A captive portal is a web page accessed with a web browser that is displayed to newly connected users of a Wi-Fi network before they are granted broader access to network resources. Captive portals are commonly used to present a landing or log-in page which may require authentication, payment, acceptance of an end-user license agreement, acceptable use policy, survey completion, or other valid credentials that both the host and user agree to adhere by. Captive portals are used for a broad range of mobile and pedestrian broadband services including cable and commercially provided Wi-Fi and home hots pots. A captive portal can also be used to provide access to enterprise or residential wired networks, such as apartment houses, hotel rooms, and business centers.

The main benefits from the point of view of service providers are: Protection against unauthorized Internet access The Internet is not a secure medium. The service providers who offer connectivity services are responsible for the use being made of such access: illegal content downloads, pirating of information, etc.
And Captive portal is one of the methods of authentication supported by ArubaOS . A captive portal presents a web page which requires action on the part of the user before network access is granted. The required action can be simply viewing and agreeing to an acceptable use policy, or entering a user ID and password which must be validated against a database of authorized users.
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