Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Reexamination Certificate
1998-10-29
2002-07-16
Vincent, David (Department: 2661)
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
C370S230100, C709S224000
Reexamination Certificate
active
06421319
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a network traffic monitoring system applied to a wide area network.
In a conventional traffic monitoring apparatus applied to a LAN (Local Area Network), source IP (Internet Protocol) addresses and destination IP addresses are read out, and a totalization table associated with the traffic transmitted with combinations of source and destination IP addresses is generated, thus performing data collection. For example, such a conventional technique is disclosed in Japanese Patent Laid-Open Nos. 5-075621, 6-318944, 8-181711, and 9-191327.
When the above conventional scheme is to be applied to a wide area network (WAN) without any modification, the following problems arise.
First, in a WAN, an enormous number of combinations of source and destination IP addresses will be collected. For example, in a WAN including n hosts, the number of combinations of source and destination IP addresses for communication between the IP hosts within a unit collection time may become n(n−1) in the worst case depending on the network arrangement. The traffic trend in a large-scale WAN cannot be properly analyzed by using IP host communication information alone.
Second, in a traffic monitoring apparatus, a large memory is required to store combinations of source and destination IP addresses, and a long CPU processing time is required to search the table. In addition, the performance of the monitor deteriorates as the amounts of data collected and analyzed/displayed increase.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a network traffic monitoring system which can collect statistic information in units of subnets and totalize/monitor the traffic suitable for a WAN.
In order to achieve the above object, according to the present invention, there is provided a network traffic monitoring system comprising a router to which a subscriber line is connected, a terminal adaptor for interfacing the router to a network side, a digital service unit connected to the terminal adaptor through an I interface, a frame relay/leased network made up of at least one of a higher-speed relay router and a switching unit and transmission lines, a traffic monitoring means for monitoring internet traffic on a physical line between the terminal adaptor and the digital service unit, and monitor means for controlling the traffic monitoring means to start and stop totalization processing, setting a subnet mask for determining a totalization unit, and acquiring traffic information as a totalization result from the traffic monitoring means.
REFERENCES:
patent: 5706436 (1998-01-01), Lewis
patent: 6061725 (2000-05-01), Schwaller
patent: 6209033 (2001-03-01), Datta
patent: 6292465 (2001-09-01), Vaid
patent: 5-75621 (1993-03-01), None
patent: 6-164583 (1994-06-01), None
patent: 6-318944 (1994-11-01), None
patent: 7-162512 (1995-06-01), None
patent: 8-181711 (1996-07-01), None
patent: 8-265317 (1996-10-01), None
patent: 8-288945 (1996-11-01), None
patent: 9-135261 (1997-05-01), None
patent: 9-191327 (1997-07-01), None
Japanese Office Action, dated Sep. 5, 2001, with English language translation of Japanese Examiner's comments.
O. Miura, Internetwork LAN, p. 47-49, 1994.
Japanese Office Action, dated Jul. 18, 2000, with English language translation of Japanese Examiner's comments.
Pizarro Ricardo M.
Vincent David
Whitham Curtis & Christofferson, PC
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