> I would however be very interested to hear back from tor-relay operators
> if any of them have found Challenge ACK counter values higher than
> a million... which would indicate some kind of funny business.
> 
Thanky you for your work.

I know of 3 relays with ACK above 1 million:

    TCPChallengeACK: 1081146
    TCPSYNChallenge: 1062995

    TCPChallengeACK: 1270948
    TCPSYNChallenge: 1254428
  
    TCPChallengeACK: 1189549
    TCPSYNChallenge: 1171422

all running under Linux vm20198 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 
(2016-10-19) x86_64 GNU/Linux

There seems to be no relation between uptime of the server and challenges apart 
from rebooting, which resets to 0.

What about relays not on the list at all?

I would assume that not everybody of that 23 percent does know what exactly to 
do, apart from better running on BSD - could you please give detailed 
recommendation for beginners - your discussion seems on a high level :-)

Thanks and regards 

Paul
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