?
Yes this is what our new testing methodology should support. My current scanner is not sufficient. We want to improve it. > (B) Are you really sure that it failed? I would guess that 'failed' > is different from 'timeout' because it got an explicit destroy back? > If so, don't destroy cells have 'reason' components? Which reasons are > happening most commonly? Yes I am sure it failed. It would be cool if txtorcon can expose the 'reason' but I think that it cannot. I suppose it will show up in the tor log file if I set it to debug logging. > (C) We should find a link that is failing between two relays that we > both control, and look at each one more closely to see if there are any > hints. For example, is there anything in the logs? If we turn up the > logging, do we get any hints then? Sounds good. I would certainly be willing to collaborate with Teor or anyone else who might like to help with this. > (D) ...which leads to: we should run this same tool on the test network > that teor and dgoulet et al run, and look for failures there. Assuming we > find some, since there are no users on the test network, we can investigate > much more thoroughly. Sounds good. Let me know if there is anything I can do to help with this. > (E) I wonder if there's a correlation between the failed links and > whether a TLS connection is already established on that link. That is, > when there is no connection already, there are many more steps that > need to be taken to extend the circuit, and those steps could lead to > increased failure rates, either due to the extra time that is needed, > or because part of tor's link handshake (NETINFO, etc) is going wrong. Ah yes this is another good question for which I currently do not have an answer.
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