# Physical Interface Configuration

Some devices allow you to define the physical connection mode on a specific interface. This page allows you to configure the following physical interface options:

Linkdown: Select Yes to bring the physical link down.

Auto Negotiate:

- Select Yes to configure the security device to automatically decide whether to operate at full or half duplex.

- Select No to manually configure the duplex and speed.

Duplex:

- Select Half to force the security device to operate at half duplex. Specify either 100Mbps or 10Mbps.

- Select Full to force the security device to operate at full duplex. Specify either 100Mbps or 10Mbps Speed.

Speed: Sets the duplex speed to either 100 Mbps or 10 Mbps.

Holddown: Sets the hold-down time for the link. Select a value in increments of 100 milliseconds. The default value is 0.