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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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VTY Line Remote Authentication and Authorization

Dell Networking OS retrieves the access class from the VTY line.

The Dell Networking OS takes the access class from the VTY line and applies it to ALL users. Dell Networking OS does not need to know the identity of the incoming user and can immediately apply the access class. If the authentication method is RADIUS, TACACS+, or line, and you have configured an access class for the VTY line, Dell Networking OS immediately applies it. If the access-class is set to deny all or deny for the incoming subnet, Dell Networking OS closes the connection without displaying the login prompt. The following example shows how to deny incoming connections from subnet 10.0.0.0 without displaying a login prompt. The example uses TACACS+ as the authentication mechanism.

Example of Configuring VTY Authorization Based on Access Class Retrieved from the Line (Per Network Address) 

Dell(conf)#ip access-list standard deny10
                                 Dell(conf-ext-nacl)#permit 10.0.0.0/8
                                 Dell(conf-ext-nacl)#deny any
                                 Dell(conf)#
                                 Dell(conf)#aaa authentication login tacacsmethod tacacs+
                                 Dell(conf)#tacacs-server host 256.1.1.2 key Force10
                                 Dell(conf)#
                                 Dell(conf)#line vty 0 9
                                 Dell(config-line-vty)#login authentication tacacsmethod
                                 Dell(config-line-vty)#
                                 Dell(config-line-vty)#access-class deny10
                                 Dell(config-line-vty)#end
                                 (same applies for radius and line authentication)

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