Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 888

www.dell.com | support.dell.com The following example shows how to allow or deny a Telnet connection to a user. Users will see a login prompt, even if they cannot login. No access class is configured for the VTY line. It defaults from the local database. FTOS(conf)#user gooduser password abc privilege 10 access-class permitall FTOS(conf)#user baduser password abc privilege 10 access-class denyall FTOS(conf)# FTOS(conf)#aaa authentication login localmethod local FTOS(conf)# FTOS(conf)#line vty 0 9 FTOS(config-line-vty)#login authentication localmethod FTOS(config-line-vty)#end Note: Refer also to the section Chapter 10, IP 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. VTY MAC-SA Filter Support 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. FTOS(conf)#ip access-list standard deny10 FTOS(conf-ext-nacl)#permit 10.0.0.0/8 FTOS(conf-ext-nacl)#deny any FTOS(conf)# FTOS(conf)#aaa authentication login tacacsmethod tacacs+ FTOS(conf)#tacacs-server host 256.1.1.2 key force10 FTOS(conf)# FTOS(conf)#line vty 0 9 FTOS(config-line-vty)#login authentication tacacsmethod FTOS(config-line-vty)# FTOS(config-line-vty)#access-class deny10 FTOS(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. The following example shows how to deny incoming connections from subnet 10.0.0.0 without displaying a login prompt.. FTOS(conf)#mac access-list standard sourcemac 888 | Security