Routers protect their web interfaces, where you can configure their networking, parental control, and port forwarding settings, with a username and password. These default passwords can be changed to protect the router’s settings.
If you’ve forgotten a router’s password – or if you acquired a used router and don’t know its password – there’s a way to reset the password. You may also be able to forward ports without knowing the password.
Before resetting your router to its default settings, you should first try using the default username and password to log in. You’ll need these anyway if you plan on resetting the router to its factory default settings.