Users Guide

TACACS+ Remote Authentication
The system takes the access class from the TACACS+ server. Access class is the class of service that restricts Telnet access and
packet sizes.
If you have congured remote authorization, the system ignores the access class you have congured for the VTY line and gets this
access class information from the TACACS+ server. The system must know the username and password of the incoming user before
it can fetch the access class from the server. A user, therefore, at least sees the login prompt. If the access class denies the
connection, the system closes the Telnet session immediately. The following example demonstrates how to congure the access-
class from a TACACS+ server. This conguration ignores the congured access-class on the VTY line. If you have congured a
deny10 ACL on the TACACS+ server, the system downloads it and applies it. If the user is found to be coming from the 10.0.0.0
subnet, the system also immediately closes the Telnet connection. Note, that no matter where the user is coming from, they see the
login prompt.
When conguring a TACACS+ server host, you can set dierent communication parameters, such as the key password.
Example of Specifying a TACACS+ Server Host
Dell(conf)#
Dell(conf)#aaa authentication login tacacsmethod tacacs+
Dell(conf)#aaa authentication exec tacacsauthorization tacacs+
Dell(conf)#tacacs-server host 25.1.1.2 key Force
Dell(conf)#
Dell(conf)#line vty 0 9
Dell(config-line-vty)#login authentication tacacsmethod
Dell(config-line-vty)#end
Specifying a TACACS+ Server Host
To specify a TACACS+ server host and congure its communication parameters, use the following command.
• Enter the host name or IP address of the TACACS+ server host.
CONFIGURATION mode
tacacs-server host {hostname | ip-address} [port port-number] [timeout seconds] [key key]
Congure the optional communication parameters for the specic host:
– port port-number: the range is from 0 to 65535. Enter a TCP port number. The default is 49.
– timeout seconds: the range is from 0 to 1000. Default is 10 seconds.
– key key: enter a string for the key. The key can be up to 42 characters long. This key must match a key congured on the
TACACS+ server host. This parameter must be the last parameter you congure.
If you do not congure these optional parameters, the default global values are applied.
Example of Connecting with a TACACS+ Server Host
To specify multiple TACACS+ server hosts, congure the tacacs-server host command multiple times. If you congure
multiple TACACS+ server hosts, Dell Networking OS attempts to connect with them in the order in which they were congured.
To view the TACACS+ conguration, use the show running-config tacacs+ command in EXEC Privilege mode.
To delete a TACACS+ server host, use the no tacacs-server host {hostname | ip-address} command.
freebsd2# telnet 2200:2200:2200:2200:2200::2202
Trying 2200:2200:2200:2200:2200::2202...
Connected to 2200:2200:2200:2200:2200::2202.
Escape character is '^]'.
Login: admin
Password:
Dell#
Dell#
Security
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