If you can not access to your router web-based interface. then you may try to access it using your default IP of your network. If you know what IP of your router belongs to you, using the default IP of your network is very easy. No need to operate the router to set this IP for you. You just need to visit any computer, select your device and press Enter. Then you can enter the router's IP. Now you can login to your router with these login credentials.
Most of the time users allows you to change the IP of your router however this limit is not the same for all Alcatel-Lucent routers. If you are traveling in a different city and you want to change your IP for your router to connect to Internet then you should check the IP range of your current location. You can find it by accessing the IP of your router. By this you can check the IP range of your location. If you were traveling from city A to city B then check whether it is possible to change your IP to city B. If you can't see the IP range then you can try searching for your device on the internet by putting City B, State (for example) and device model name of your Alcatel-Lucent routers (Ex. @RG200E-CA)
If you can't access to the router's password and username then you can try to change the password, it just takes few seconds. All you need to do is select Change Password and then enter a new password. d2c66b5586