ZyXEL Communications USG-100@USG-200 - V2.20 ED 2 Manual page 158

Chapter 7 Tutorials
Click Configuration > Object > AAA Server > RADIUS. Double-click the
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radius entry. Besides configuring the RADIUS server's address, authentication
port, and key; set the Group Membership Attribute field to the attribute that
the ZyWALL is to check to determine to which group a user belongs. This example
uses Class. This attribute's value is called a group identifier; it determines to
which group a user belongs. In this example the values are Finance, Engineer,
Sales, and Boss.
Figure 115 Configuration > Object > AAA Server > RADIUS > Add
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ZyWALL USG 100/200 Series User's Guide