Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 645

Figure 35-13. Example Access-Class Configuration Using Local Database Force10(conf)#user gooduser password abc privilege 10 access-class permitall Force10(conf)#user baduser password abc privilege 10 access-class denyall Force10(conf)# Force10(conf)#aaa authentication login localmethod local Force10(conf)# Force10(conf)#line vty 0 9 Force10(config-line-vty)#login authentication localmethod Force10(config-line-vty)#end Note: See also the section Chapter 7, Access Control Lists (ACL), Prefix Lists, and Route-maps. VTY Line Remote Authentication and Authorization FTOS retrieves the access class from the VTY line. The Dell Force10 OS takes the access class from the VTY line and applies it to ALL users. FTOS 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, FTOS immediately applies it. If the access-class is deny all or deny for the incoming subnet, FTOS closes the connection without displaying the login prompt. Figure 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. Figure 35-14. Example Access Class Configuration Using TACACS+ Without Prompt Force10(conf)#ip access-list standard deny10 Force10(conf-ext-nacl)#permit 10.0.0.0/8 Force10(conf-ext-nacl)#deny any Force10(conf)# Force10(conf)#aaa authentication login tacacsmethod tacacs+ Force10(conf)#tacacs-server host 256.1.1.2 key force10 Force10(conf)# Force10(conf)#line vty 0 9 Force10(config-line-vty)#login authentication tacacsmethod Force10(config-line-vty)# Force10(config-line-vty)#access-class deny10 Force10(config-line-vty)#end (same applies for radius and line authentication) VTY MAC-SA Filter Support FTOS supports MAC access lists which permit or deny users based on their source MAC address. With this approach, you can implement a security policy based on the source MAC address. To apply a MAC ACL on a VTY line, use the same access-class command as IP ACLs (Figure 35-15). Figure 35-15 shows how to deny incoming connections from subnet 10.0.0.0 without displaying a login prompt. Security | 645