the default firmware doesn’t provide the SSH feature, however, with the help of padavan‘s rt-n56u project, you may enable it:
This project aims to improve the rt-n56u and other supported devices on the software part, allowing power user to take full control over their hardware. This project was created in hope to be useful, but comes without warranty or support. Installing it will probably void your warranty. Contributors of this project are not responsible for what happens next.
login to the router setting dashboard, and upgrade the firmware by selecting the downloaded file.
after couple minutes, my router reset, I connect to the router via cable, and setup wifi. (you may try ‘1234567890’ to connect to your wifi network if you cannot connect to it directly)
login to the router setting dashboard, you’ll find a new UI! navigate to: Advanced Settings > Administration > Services to setup your ssh server. more details: https://bitbucket.org/padavan/rt-n56u/wiki/EN/CommonTips