Источник: https://www.adminsehow.com/2015/05/block-torrent-trackers-on-linux/

Создаём файл /etc/trackers

9.rarbg.com
announce.torrentsmd.com
bigfoot1942.sektori.org
bt.careland.com.cn
bttrack.9you.com
bttracker.crunchbanglinux.org
coppersurfer.tk
explodie.org
i.bandito.org
mgtracker.org
open.demonii.com
opensharing.org
torrent.fedoraproject.org
torrent.gresille.org
tracker.best-torrents.net
tracker.blucds.com
tracker.btzoo.eu
tracker.coppersurfer.tk
tracker.dler.org
tracker.istole.it
tracker.leechers-paradise.org
tracker.nwps.ws
tracker.openbittorrent.com
tracker.publicbt.com
tracker.tfile.me
tracker1.wasabii.com.tw

Создаём скрипт /usr/bin/blocktrackers

#!/bin/bash
 
IFS=$'\n'
L=$(/usr/bin/sort /etc/trackers | /usr/bin/uniq)
for fn in $L; do
        /sbin/iptables -D INPUT   -d $fn -j DROP -m comment --comment "Tracker"
        /sbin/iptables -D FORWARD -d $fn -j DROP -m comment --comment "Tracker"
        /sbin/iptables -D OUTPUT  -d $fn -j DROP -m comment --comment "Tracker"
        /sbin/iptables -A INPUT   -d $fn -j DROP -m comment --comment "Tracker"
        /sbin/iptables -A FORWARD -d $fn -j DROP -m comment --comment "Tracker"
        /sbin/iptables -A OUTPUT  -d $fn -j DROP -m comment --comment "Tracker"
done

Делаем файл исполняемым и добавляем в cron

Источник: http://blog.asidorov.name/2015/02/iptables.html

# iptables -I FORWARD 1 -m string --string "BitTorrent" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "BitTorrent protocol" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "peer_id=" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string ".torrent" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "announce.php?passkey=" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "torrent" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "announce" --algo bm --to 65535 -j DROP
# iptables -I FORWARD 1 -m string --string "info_hash" --algo bm --to 65535 -j DROP

# iptables -L FORWARD -vn --line-numbers
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         
1       95 24353 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "info_hash" ALGO name bm TO 65535
2       28 40328 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "announce" ALGO name bm TO 65535
3       16   912 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "torrent" ALGO name bm TO 65535
4        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "announce.php?passkey=" ALGO name bm TO 65535
5        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  ".torrent" ALGO name bm TO 65535
6        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "peer_id=" ALGO name bm TO 65535
7       95 12940 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "BitTorrent protocol" ALGO name bm TO 65535
8        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0            STRING match  "BitTorrent" ALGO name bm TO 65535