Kddi Corporation

Ddi Corp.

Tomohiko Ogishi

Toru Hasegawa

Akira Idoue

Yuichiro Hei

Shigehiro Ano

Toshihiko Kato

Masafumi Watari

A path management device of the present invention manages information about communication paths in a communication network, the communication network including a plurality of routers mutually connected by means of a communication line, link states between the plurality of routers being shared among each of the plurality of routers by means of link state advertisement messages that are announced from each of the plurality of routers, and routing tables being created in each of the plurality of routers based on shortest path trees, and the path management device includes: a receiving unit that receives the link state advertisement messages; a routing table creation unit that reproduces the shortest path trees and the routing tables of each of the plurality of routers based on the link state advertisement messages; and a routing table recording unit that records the reproduced routing tables of each of the plurality of routers.

Path management device and program storing medium

The present invention provides a BGP route evaluation device and method. A message receiving sectionreceives a BGP Update message. A status detecting sectiondetects the active/inactive status of each BGP route on the basis of a pair of prefix and next hop registered in 'Announce' and 'Withdraw' of the BGP Update message. In a management table, the active/inactive status of each BGP route is managed. An update sectionupdates the registration contents of the management tableon the basis of the detection result of the active/inactive status. An evaluation sectionevaluates each BGP route on the basis of the registration contents of the management table

BGP route evaluation method and device therefor

In order to provide the routing information of both the present time and the past, provide the latest routing information very quickly and improve searching speed of the routing information, a routing information management apparatus includes: a routing information receiving portion receiving routing information which broadly notifies a change/withdrawal of a communication route and which is received from an observation apparatus of communication routes; and a routing state table generation portion which generates a routing state table of each of the communication routes including both a route existing time based on a received time of the routing information and a range of an address space obtained by digitizing a prefix involved in the routing information, and which stores the routing state table in a routing information database.

Routing information management apparatus and computer program of the same

As shown in FIG., when the SYN segment is detected, the amount of transmitted segment from the side which sent the detected SYN segment is obtained by counting the continuously detected DATA segments for collecting the traffic in a certain direction where it is impossible to directly capture the traffic. Further, the amount [ini_sdt] of the transmitted bytes from the side which sent the detected SYN segment is obtained by calculating the equation [ini_sdt]=[SEQn+LENn]&#x2212;[SEQ. Wherein, [SEQis the sequence number of the first detected DATA segment, [SEQn] is the sequence number of the last detected DATA segment and [LENn] is the user data length of the last detected DATA segment.

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Fujimino, Japan

Tomohiko Ogishi