Avocent Cyclades ACS5048 User's Guide download pdf (Page 121)

2. Click the Access tab. The Access form appears.

3. To restrict access to one or more users or to a group of users, enter previously defined user

or group names in the Authorized Users/Groups field, with names separated by commas.

4. To deny access to one or more users or groups, preface the user or group names with an

exclamationpoint (!).

5. Click Done.

6. Click apply changes.

Authentication methods and fallback mechanism

The following table provides a brief description of the authentication methods. When an

authentication method is configured to be performed by an authentication server such as

Kerberos, LDAP, RADIUS or TACACS+, the user can get access denial if either the

authentication server is down or it does not authenticate. An authentication fallback mechanism

can be defined in case the first authentication level fails. The following table describes the

authentication methods and fallbackmechanisms.

Authentication Type Definition

None No authentication.

Kerberos Authentication is performed using a Kerberos server.

Kerberos/Local Kerberos authentication is tried first, switching to Local if unsuccessful.

KerberosDownLocal Local authentication is performed only when the Kerberos server is down.

LDAP Authentication is performed against an LDAP database using an LDAPserver.

LDAP/Local LDAP authentication is tried first, switching to Local if unsuccessful.

LDAPDownLocal Local authentication is performed only when the LDAP server is down.

Local Authentication is performed locally. For example, using the /etc/passwd file.

Local/Radius Authentication is performed locally first, switching to Radius if unsuccessful.

Local/TACACS+ Authentication is performed locally first, switching to TACACS+ ifunsuccessful.

Local/NIS Authentication is performed locally first, switching to NIS if unsuccessful.

NIS NIS authentication is performed.

NIS/Local NIS authentication is tried first, switching to Local if unsuccessful.

Table 9.5: Expert - Authentication Methods and Fallback Mechanisms

Chapter 9: Ports Menu and Forms 113

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Avocent Cyclades ACS5048 User's Guide Page 121