Dell S4048-ON, Configuration Manual

Page: 739 / 1039

CONFIGURATION mode
aaa authentication enable default radius tacacs
2. Establish a host address and password.
CONFIGURATION mode
radius-server host x.x.x.x key some-password
3. Establish a host address and password.
CONFIGURATION mode
tacacs-server host x.x.x.x key some-password
Examples of the
enable
commands for RADIUS
To get
enable authentication
from the RADIUS server and use TACACS as a backup, issue the following commands.
The following example shows enabling authentication from the RADIUS server.
Dell(config)# aaa authentication enable default radius tacacs
Radius and TACACS server has to be properly setup for this.
Dell(config)# radius-server host x.x.x.x key <some-password>
Dell(config)# tacacs-server host x.x.x.x key <some-password>
To use local authentication for
enable secret
on the console, while using remote authentication on VTY lines, issue the following
commands.
The following example shows enabling local authentication for console and remote authentication for the VTY lines.
Dell(config)# aaa authentication enable mymethodlist radius tacacs
Dell(config)# line vty 0 9
Dell(config-line-vty)# enable authentication mymethodlist
Server-Side Configuration
Using AAA authentication, the switch acts as a RADIUS or client to send authentication requests to a or
RADIUS server.
• — When using , Dell Networking sends an initial packet with service type SVC_ENABLE, and then sends a
second packet with just the password. The TACACS server must have an entry for username $enable$.
• RADIUS — When using RADIUS authentication, FTOS sends an authentication packet with the following:
Username: $enab15$
Password: <password-entered-by-user>
Therefore, the RADIUS server must have an entry for this username.
Obscuring Passwords and Keys
By default, the
service password-encryption
command stores encrypted passwords. For greater security, you can also use
the
service obscure-passwords
command to prevent a user from reading the passwords and keys, including RADIUS,
keys, router authentication strings, VRRP authentication by obscuring this information. Passwords and keys are stored
encrypted in the configuration file and by default are displayed in the encrypted form when the configuration is displayed. Enabling
the
service obscure-passwords
command displays asterisks instead of the encrypted passwords and keys. This command
prevents a user from reading these passwords and keys by obscuring this information with asterisks.
Password obscuring masks the password and keys for display only but does not change the contents of the file. The string of
asterisks is the same length as the encrypted string for that line of configuration. To verify that you have successfully obscured
passwords and keys, use the
show running-config
command or
show startup-config
command.
If you are using role-based access control (RBAC), only the system administrator and security administrator roles can enable
the
service obscure-password
command.
Security
739