I have just updated my RT-N12 D1 router to the latest firmware, and it has new function - "Added protection mechanism for GUI login brute-force attack for login username and password.". I Googled and found that most of the latest firmwares of Asus routers include this new function.
I noticed that the login GUI is totally new. After I tried to randomly wrongly login 6 times, I cannot try again, but if I open another tab in browser it works fine.
I found out if I want to use Wake-on-LAN to wake my desktop computer with this router, the only way is to login to the router control page even when I am outside. I sometimes need to wake up my computer at home, when I am at work, so if I can use Wake-on-LAN instead of turning on my desktop all the time, it saves a lot of energy, but the problem is the security of the login page.
I found out that the latest firmware may prevent brute-force attacks for login, but I am not sure how it works and how safe it is.