Terminal Lines; Denying And Permitting Access To A Terminal Line; Configuring Login Authentication For Terminal Lines; Line Vty - Dell Force10 Z9000 Configuration Manual

Terminal Lines

You can access the system remotely and restrict access to the system by creating user profiles.
Terminal lines on the system provide different means of accessing the system. The console line (console) connects you through the
console port in the route processor modules (RPMs). The virtual terminal lines (VTYs) connect you through Telnet to the system.
The auxiliary line (aux) connects secondary devices such as modems.

Denying and Permitting Access to a Terminal Line

Dell Networking recommends applying only standard access control lists (ACLs) to deny and permit access to VTY lines.
• Layer 3 ACLs deny all traffic that is not explicitly permitted, but in the case of VTY lines, an ACL with no rules does not deny
traffic.
• You cannot use the show ip accounting access-list command to display the contents of an ACL that is applied only
to a VTY line.
To apply an IP ACL to a line, Use the following command.
• Apply an ACL to a VTY line.
LINE mode
ip access-class access-list
Example of an ACL that Permits Terminal Access
To view the configuration, use the show config command in LINE mode.
Dell(config-std-nacl)#show config
!
ip access-list standard myvtyacl
seq 5 permit host 10.11.0.1
Dell(config-std-nacl)#line vty 0
Dell(config-line-vty)#show config

line vty 0

access-class myvtyacl
Dell Networking OS Behavior: Prior to Dell Networking OS version 7.4.2.0, in order to deny access on a VTY line, apply an ACL and
accounting, authentication, and authorization (AAA) to the line. Then users are denied access only after they enter a username and
password. Beginning in Dell Networking OS version 7.4.2.0, only an ACL is required, and users are denied access before they are
prompted for a username and password.

Configuring Login Authentication for Terminal Lines

You can use any combination of up to six authentication methods to authenticate a user on a terminal line.
A combination of authentication methods is called a method list. If the user fails the first authentication method, Dell Networking OS
prompts the next method until all methods are exhausted, at which point the connection is terminated. The available authentication
methods are:
enable Prompt for the enable password.
line Prompt for the password you assigned to the terminal line. Configure a password for the terminal line to
which you assign a method list that contains the line authentication method. Configure a password using the
password command from LINE mode.
local Prompt for the system username and password.
none Do not authenticate the user.
radius Prompt for a username and password and use a RADIUS server to authenticate.
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