# Network interfaces for Security Engine

The network interface configuration stored on the Management Server contains most of the settings for network interfaces.

The interface configuration is done using the SMC Client. The interface configuration stored on the Management Server does not contain:

- The network card driver selection
- The mapping of the operating system port numbers to the numbers used in the SMC Client
- The network card speed/duplex settings

Note: If you use automatic configuration for appliances, the Interface IDs that you select in the SMC Client must match the port numbers on the physical appliances. Check the port numbers in the relevant hardware guide.
Note: The configuration transferred from the Management Server overwrites the settings that can be defined through the engine command line. The settings contain the details for initial contact with the Management Server to establish a trusted communications channel.