How to hack a ADSL Router ?

This is only for educational do not use it for hacking some ones router. Unauthorized access to other people router is illegal.
1. Download angry IP http://www.angryip.org/w/Download . Install it.
2.  open angry IP .On the menu bar click Tools and select Preferences
3. Click on port. on the port selection add  port:80 (just type 80)
4. Now click on display and click on host with open port only click on ok .
5. Now  you have done setting to your angry Ip now what you need is to your the IP so for that  go to www.whatismyip.com  (www.whatismyip.com) you will  see your IP address .
6. copy the IP and past it in the Ip range on angry ip  ( 120.27.89.100 to 120.27.150.200) click on start after some time it will find the open ip on port:80
7. Now just copy the IP and past it to your web browser and hit enter
 it will ask you for user name and password . now try to googel search and try to find the defult username and password for that model of router if you are lucky you will be able to hack it.
               That's all do  not miss use it.