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[tor-talk] relay ACK scans
i have an iptables firewall rule to log and drop ACK scans and it was
unusual to see that each of the 4 connected relays at that particular
moment (a few minutes after logging into the desktop GUI) all attempted
an ACK scan in lots of 6 attempts almost precisely 2 minutes apart -
omitted the relay IP's
Dec 17 02:38:12 kernel: [ 153.563425] [Drop] ACK scan:
Dec 17 02:38:20 kernel: [ 160.905773] [Drop] ACK scan:
Dec 17 02:38:25 kernel: [ 166.220964] [Drop] ACK scan:
Dec 17 02:38:29 kernel: [ 170.213327] [Drop] ACK scan:
Dec 17 02:40:10 kernel: [ 270.758473] [Drop] ACK scan:
Dec 17 02:40:19 kernel: [ 279.892578] [Drop] ACK scan:
Dec 17 02:40:26 kernel: [ 286.234685] [Drop] ACK scan:
Dec 17 02:40:29 kernel: [ 289.965468] [Drop] ACK scan:
Dec 17 02:42:10 kernel: [ 390.447814] [Drop] ACK scan:
Dec 17 02:42:19 kernel: [ 399.580929] [Drop] ACK scan:
Dec 17 02:42:26 kernel: [ 406.248149] [Drop] ACK scan:
Dec 17 02:42:30 kernel: [ 409.972448] [Drop] ACK scan:
Dec 17 02:44:10 kernel: [ 510.135013] [Drop] ACK scan:
Dec 17 02:44:19 kernel: [ 519.269133] [Drop] ACK scan:
Dec 17 02:44:26 kernel: [ 526.260980] [Drop] ACK scan:
Dec 17 02:44:30 kernel: [ 529.980302] [Drop] ACK scan:
Dec 17 02:46:10 kernel: [ 629.822953] [Drop] ACK scan:
Dec 17 02:46:19 kernel: [ 638.957732] [Drop] ACK scan:
Dec 17 02:46:27 kernel: [ 646.275473] [Drop] ACK scan:
Dec 17 02:46:30 kernel: [ 649.987220] [Drop] ACK scan:
Dec 17 02:48:10 kernel: [ 749.512538] [Drop] ACK scan:
Dec 17 02:48:19 kernel: [ 758.646298] [Drop] ACK scan:
Dec 17 02:48:27 kernel: [ 766.286965] [Drop] ACK scan:
Dec 17 02:48:31 kernel: [ 769.995298] [Drop] ACK scan:
i've not seen this before in logs
i noticed recently the number of established connections to relays is up
from 3 to 4
i have this Tor version 0.2.4.19 (git-9a83ee5e4d3cece4)
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