Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 776
RADIUS, RADIUS Authentication, Idle Time
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| | Use the ^ and v keys to select which entry is highlighted. Press enter to boot the selected OS, 'e' to edit the commands before booting or 'c' for a command-line. RADIUS Remote authentication dial-in user service (RADIUS) is a distributed client/server protocol. This protocol transmits authentication, authorization, and configuration information between a central RADIUS server and a RADIUS client (the Dell Networking system). The system sends user information to the RADIUS server and requests authentication of the user and password. The RADIUS server returns one of the following responses: • Access-Accept - the RADIUS server authenticates the user. • Access-Reject - the RADIUS server does not authenticate the user. If an error occurs in the transmission or reception of RADIUS packets, you can view the error by enabling the debug radius command. Transactions between the RADIUS server and the client are encrypted (the users' passwords are not sent in 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 Authentication Dell Networking OS supports RADIUS for user authentication (text password) at login and can be specified as one of the login authentication methods in the aaa authentication login command. When configuring AAA authorization, you can configure to limit the attributes of services available to a user. When you enable authorization, the network access server uses configuration information from the user profile to issue the user's session. The user's access is limited based on the configuration attributes. RADIUS exec-authorization stores a user-shell profile and that is applied during user login. You may name the relevant named-lists with either a unique name or the default name. When you enable authorization by the RADIUS server, the server returns the following information to the client: • Idle Time • ACL Configuration Information • Auto-Command • Privilege Levels After gaining authorization for the first time, you may configure these attributes. NOTE: RADIUS authentication/authorization is done for every login. There is no difference between first-time login and subsequent logins. Idle Time Every session line has its own idle-time. If the idle-time value is not changed, the default value of 30 minutes is used. RADIUS specifies idle-time allow for a user during a session before timeout. When a user logs in, the lower of the two idle-time values (configured or default) is used. The idle-time value is updated if both of the 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. 776 Security
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