Reference Guide

excluded them from the VTY line with a deny-all access class. After users identify themselves, FTOS retrieves the
access class from the local database and applies it. (FTOS then can close the connection if a user is denied access.)
NOTE: If a VTY user logs in with RADIUS authentication, the privilege level is applied from the RADIUS server only if
you configure RADIUS authentication.
The following example shows how to allow or deny a Telnet connection to a user. Users see a login prompt even if they
cannot log in. No access class is configured for the VTY line. It defaults from the local database.
NOTE: For more information, refer to Access Control Lists (ACLs).
Example of Configuring VTY Authorization Based on Access Class Retrieved from a Local Database (Per User)
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
VTY Line Remote Authentication and Authorization
FTOS retrieves the access class from the VTY line.
The Dell Networking operating system (FTOS) 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 set to deny all or deny for the incoming subnet, FTOS 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)
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.
Example of Configuring VTY Authorization Based on MAC ACL for the Line (Per MAC Address)
FTOS(conf)#mac access-list standard sourcemac
FTOS(config-std-mac)#permit 00:00:5e:00:01:01
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