DC Agent and user machines
In order for DC Agent to identify users, the users must log on to a Windows domains. Client machines do not necessarily need to be running a Windows operating system.
The IP address of each computer is a key element in applying policies. If DC Agent cannot identify a machine by IP address, the Default policy is applied to Internet requests made from that machine.
For each logon session detected by a domain controller, DC Agent performs a DNS lookup to convert the user’s machine name to an IP address, and then stores the IP address in its user map.