Administrator Guide

First bold line: Server key purposely changed to incorrect value.
Second bold line: User authenticated using the secondary method.
Dell(conf)#
Dell(conf)#do show run aaa
!
aaa authentication enable default tacacs+ enable
aaa authentication enable LOCAL enable tacacs+
aaa authentication login default tacacs+ local
aaa authentication login LOCAL local tacacs+
aaa authorization exec default tacacs+ none
aaa authorization commands 1 default tacacs+ none
aaa authorization commands 15 default tacacs+ none
aaa accounting exec default start-stop tacacs+
aaa accounting commands 1 default start-stop tacacs+
aaa accounting commands 15 default start-stop tacacs+
Dell(conf)#
Dell(conf)#do show run tacacs+
!
tacacs-server key 7 d05206c308f4d35b
tacacs-server host 10.10.10.10 timeout 1
Dell(conf)#
tacacs-server key angeline
Dell(conf)#%RPM0-P:CP %SEC-5-LOGIN_SUCCESS: Login successful for user admin on
vty0 (10.11.9.209)
%RPM0-P:CP %SEC-3-AUTHENTICATION_ENABLE_SUCCESS: Enable password
authentication success on vty0 ( 10.11.9.209 )
%RPM0-P:CP %SEC-5-LOGOUT: Exec session is terminated for user admin on line
vty0 (10.11.9.209)
Dell(conf)#username angeline password angeline
Dell(conf)#%RPM0-P:CP %SEC-5-LOGIN_SUCCESS: Login successful for user angeline
on vty0 (10.11.9.209)
%RPM0-P:CP %SEC-3-AUTHENTICATION_ENABLE_SUCCESS: Enable password
authentication success on vty0 ( 10.11.9.209 )
Monitoring TACACS+
To view information on TACACS+ transactions, use the following command.
• View TACACS+ transactions to troubleshoot problems.
EXEC Privilege mode
debug tacacs+
TACACS+ Remote Authentication
Dell Networking OS 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, then Dell Networking OS ignores the access class you have congured for the VTY line. Dell
Networking OS instead gets this access class information from the TACACS+ server. Dell Networking OS needs to 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, Dell Networking OS closes the Telnet session immediately.
The following example shows how to congure the access-class from a TACACS+ server. This causes the congured access-class on the
VTY line to be ignored. If you have congured a deny10 ACL on the TACACS+ server, Dell Networking OS downloads it and applies it. If
the user is found to be coming from the 10.0.0.0 subnet, Dell Networking OS also immediately closes the Telnet connection. Notice that no
matter where the user is coming from, they see the login prompt.
Example of Specifying a TACACS+ Server Host
Dell(conf)#ip access-list standard deny10
Dell(conf-std-nacl)#permit 10.0.0.0/8
Security
815