You can limit access to the Administration Server files, and directories on your web site by making them available only to clients using specific computers. You specify hostnames or IP addresses for the computers that you want to allow or deny. You can use wildcard patterns to specify multiple computers or entire networks. Access to a file or directory using Host-IP authentication appears easier to the user. Users can access the files and directories immediately without entering a username or password.
Since more than one person might use a specific computer, Host-IP authentication is more effective when combined with User-Group authentication. If both methods of authentication are used, a username and password are required for access.
Host-IP authentication does not require DNS to be configured on your server. If you choose to use Host-IP authentication, you must have DNS running on your network and your server must be configured to use it. You can enable DNS on your server through the Performance Tuning page in the Preferences tab on your Server Manager.
Enabling DNS degrades the performance of Sun Java System Web Server since the server is forced to perform DNS look-ups. To reduce the effect of DNS look-ups on your server’s performance, resolve IP addresses only for access control and CGI instead of resolving the IP address for every request. To do this, iponly=1 to AddLog fn="flex-log" name="access" in the obj.conf file:
AddLog fn="flex-log" name="access" iponly=1