Access Authentication Control - D-Link DES-3526 Manual

System Utilities
Factory Reset
User Account Management
Add/Update/Delete User Accounts
View User Accounts
After establishing a User Account with Admin-level privileges, be sure to save the changes by opening
the Maintenance folder, opening the Save Changes window and clicking the Save Configuration
button.

Access Authentication Control

The TACACS/XTACACS/TACACS+/RADIUS commands let you secure access to the Switch using
the TACACS/XTACACS/TACACS+/RADIUS protocols. When a user logs in to the Switch or tries to
access the administrator level privilege, he or she is prompted for a password. If
TACACS/XTACACS/TACACS+/RADIUS authentication is enabled on the Switch, it will contact a
TACACS/XTACACS/TACACS+/RADIUS server to verify the user. If the user is verified, he or she
is granted access to the Switch.
There are currently three versions of the TACACS security protocol, each a separate entity. The
Switch's software supports the following versions of TACACS:
TACACS (Terminal Access Controller Access Control System) - Provides password checking and
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authentication, and notification of user actions for security purposes utilizing via one or more centralized
TACACS servers, utilizing the UDP protocol for packet transmission.
Extended TACACS (XTACACS) - An extension of the TACACS protocol with the ability to provide more
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types of authentication requests and more types of response codes than TACACS. This protocol also uses UDP
to transmit packets.
TACACS+ (Terminal Access Controller Access Control System plus) - Provides detailed access control for
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authentication for network devices. TACACS+ is facilitated through Authentication commands via one or more
centralized servers. The TACACS+ protocol encrypts all traffic between the Switch and the TACACS+ daemon,
using the TCP protocol to ensure reliable delivery
In order for the TACACS/XTACACS/TACACS+/RADIUS security function to work properly, a
TACACS/XTACACS/TACACS+/RADIUS server must be configured on a device other than the
Switch, called an Authentication Server Host and it must include usernames and passwords for
authentication. When the user is prompted by the Switch to enter usernames and passwords for
authentication, the Switch contacts the TACACS/XTACACS/TACACS+/RADIUS server to verify,
and the server will respond with one of three messages:
The server verifies the username and password, and the user is granted normal user privileges on the Switch.
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The server will not accept the username and password and the user is denied access to the Switch.
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The server doesn't respond to the verification query. At this point, the Switch receives the timeout from the
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server and then moves to the next method of verification configured in the method list.
The Switch has four built-in Authentication Server Groups, one for each of the TACACS, XTA-
CACS, TACACS+ and RADIUS protocols. These built-in Authentication Server Groups are used to
authenticate users trying to access the Switch. The users will set Authentication Server Hosts in a
preferable order in the built-in Authentication Server Groups and when a user tries to gain access to
DES-3526 / DES-3526DC Fast Ethernet Layer 2 Switch
Yes
Yes
Yes
Yes
Table 7- 1. Admin and User Privileges
123
No
No
No
No