Patent ID: 6178450
Filing Date: 2001-01-23
Classification: H04L

Abstract:
A method for monitoring a communication link comprising:using an emulation log of a communication system which performs communication based on TCP/IP protocol, an event sequence estimated based on the emulation log, a specification of TCP/IP state transition produced from TCP protocol specification, states of TCP protocol and internal variables of TCP protocol;emulating a behavior of TCP protocol based on a state transition and an internal procedure of TCP protocol; andanalyzing details of the communication by using a result of said emulating;wherein, said specification of TCP/IP state transition includes:a sending event procedure definition which defines at least one of states and internal variables after sending event processing, by prescribing a protocol data unit possible to be sent at every state and parameter conditions of the possible sending PDU;a receiving event procedure definition which defines at least one of states and internal variables after receiving event processing on at least one of a parameter of a receiving event, a present state and a present internal variable; andan expected sending event definition which defines at least one of states and internal variables after sending event processing by prescribing parameter conditions of a sending PDU corresponding to the expected sending event.