# Master NGFW Engine interface configuration overview

The interface configuration for Master NGFW Engines consists of several main steps.

1. Define Physical Interfaces for both the Master NGFW Engine system communications, and for hosted Virtual NGFW Engines.
2. (Optional) Add VLAN Interfaces.
3. Add IP addresses to the physical interfaces used for system communications.
   - IP addresses are required for interfaces that are used for system communications.
   - You cannot add both an IP address and a Virtual Resource to the same Physical Interface or VLAN Interface.
4. Select which interfaces are used for different types of system communications.