hello,

I have a mtnl ADSL2 D-link router. Sometime back I changed the password and now I can't remember it. Is there a way I can get my old password without resetting the router to factory default?

HI,
I never worked on D-link router , But may b bellow mentioned step can help u.

1) Boot the router , stop in maitenance or monitor mode.
2) Change the name of the file where ur configuration are stored and boot it.
3) This time u will get no configuration . Change the file name to the original one and do the configuration

Very simple. You need to reset the router. There is small button next to power pin that needs to be kept press for few seconds You may need some pointed object like needle to press the reset button. Once done then you can login with default ip i.e 192.168.1.1 and default username and password is admin/admin.
You can also call ip MTNL tech team to know the default factory password for MTNL routers.

Hope this helps in resolving your issue. Please do reply