Abstract: A system and method for dedicating an externally configurable modem under system software control at a local peer for communication with one, single, predetermined remote peer, thereby providing the equivalent of a dedicate line by operating a single modem at the local node. The modem to be dedicated to the predetermined, single remote node is initialized to answer mode and reconfigured to originate mode when needed. The process of configuring the modem of the local node establishes a point-to-point protocol (PPP) route for establishing a physical connection path to the remote node.

Abstract: Communications between peer nodes interconnected over a single line in a point-to-point dial up network. During an a job initialization phase, a dial-on-demand (DOD) job which includes a data queue is registered, a DOD interface created, a modem initialized to answer calls, and the DOD job is waited on the data queue. During an originate session phase responsive to a start session request, a data packet for communication to a dedicated remote peer is received and loaded into the data queue; the modem dials the remote node and a connection is activated over which the data packet is transferred to the remote node. During a session end phase, the connection is deactivated; the modem is initialized to answer calls; and the DOD job waited on the data queue for an incoming call or a start session request.

Abstract: IP network address translation (NAT) and IP filtering with dynamic address resolution in an Internet gateway system. Symbolic interface names are recognized in selected rule statements. An symbolic s-rule file is generated from these rule statements which includes symbolic interface names. During processing of a packet message, the s-rule file corresponding to the interface name in the packet message is processed, with symbolic addresses in the s-rule file resolved to the IP addresses obtained from the packet message.