If an error occurs in the transmission or reception of RADIUS packets, you can view the error by enablingthe debug radius command.Transactions between the RADIUS server and the client are encrypted (the users’ passwords are not sentin plain text). RADIUS uses UDP as the transport protocol between the RADIUS server host and the client.For more information about RADIUS, refer to RFC 2865, Remote Authentication Dial-in User Service.RADIUS AuthenticationDell Networking OS supports RADIUS for user authentication (text password) at login and can bespecified as one of the login authentication methods in the aaa authentication login command.Idle TimeEvery session line has its own idle-time. If the idle-time value is not changed, the default value of 30minutes is used.RADIUS specifies idle-time allow for a user during a session before timeout. When a user logs in, thelower of the two idle-time values (configured or default) is used. The idle-time value is updated if both ofthe following happens:• The administrator changes the idle-time of the line on which the user has logged in.• The idle-time is lower than the RADIUS-returned idle-time.ACL Configuration InformationThe RADIUS server can specify an ACL. If an ACL is configured on the RADIUS server, and if that ACL ispresent, the user may be allowed access based on that ACL.If the ACL is absent, authorization fails, and a message is logged indicating this.RADIUS can specify an ACL for the user if both of the following are true:• If an ACL is absent.• If there is a very long delay for an entry, or a denied entry because of an ACL, and a message islogged.NOTE: The ACL name must be a string. Only standard ACLs in authorization (both RADIUS andTACACS) are supported. Authorization is denied in cases using Extended ACLs.Auto-CommandYou can configure the system through the RADIUS server to automatically execute a command whenyou connect to a specific line.The auto-command command is executed when the user is authenticated and before the promptappears to the user.• Automatically execute a command.auto-commandPrivilege LevelsThrough the RADIUS server, you can configure a privilege level for the user to enter into when theyconnect to a session.This value is configured on the client system.Security 711
