Normally, router's settings are password protected to avoid undesired changes.
Usually the manufacturer provides routers with their own factory settings.
TP-LINK ships its routers with the following default parameters:
The default IP Address to use to connect to the routers is 192.168.1.1
The default netmask for the address is 255.255.255.0
so to connect to the router IP, the address of your computer must be in the same subnet with the device. It means that your computer should have an IP address 192.168.1.X (X is in range of 2~253)
The default user is "admin" and the related password is "admin "
If you have lost your password you can reset the device, and so you can login again in the router using the above username and password.
To reset the router use the following instructions (as specified in the tp-link web site):
Turn off the modem (pull the power out of the unit ).
Press and hold the reset button on the rear panel with a pin, while holding down the reset button turn on the modem (plug the power back into the unit). It is important that you continue to hold down the reset button for approximately 15 seconds.
Step 3 Release the reset button and wait for the device to reboot.
NOTE: If you reset the device, the device will return to factory defaults, you will lose all your settings.