The router has a default username of “admin” and no password when new. The username and password are required when accessing the router’s web and telnet interfaces.
For security you should change the password as soon as possible.

Vigor Router
To change the password, go to “System Maintenance>>Administrator Password Setup” configuration menu page as shown below:

Vigor3300V Router
Go to “System>>Change Password” configuration menu page as shown below and enter the new password when prompted: