This keyword defines the PPP interface (either ipdptpn or ipdn). In Example 9-1, the following information appears in the path section:
interface ipdptp0 peer_system_name nubian-ppp
The interface keyword identifies ipdptp0 as the point-to-point interface that local endpoint nomada uses to communicate with the remote endpoint in the manner described in this path section. It associates the peer_system_name with the interface.