what is a captive portal
A captive portal is a special web page that is shown before using the Internet normally.The portal is often used to present a login page. This is done by intercepting most packets, regardless of address or port, until the user opens a browser and tries to access the web.he portal is often used to present a login page. This is done by intercepting most packets, regardless of address or port, until the user opens a browser and tries to access the web.