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Build your private torrent tracker, PrivTracker allows to share torrent files just with your fiends, nobody else. Unlike public trackers, it shares peers only within a group which is using the same Announce URL.
(command line)
privtracker command added to NAS $PATH
once setup to make it start automatically just edit /opt/Privtracker/Privtracker.sh modifying line #./privtracker according to your need (remove # to execute with your flags)