Dealing with captive portals on rich web applications

1. How are captive portals implemented?
2. Why would someone use captive portal?
3. Is captive portal necessary?

How are captive portals implemented?

The captive portal technique makes the user with a Web browser (HTTP client) to see a special Web page before being granted normal Internet access. The captive portal intercepts all packets regardless of address or port, until the browser is used as a form of authentication device.

Why would someone use captive portal?

Uses. Captive portals are primarily used in open wireless networks where the users are shown a welcome message informing them of the conditions of access (allowed ports, liability, etc.). Administrators tend to do this so that their own users take responsibility for their actions and to avoid any legal responsibility.

Is captive portal necessary?

Captive portals are essential for any network structure because they provide a quick and easy way to control access to the internet and can be utilized for both employee and customer networks.