This object represents the network input interface on the sender router where the synthetic packets are received from the emulated endpoint source. This is used for path congruence with correct feature processing at the sender router.

The user can get the InterfaceIndex number from ifIndex object by looking up in ifTable. In fact, it should be useful to first get the entry by the augmented table ifXTable which has ifName object which matches the interface name used on the router or switch equipment console.