After you uncheck this checkbox and then Save the Data Template, any existing Data Sources based on this Data Template will loose their Custom Data.This can result in broken Data Collection and Graphs
If Cacti can not determine the interface speed due to either ifSpeed or ifHighSpeed not being set or being zero, what maximum value do you wish on the resulting RRDfiles.
<blockquote><i>Built-in Authentication</i> - Cacti handles user authentication, which allows you to create users and give them rights to different areas within Cacti.<br><br><i>Web Basic Authentication</i> - Authentication is handled by the web server. Users can be added or created automatically on first login if the Template User is defined, otherwise the defined guest permissions will be used.<br><br><i>LDAP Authentication</i> - Allows for authentication against a LDAP server. Users will be created automatically on first login if the Template User is defined, otherwise the defined guest permissions will be used.If PHPs LDAP module is not enabled, LDAP Authentication will not appear as a selectable option.<br><br><i>Multiple LDAP/AD Domain Authentication</i> - Allows administrators to support multiple disparate groups from different LDAP/AD directories to access Cacti resources.Just as LDAP Authentication, the PHP LDAP module is required to utilize this method.</blockquote>