# Foreign Agent Interface Configs

## Navigation

1. Right-click the device, and select Configure. The Device Configuration dialog box appears.

2. Select Foreign Agent Interface Configs from the Category list.

The following information appears:

> Interfaces Index (ifIndex)

> Reverse Tunnel Capability (cmiFaReverseTunnelEnable)

> FA Challenge Capability (cmiFaChallengeEnable)

> CHAP_SPI Number (cmiFaAdvertChallengeChapSPI)

### Interfaces Index (ifIndex)

A unique value, greater than zero, for each interface. The value for each interface sublayer must remain constant at least from one reinitialization of the entity's network management system to the next reinitialization.

### Reverse Tunnel Capability (cmiFaReverseTunnelEnable)

Specifies whether reverse tunnel capability is enabled on the interface or not.

### FA Challenge Capability (cmiFaChallengeEnable)

Specifies whether foreign agent challenge capability is enabled on the interface or not.

### CHAP_SPI Number (cmiFaAdvertChallengeChapSPI)

Specifies the CHAP_SPI number for foreign agent challenge authentication.