Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network monitoring
Reexamination Certificate
1998-07-01
2001-01-23
Vu, Viet D. (Department: 2758)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network monitoring
C709S232000, C709S235000, C709S241000
Reexamination Certificate
active
06178450
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method and an apparatus for link-monitoring adaptive to the Internet. More specifically, this invention relates to a method and an apparatus for analyzing details of a telecommunication, from data flowing on a communication line, by emulating an inner procedure for a flow control in the TCP and by emulating a protocol behavior of the TCP based on a state transition of the protocol.
BACKGROUND DESCRIPTION
Recently, the TCP/IP is widely used in various computer communications as a result of a world-wide spread of the Internet. However, a great many users, who use a communication facility of the TCP/IP, do not have sufficient knowledge of details of a communication processing in the TCP/IP.
Herein, the TCP (Transmission Control Protocol) is a connection-oriented transmission control protocol for a transport layer and the IP (Internet Protocol) is a connectionless packet transfer protocol for a network layer. TCP and IP are major protocols used in the Internet.
In communication based on the TCP/IP, data throughput decreases when a loss of a packet occurs because of a congestion or a transmission error in a network, or when a parameter value such as a socket buffer size is different in two communication systems. In such cases, it is necessary to determine the cause of decreased throughput by analyzing details of the communication.
For inspecting a cause of decreasing throughput or, a protocol monitor is used to analyze a PDU (Protocol Data Unit) format and to display a result of the anaylsis. Further, an expert, who has a thorough knowledge of the details of the communication processing in the TCP/IP, analyzes a communication sequence by reading the result of the PDU format analysis.
The expert is necessary because the protocol monitor on the market does not have a function for analyzing a communication sequence and a function for inspecting a cause of throughput decreasing, while the protocol monitor has only a function for analyzing a PDU format and a function for displaying its result.
Therefor, it is difficult for the user who uses a communication facility of the TCP/IP to investigate a cause of decreasing throughput.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method adaptive to Internet link monitoring which is useful for investigating a cause of decreased throughput in communication based on the TCP/IP.
another object of the present invention is to provide an apparatus adaptive to Internet link monitor which is useful for investigating a cause of decreased throughput in communication based on the TCP/IP.
The present invention is a method adaptive to link monitoring that includes using an event sequence of a communication system which performs a communication based on TCP/IP protocol, a specification of TCP/IP state transition produced for TCP protocol specification, states and internal variables of TCP protocol, a status indicating what kind of internal procedure on a congestion control in TCP protocol is performed, and internal variables corresponding to internal procedures which include said internal procedure on a congestion control in TCP protocol;
emulating a behavior of TCP protocol based on a state transition and an internal procedure of TCP protocol; and
analyzing details of the communication by using a result of said emulation.
The present invention is an apparatus adaptive to link monitoring comprising:
means for recording an event sequence of a communication system which performs a communication based on TCP/IP protocol;
means for recording a specification of TCP/IP state transition produced from TCP protocol specification;
means for recording status and internal variable s of TCP protocol, wherein the status indicates what kind of internal procedure in TCP protocol is performed; and
means for analyzing details of the communication by emulating emulating a behavior of TCP protocol based on a state transition and an internal procedure of TCP protocol buy using said recorded information.
These and other objects of the present application will become more readily apparent from the detailed description given hereafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 5247517 (1993-09-01), Ross et al.
patent: 5347524 (1994-09-01), I'Anson et al.
patent: 5434845 (1995-07-01), Miller
patent: 5519689 (1996-05-01), Kim
patent: 5710885 (1998-01-01), Bondi
patent: 5828842 (1998-10-01), Sugauchi et al.
Idoue Akira
Kato Toshihiko
Ogishi Tomohiko
Suzuki Kenji
Kokusai Denshin Denwa Co. Ltd.
Vu Viet D.
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