Zyxel N4100 - Manual (Page 11)

ENGLISH
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4. Select Yes to be able to create and use subscriber accounts that are
used to authenticate clients connecting to the Internet. This wizard
configures authentication and accounting settings for the N4100's
built-in local subscriber database. Use the advanced RADIUS setup
screen to use an external RADIUS server instead (see the User's
Guide for details).
5. Set the type of accounting to use. Set up Internet access time periods
and their prices.