Abstract: A first elapsed time from transmission of a data segment until receipt of an acknowledgement is measured. A probability distribution of the first elapsed time is generated for a client device 50 on the basis of the measured first elapsed time. A second elapsed time from retransmission of a data segment until receipt of an acknowledgement is measured. A probability distribution of the second elapsed time is generated for a client device 50 on the basis of the measured first elapsed time. An estimation is made as to whether an acknowledgment pertains to which data segment on the basis of the generated probability distribution.

Abstract: It is an object of the present invention to execute testing to accurately reproduce problems of a TCP/IP protocol without mistakes without knowledge or skilled techniques of the TCP/IP protocol and reduce effort required for carrying out testing. The traffic generation apparatus 32 sends the test traffic data 55 to the testing server apparatus 41. The response traffic data 57 which is the response data of this test traffic data 55 is processed in a pseudo-communication environment constructed in the communication network emulator apparatus 37 to reproduce problems of the TCP/IP protocol. Settings and control for realizing this reproduction are automatically carried out by the testing control apparatus 44 using predetermined setting information 45a, 45b, 45c and control information 47a, 47b and 47c.

Abstract: A first elapsed time from transmission of a data segment until receipt of an acknowledgement is measured. A probability distribution of the first elapsed time is generated for a client device 50 on the basis of the measured first elapsed time. A second elapsed time from retransmission of a data segment until receipt of an acknowledgement is measured. A probability distribution of the second elapsed time is generated for a client device 50 on the basis of the measured first elapsed time. An estimation is made as to whether an acknowledgment pertains to which data segment on the basis of the generated probability distribution.

Abstract: An object of the present invention is to provide an automatic detecting apparatus for protocol nonconformity in which protocol nonconformity can be detected without necessity of technical knowledge and complex operation.