My router device is D-link Dir-300 NRU150 and its firmware does not come with the option to reboot the router. Sometimes you need to reboot your device to fix connection issues or network speed performance. While you can always disconnect the power supply, that might not be very convenient as your router might not be near you or it might be in some location which is hard to access. Here is an alternative way.
Raspberry Pi is the world's most popular card-sized development board SoC which can handle many Linux distributions. It can be used for a wide range of tasks, from being a personal PC or a media center PC to micro controllers programming or building robots. As of this writing, Raspberry Pi exists in three editions: top Raspberry Pi 2, middle Raspberry Pi B+ and the low end Raspberry Pi A+. If you are interested in Raspberry Pi B+, here is a good news for you - the price for this board is $25.