It's related to any modern ASUS router with USB port: RT-N10U, RT-N13U, RT-N15U, RT-N16, RT-N56U, RT-N65U, RT-N66U, RT-AC66U. All those routers uses a stock firmware partially based on TomatoUSB code, so we may use a custom start/stop scripts to ignite external services from USB drive! 1. Start/Stop scripts. There is a two script, which can be saved right into NVRAM: one will be executed right after mounting every partition on boot, another will be executed right before dismounting partition before reboot. Take a look: If you'll run it once a two scripts will be saved: one — to start Entware/Optware services form USB HDD partition labeled MYPART, second — to shutdown it gracefully. Both scripts may survive reboot. All you have to do is to choose a partition to store Entware/Optware content and format it with MYPART label, for example: Please note: a stock firmware limits execution time for this script up to 3 seconds. If you need more time, I can show how to do it later. 2. Post-firewall rules. Some services like a torrent client or SSH server needs an open port, so we need a script that will be executed after every applying of current firewall rules (e.g. in case of internet reconnection). A stock firmware got some limitation here but there is a way to open a port range: It will be equal to following firewall rules: 6881 UPD port will be opened in any case along with desired port range. 3. USB hotplug script. When firmware can't recognize an attached USB device, it may run a custom script to handle a new device. This my be useful to those who attaches a USB printer. I did not test this feature, but it looks good. Just save your usbplug-script to script_usbhotplug NVRAM variable, just like in #1.