Oracle Database B10772-01 Administrator's Manual page 134

Enabling RADIUS Authentication, Authorization, and Accounting
Figure 5–4 Oracle Advanced Security Authentication Window
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Step 2: Configure RADIUS on the Oracle Database Server
5-10 Oracle Database Advanced Security Administrator's Guide
Choose the Authentication tab.
From the Available Methods list, select RADIUS.
Choose the right-arrow [>] to move RADIUS to the Selected Methods list.
Move any other methods you want to use in the same way.
Arrange the selected methods in order of required usage by selecting a method
in the Selected Methods list, and clicking Promote or Demote to position it in
the list. For example, put RADIUS at the top of the list for it to be the first
service used.
Choose File > Save Network Configuration.
The sqlnet.ora file is updated with the following entry:
SQLNET.AUTHENTICATION_SERVICES=(RADIUS)
Create the RADIUS Secret Key File on the Oracle Database Server
Configure RADIUS Parameters on the Server (sqlnet.ora file)
Set Oracle Database Server Initialization Parameters