Nortel Networks Corporation

Solana Networks Inc.

Belair Networks Inc.

Tropic Networks Inc.

Alcatel-lucent Canada Inc.

Cavesson Software LLC

Ericsson Wifi Inc.

Biswajit Nandy

Nabil Seddigh

Rupinder Singh Makkar

Peter Steven Pieda

Carl F Cao

Yajun Liu

Don W Bennett

Dabin Wang

Kevin Wong

Stephen G Rayment

Jamal Hadi Salim

Tricci Yuk-Ying So

Donald William Arthur Bennett

Nisan Rowhani

Joseph Fook-Kong Thoo

Alan S Chapman

Udo Mircea Neustadter

Hassan Halabian

Nausheen Naz

Paul David Obeda

Douglas Heath Patriarche

Ioannis Lambadaris

Donald William Bennett

Eddie Ka Lun Law

Alan Sj Chapman

Satheesa Nadaragh

Richard A Houle

Fozia A Zaidi

Jeremy G Ethridge

Abderrahmane Lakas

Sabeel Ansari

Craig Dillabaugh

Alan Stanley Chapman

Sudhakar Ganti

Systems and methods for discovery and mapping of industrial control and SCADA networks are described herein. The disclosed systems and methods help operators ensure the cyber security of their SCADA network through accurate discovery, fingerprinting and mapping the industrial control network map, including PLCs (Programmable Logic Controller) and RTUs (Remote Terminal Unit), using passive techniques.

Method and system for discovery and mapping of a network topology

Disclosed is a methodto be used on collected network data flowassociated with a network; the methodincludes: an anomaly-detection operationincluding: (A) obtaining the collected network data flow; and (B) performing an iterative principal component analysis on the collected network data flowto detect an anomaly associated with the collected network data flow. The method may be used in a server and a network, and may also be implemented as a non-transitory computer-readable media. A corresponding system for detecting the anomaly in the network flow data is also provided.

Detection of anomaly in network flow data

Network traffic flow records received from a network probe are recorded in multiple sets of buckets of different granularity, optimized for the purpose of almost instant analysis and display as well as for longer term report generation. The flow data is pre-processed and stored redundantly in parallel in multiple bucketized data base tables of different time window sizes. Denormalized tables keyed on different combinations of traffic flow attributes are precomputed and stored in parallel tables redundantly to facilitate a near real time display of summarized network traffic data, and a capability to rapidly generate reports for different monitoring periods.

Method and system for processing network traffic flow data

Network traffic flow records received from a network probe are filtered and short traffic flows are selected so that the total number of short traffic flows is high but the number of bytes in the short traffic flows is negligible, followed by discarding of the short traffic flows. Traffic flow data is recorded in multiple sets of buckets of different granularity, optimized for the purpose of almost instant analysis and display as well as for longer term report generation. The traffic flow data is pre-processed and stored redundantly in parallel in multiple bucketized data base tables of different time window sizes. A corresponding method and system are provided.

Method and system for monitoring and analysis of network traffic flows

Devices, networks and methods relating to routing gateway traffic in a mesh network for wireless access. A mesh network has multiple nodes in at least one gateway node through which all incoming and outgoing data traffic pass through. The nodes provide wireless access to wireless and user devices, each of which is associated with anode in the mesh network. Each gateway node contains a record detailing which nodes are providing wireless access to which wireless end user device and which nodes are associated with which end user devices. This record of each end user device's location is periodically updated as the gateway node periodically receives data from the nodes which detail the device is being serviced by which node. Any incoming data traffic destined for an end user device is encapsulated and routed to the proper node servicing that end user device.

Mobile station traffic routing

A real-time network-analysis system comprises a network appliance and a plurality of management devices. The network appliance continuously monitors an object network and synthesizes a current network image comprising contemporaneous indicators of connectivity, occupancy, and performance of the object network. A management-client device may gain access to the network image for timely control and for use in producing long-term network-evolution plans. To enable the creation of a real-time network image, optimized topology synthesis algorithms are devised to minimize the computational effort. The real-time network-analysis system is adapted for use with an object network employing a variety of routing protocols, such as link-state protocols, and network-management protocols, such as the Simple-Network-Management protocol.

Real-time network analyzer

Devices, networks and methods relating to routing gateway traffic in a mesh network for wireless access. A mesh network has multiple nodes in at least one gateway node through which all incoming and outgoing data traffic pass through. The nodes provide wireless access to wireless and user devices, each of which is associated with a node in the mesh network. Each gateway node contains a record detailing which nodes are providing wireless access to which wireless end user device and which nodes are associated with which end user devices. This record of each end user device's location is periodically updated as the gateway node periodically receives data from the nodes which detail the device is being serviced by which node. Any incoming data traffic destined for an end user device is encapsulated and routed to the proper node servicing that end user device.

Methods and apparatus for topology discovery of a network having heterogeneous network devices are disclosed. A network appliance communicates with the network devices to acquire device descriptors and characterize the network devices accordingly. Topology discovery is based on device characteristics, media-access data, and encoded connectivity patterns, where each connectivity pattern is defined by devices of specific device types and respective media-access data. A topology deduction module of the network appliance synthesizes a network image starting with unconnected devices and progressively incorporating detected connectivity patterns.

Method and system for network topology discovery

An alert system for a communications network has a plurality of client devices and a plurality of alert servers each adapted to provide alerts to a respective subset of the client devices to provide scalability. Users at the client devices subscribe to receive alerts by selecting a scope of distribution of alerts. The selection involves selecting a type of alert to receive, a level of severity of alerts to receive, and a geographic scope. In response to receiving a request to issue an alert, an alert server notifies the other alert servers of the alert. Each alert server determines which client devices of the respective subset of client devices are to receive the alert. Each alert server then sends an alert message to its client devices that are to receive the alert.

Alerting method, apparatus, server, and system

A method for monitoring lightpaths in an optical network comprising nodes interconnected by wavelength-multiplexed links is disclosed. Each lightpath is identified by a respective optical signature. A node stores identifiers of optical signatures of lightpaths designated to traverse the node and identifiers of adjacent nodes. Each node also maintains a record of all optical signatures it detects. A command-line interface associated with a selected node tracks a selected lightpath, designated to traverse the selected node, by propagating messages in an upstream direction, a downstream direction, or both, requesting other nodes to provide information pertinent to the selected lightpath. The selected node may also send messages to all its neighboring nodes requesting each to indicated detection, or otherwise, of the selected lightpath. Thus, the method relies on localized information, maintained at each node, and cooperative exchange of data among nodes without interacting with a centralized network management facility.

Method and system for light path monitoring in an optical communication network

A system of hitless restart in a network, where at least one node in the network provides routing control distributed among ingress ports (ingress cards) and egress ports (egress cards), is disclosed. With distributed routing control, each ingress card has its own routing-control software and each egress card has its own routing-control software. When the routing-software at an ingress port or an egress port of a node is restarted, current connections traversing a restarting ingress card or a restarting egress card continue to function normally during a restart period without data loss. The disclosed system is tailored to a multi-protocol label switching (MPLS) network employing distributed-resource-reservation-protocol traffic engineering (RSVP-TE). The system relies on messaging between ingress card control planes, ingress card data planes, egress card control planes, and egress card data planes of a restarting node.

System and method for distributed resource reservation protocol-traffic engineering (RSVP-TE) hitless restart in multi-protocol label switching (MPLS) network

A system and method for transmitting data in a data communications network, using a transmission control protocol, to provide reduced acknowledgment control traffic, error recovery and congestion control. A communications link is established between a transmitter and a receiver. Setting the communications link includes setting a network congestion window to an initial length. A sequence, or stream, of data packets is sent from the transmitter to the receiver. The receiver detects any missing packets, by examining the sequence numbers of the incoming packets, and sends negative acknowledgments, generally no more than four, to the transmitter identifying the missing data packet. When the transmitter receives a negative acknowledgment, it decreases the length of the congestion window, and re-transmits the missing packet. Detection and use of round-trip time, re-transmission time-out are provided.

System and method for a negative acknowledgement-based transmission control protocol

A system and method for data flow classification based on a configurable rule-engine, is presented herein. In accordance with an embodiment of the invention, the system includes a data flow managing mechanism configured to identify, track, and manage the data flows and a rule set, which includes a plurality of rules for comparing information contained within data flow with pre-specified values. The system also includes a configurable classification rule engine for classifying the data flows into one of a plurality of traffic classes based on results of the comparisons. The configurable classification rule engine is configured via a configuration file that specifies and allows for the modification and reconfiguration of the pre-specified values and information regarding the data flows, the rule set, and the traffic classes.

Configurable rule-engine for layer-7 and traffic characteristic-based classification

Growing community of inventors

Kanata, Canada

Biswajit Nandy