You can see a list of connected devices at the bottom of the Device Status page:
1. Load the NVG599 Home page by entering http://192.168.1.254 in your Web browser’s location box.
2. Enter the Device Access Code then click Continue.
3. You should be able to find the MAC address of the pcWRT router in the Home Network Devices section.
P.S. You probably need the pcWRT IP address in order to identify it. Log on the pcWRT page at http://192.168.10.1, click Status. The IP address is the Address field in the Internet section.