EMG™ Edge Management Gateway User Guide 286
14: User Authentication
Users who attempt to log in by means of Telnet, SSH, the console port, or one of the device ports
are granted access by one or more authentication methods.
The User Authentication page provides a submenu of methods (Local Users, NIS, LDAP,
RADIUS, Kerberos, and TACACS+) for authenticating users attempting to log in. Use this page to
assign the order in which the EMG unit will use the methods. By default, local user authentication
is enabled and is the first method the EMG uses to authenticate users. If desired, you can disable
local user authentication or assign it a lower precedence.
Note: Regardless of whether local user authentication is enabled, the local user
sysadmin account is always available for login. For security purposes, full administrative
access to the EMG via the default sysadmin local user account can be limited to only the
front console port of the EMG device. See Limiting Sysadmin User Access on page 71.
Authentication can occur using all methods, in the order of precedence, until a successful
authentication is obtained, or using only the first authentication method that responds (in the event
that a server is down).
If you have the same user name defined in multiple authentication methods, the result is unknown.
Example:
There is an LDAP user "joe" and an NIS user "joe" and the order of authentication methods is:
1. Local Users
2. LDAP
3. NIS
User "joe" tries to log in. Because there is an LDAP user "joe," the EMG unit tries to authenticate
him against his LDAP password first. If he fails to log in, then the EMG may (or may not) try to
authenticate him against his NIS "joe" user password.
To enable, disable, and set the precedence of authentication methods:
1. From the main menu, select User Authentication. The following page displays:
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