Chapter 43 Object
ZyWALL USG Series User’s Guide
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configuring ext-group-user user objects and authentication method objects (see Chapter 43 on page
869).
43.10.1 Directory Service (AD/LDAP)
LDAP/AD allows a client (the Zyxel Device) to connect to a server to retrieve information from a
directory. A network example is shown next.
Figure 598 Example: Directory Service Client and Server
The following describes the user authentication procedure via an LDAP/AD server.
1 A user logs in with a user name and password pair.
2 The Zyxel Device tries to bind (or log in) to the LDAP/AD server.
3 When the binding process is successful, the Zyxel Device checks the user information in the directory
against the user name and password pair.
4 If it matches, the user is allowed access. Otherwise, access is blocked.
43.10.2 RADIUS Server
RADIUS (Remote Authentication Dial-In User Service) authentication is a popular protocol used to
authenticate users by means of an external server instead of (or in addition to) an internal device user
database that is limited to the memory capacity of the device. In essence, RADIUS authentication
allows you to validate a large number of users from a central location.
Figure 599 RADIUS Server Network Example
43.10.3 ASAS
ASAS (Authenex Strong Authentication System) is a RADIUS server that works with the One-Time Password
(OTP) feature. Purchase a Zyxel Device OTP package in order to use this feature. The package contains
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