Transmission is a file sharing program.

When you run a torrent, its data will be made available to others by means of upload.

Any content you share is your sole responsibility.

Optware-NG version here

This version works on all supported routers: RT-N16, RT-N66U, RT-AC66U, RT-AC56U, RT-AC68U, RT-AC87U, RT-AC88U, RT-AC3200, RT-AC5300...

1 - Install Entware-NG from here

2 - Install transmission

opkg install transmission-web transmission-daemon-openssl transmission-remote-openssl
3 - Stop transmission

/opt/etc/init.d/S88transmission stop
4 - Backup standard file settings and create a new optimized one:

mv /opt/etc/transmission/settings.json /opt/etc/transmission/settings.json.backup
cat >> /opt/etc/transmission/settings.json << 039;EOF039;
{
"alt-speed-down": 50,
"alt-speed-enabled": false,
"alt-speed-time-begin": 540,
"alt-speed-time-day": 127,
"alt-speed-time-enabled": false,
"alt-speed-time-end": 1020,
"alt-speed-up": 50,
"bind-address-ipv4": "0.0.0.0",
"bind-address-ipv6": "::",
"blocklist-enabled": true,
"blocklist-url": "https://list.iblocklist.com/?list=bt_level1",
"cache-size-mb": 2,
"dht-enabled": true,
"download-dir": "/tmp/mnt/sda1/Transmission",
"download-queue-enabled": true,
"download-queue-size": 3,
"encryption": 0,
"idle-seeding-limit": 180,
"idle-seeding-limit-enabled": true,
"incomplete-dir": "/tmp/mnt/sda1/Transmission/Incomplete",
"incomplete-dir-enabled": false,
"lazy-bitfield-enabled": true,
"lpd-enabled": false,
"message-level": 2,
"open-file-limit": 5,
"peer-congestion-algorithm": "",
"peer-id-ttl-hours": 6,
"peer-limit-global": 80,
"peer-limit-per-torrent": 30,
"peer-port": 51413,
"peer-port-random-high": 65535,
"peer-port-random-low": 49152,
"peer-port-random-on-start": false,
"peer-socket-tos": "default",
"pex-enabled": true,
"pidfile": "/var/run/transmission-daemon.pid",
"port-forwarding-enabled": true,
"preallocation": 1,
"prefetch-enabled": 1,
"proxy": "",
"proxy-auth-enabled": false,
"proxy-auth-password": "",
"proxy-auth-username": "",
"proxy-enabled": false,
"proxy-port": 80,
"proxy-type": 0,
"queue-stalled-enabled": true,
"queue-stalled-minutes": 300,
"ratio-limit": 7,
"ratio-limit-enabled": true,
"rename-partial-files": true,
"rpc-authentication-required": true,
"rpc-bind-address": "0.0.0.0",
"rpc-enabled": true,
"rpc-password": "admin",
"rpc-port": 9091,
"rpc-url": "/transmission/",
"rpc-username": "admin",
"rpc-whitelist": "*.*.*.*",
"rpc-whitelist-enabled": false,
"scrape-paused-torrents-enabled": true,
"script-torrent-done-enabled": false,
"script-torrent-done-filename": "",
"seed-queue-enabled": false,
"seed-queue-size": 10,
"speed-limit-down": 100,
"speed-limit-down-enabled": false,
"speed-limit-up": 100,
"speed-limit-up-enabled": false,
"start-added-torrents": true,
"trash-original-torrent-files": false,
"umask": 0,
"upload-slots-per-torrent": 10,
"utp-enabled": false,
"watch-dir": "/opt/etc/transmission/watchdir",
"watch-dir-enabled": true
}
EOF
Press ENTER
5 - Start transmission daemon

/opt/etc/init.d/S88transmission start
6 - Open transmission webpage by going to default router ip address and port 9091, ex. 192.168.1.1:9091 (username: admin and password: admin)
The default download folder is on /mnt/sda1/Transmission (will be created automatically with the first downloaded torrent and can be changed editing settings.json file) if your usb disk has a label, change sda1 with the disk label. Be sure transmission-daemon is not running or changes will be overwritten!!!

/opt/etc/init.d/S88transmission stop
7 - With nano you can edit any settings like enable / change username, password:

nano /opt/etc/transmission/settings.json
8 - Save settings with CTRL-O, press ENTER and exit nano with CTRL-X, now start transmission again

/opt/etc/init.d/S88transmission start
9 - Create init-start script for some memory tweaks as suggested by ryzhov_al

nano /jffs/scripts/init-start
#!/bin/sh
echo 524288 > /proc/sys/net/core/rmem_max
echo 524288 > /proc/sys/net/core/wmem_max
echo 8192 > /proc/sys/vm/min_free_kbytes

Save with CTRL-O, press ENTER and exit nano with CTRL-X

Make scripts executable

chmod a+rx /jffs/scripts/*

ACCESS FROM WAN
• If you want to access transmission from WAN like work, school, smartphone, tablet or some other device we need to open the port 9091 but the firmware doesn039;t allow port forwarding to the router himself, for that we will use firewall-start script on /jffs partition:

Create firewall rules

nano /jffs/scripts/firewall-start
Paste this lines in terminal

#!/bin/sh

iptables -I INPUT -p tcp --destination-port 9091 -j ACCEPT
iptables -I INPUT -p tcp --destination-port 51413 -j ACCEPT
iptables -I INPUT -p udp --destination-port 51413 -j ACCEPT

Save with CTRL-O / Enter / and exit with CTRL-X
Make scripts executable and apply rules

chmod a+rx /jffs/scripts/*
sh /jffs/scripts/firewall-start
Go to YourWanIp:9091 on preferred internet browser or install Transmission Remote GUI

opkg remove transmission-web
opkg install transmission-web-control
opkg install mc