D-Link DFL-1660 User Manual page 400

8.2.4. External LDAP Servers
• The server does not respond within the Timeout period specified for the server. If only one
server is specified then authentication will be considered to have failed. If there are alternate
servers defined for the user authentication rule then these are queried next.
Usernames may need the Domain
With certain LDAP servers, the domain name may need to be combined with the username when the
user is prompted for a username/password combination.
If the domain is mydomain.com then the username for myuser might need to be specified as
myuser@mydomain.com. With some LDAP servers this might be myuser@domain
mydomain.com\myuser or even mydomain\myuser. The format depends entirely on the LDAP
server and what it expects.
Real-time Monitoring Statistics
The following statistics are available for real-time monitoring of LDAP server access for user
authentication:
• Number of authentications per second.
• Total number of authentication requests.
• Total number of successful authentication requests.
• Total number of failed authentication requests.
• Total number of invalid usernames.
• Total number of invalid password.
LDAP Authentication CLI Commands
The CLI objects that correspond to LDAP servers used for authentication are called LDAPDatabase
objects (LDAP servers used for certificate lookup are known as LDAPServer objects in the CLI).
A specific LDAP server that is defined in NetDefendOS for authentication can be shown with the
command:
gw-world:/> show LDAPDatabase <object_name>
The entire contents of the database can be displayed with the command:
gw-world:/> show LDAPDatabase
LDAP Authentication and PPP
When using a PPP based client for PPTP or L2TP access, special consideration has to be taken if
LDAP authentication is to succeed with CHAP, MS-CHAPv1 or MS-CHAPv2 encryption. The two
cases of (A) normal PPP authentication and (B) PPP with encryption are examined next.
A. Normal LDAP Authentication
Normal LDAP authentication for Webauth, XAuth, or PPP with PAP security is illustrated in the
diagram below. An authentication bind request with the username and password is sent to the LDAP
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Chapter 8. User Authentication