44 results about "Packet sampling" patented technology

A traffic classifier has a plurality of binary classifiers, each associated with one of a plurality of calibrators. Each calibrator trained to translate an output score of the associated binary classifier into an estimated class probability value using a fitted logistic curve, each estimated class probability value indicating a probability that the packet flow on which the output score is based belongs to the traffic class associated with the binary classifier associated with the calibrator. The classifier training system configured to generate a training data based on network information gained using flow and packet sampling methods. In some embodiments, the classifier training system configured to generate reduced training data sets, one for each traffic class, reducing the training data related to traffic not associated with the traffic class.

To analyze traffic at an application level, a stream according to TCP or SCTP is required to be reconstructed and to be analyzed. When a packet is transferred to analyzing equipment using a port mirroring function with which a router and a switch are provided, transferred traffic volume increases and exceeds the throughput of the analyzing equipment. As only a part of packets configuring a stream is transferred to the analyzing equipment in transfer to the analyzing equipment using a packet sampling function, analysis at the application level is impossible. To solve the problem, when a packet communication unit recognizes a stream start packet, samples a stream initiated by the packet on a condition and at a rate respectively determined beforehand and generates a condition for copying the packet based upon information of both ends of the stream included in the packet, packets sampled in units of stream can be transferred to the analyzing equipment.

A packet loss estimation technique is disclosed that utilizes the sampled flow level statistics that are routinely collected in operational networks, thereby obviating the need for any new router features or measurement infrastructure. The technique is specifically designed to handle the challenges of sampled flow-level aggregation such as information loss resulting from packet sampling, and generally comprises: receiving a first record of sampled packets for a flow from a first network element; receiving a second record of sampled packets for the flow from a second network element communicating with the first network element; correlating sampled packets from the flow at the first network element and the second network element to a measurement interval; and estimating the packet loss using a count of the sampled packets correlated to the measurement interval.

The present invention discloses a data package sampling statistics method, wherein, the method comprises the following steps: distill the key words of the received data package to obtain the type of the data package; plus the aforesaid type data package counter value with one and delivery the latest counter value according to the preplaced sample alternation; sampling stat the data package if the counter value delivered result is the system preplaced sample value. The present invention samples the data package by classification, samples each type by bags or by time to make sure that each type of the data package can be chosen, which deoxidizes the true flux distributing circus as far as possible and decreases the sampling distortion degree. The present invention, corresponding to the aforesaid method, also provides a data package sampling statistics device.

Systems and methods are disclosed to provide egress port overload protection for network packet forwarding systems. Input packets are received at one or more ingress ports and load balanced among a plurality of egress ports for the packet forwarding system. Load balanced packets associated with each egress port are then sampled to generate sampled load balanced packets that are output from the egress port. For certain embodiments, a sampling percentage is used for the packet sampling, and the sampling percentage for each egress port is set based upon a comparison of a current traffic rate for the egress port to a threshold rate for the egress port. The threshold rates for the egress ports are allowed to be configured through a user interface. Further, session and non-session traffic can be identified, and session aware load balancing and/or per-port packet sampling can be applied.

The invention discloses a cigarette packet sampling-inspection method capable of avoiding unloading of trays from a conveying line. The cigarette packet sampling-inspection method comprises the steps of cigarette packet ex-warehouse, cigarette packet conveying, cigarette packet sampling-inspection, empty tray stacking, empty tray detection, empty tray return and the like. The cigarette packet sampling-inspection method disclosed by the invention has no need of forking trays off from the conveying line, and is capable of guaranteeing automatic conveying for the trays, reducing the investment of auxiliary equipment, reducing the damage of the trays during a manual operation process, and lowering the production running cost of an enterprise.

The invention discloses a space-time classification-based dynamic background differential detection method, a system and a device. The method comprises the steps of establishing a background model corresponding to each pixel in an image through packet sampling in a time sequence, classifying pixels in the background model according to to-be-detected pixels and obtaining a rough foreground mask image; with a foreground pixel point in the rough foreground mask image as a center, classifying pixel points in a preset neighboring domain range of the central pixel point, and correcting the central pixel point to be a background pixel point or still maintaining the central pixel point as a foreground pixel point according to the number of pixel points the same type with the central pixel point within the preset neighboring domain range of the central pixel point and belonging to background pixel points. According to the invention, the packet sampling method is adopted, so that the ability ofthe dynamic background description is enhanced. Only pixel points the same type of the central pixel point are adopted to judge whether a foreground pixel point is a real foreground pixel point or not. Therefore, the accuracy of detection is improved. The method can be widely applied to the field of moving target detection.

A method and a system for sampling a packet as well as a device are disclosed herein. The method includes the following steps: a notification node of an LSP sends obtained information about the protocol type of a packet to a specific netflow sampling entity; the netflow sampling entity determines the protocol type of the packet according to the information about the protocol type after receiving the packet, and samples the packet according to the determined protocol type. Through the embodiments of the present invention, the accuracy of netflow sampling is improved significantly.

The invention is applied to the field of luminous power control, and provides an automatic control method for burst luminous power. The automatic control method comprises the following steps: when a laser is in a working state, outputting backlight current which is respectively obtained by a short packet sampling circuit and a medium-long packet sampling circuit, wherein the short packet sampling circuit can sample and maintain the backlight current at the current moment; when a trigger signal is turned into being valid from being invalid, triggering interruption for one time; in the interruption process, judging whether the trigger signal is valid or not; if the trigger signal is determined to be invalid, judging that the data packet transmitted by the laser is a short packet, then jumping out of interruption, triggering computing of the sampled luminous power according to the backlight current stored by the short packet sampling circuit, and adjusting the light transmitting power of the laser according to the comparative analysis result with the targeted luminous power. According to the automatic control method disclosed by the invention, the short time storage characteristic of the short packet sampling circuit is utilized, and the short packet current is stored, so that the problem that in the prior art the short packet luminous power adjustment cannot be processed can be solved.

The invention discloses a cigarette packet sampler, relates to an automatic sampler for detecting the density, humidity and other indexes of the cigarette packet, which belongs to field of tobacco machinery. The invention provides a cigarette packet sampler which exerts a short-term pressure onto the top of the cigarette packet to avoid the lifting of the cigarette and the damage at the top layer when a sampling rod withdraws. The cigarette packet sampler comprises a machine frame, a cigarette packet transmission device, and a sampling device, wherein, the cigarette packet transmission device is provided with a cigarette packet sampling stay position, the sampling device comprises a driving oil cylinder, a main pressing head, the sampling rod, and a damping pressing packet device, the damping pressing packet device comprises a damping mechanism, and a follow-up pressing plate supported by the damping mechanism; the follow-up pressing plate is arranged above the cigarette packet stay position on the cigarette packet transmission device, and the position on follow-up pressing plate which corresponds to the position of the sampling rod in the sampling device is provided with a through hole which leads the sampling rod to pass through freely. The invention has advantages that: the structure is simple, and the sampling efficiency can be greatly increased.

The invention provides an adaptive protocol sampling method and an adaptive protocol sampling device. The method comprises the following steps of presetting a transmission protocol priority according to a transmission protocol type distribution used by virus transmission, wherein each priority corresponds to one priority list; detecting performance parameters of a sampling device and determining a sampling width; receiving and parsing a data packet and obtaining the transmission protocol type of the data packet; determining the priority of the data packet, and determining a sampling rate of the data packet according to the corresponding priority list and sampling width; collecting data in the data packet according to the sampling rate; and sending the collected data to the data processing part. The device comprises a configuration unit, a detecting unit, a data receiving unit, an analysis unit, a data collecting unit and a sending unit. According to the method and the device provided by the invention, when massive data are processed, the priority is determined through the protocol type, and the data with a low degree of importance are abandoned, so that both the equipment performance and result of handling can be ensured.

The embodiment of the invention provides a method and a device for processing data packets. The method and the device can be applied to an LVS (Linux Virtual Server). The method comprises the following steps: acquiring all to-be-sent data packets by the LVS; determining sampling data packets, in which IP (Internet Protocol) addresses of corresponding client sides require to be written, of all thedata packets according to a preset data packet sampling rate; writing the IP addresses of the corresponding client sides in the sampling data packets, thus obtaining all target data packets; sending all the target data packets to a preset back-end server, and carrying out service analysis on the client sides corresponding to all the data packets according to the IP addresses of the client sides inall the target data packets by the back-end server based on the processing.

The invention discloses an SDN based user-defined data packet sampling method. The SDN based user-defined data packet sampling method comprises the step of 1) setting a sampling module in a controller, and configuring an appointed switch by the controller based on sampling configuration information sent by an upper-layer application; 2) when the controller receives a sampling start instruction sent by the upper-layer application, sending the sampling start instruction to the appointed switch; 3) when the switch receives the sampling start instruction, starting a set timer, sieving each data packet based on configuration to obtain data packets meeting a matching rule, then extracting needed content from the sieved data packets according to a configured sampling mode and outputting the needed content to an appointed port; and 4) when the controller receives a sampling stop instruction sent by the upper-layer application, sending the sampling stop instruction to the appointed switch based on the sampling start instruction, and when the switch receives the sampling stop instruction, stopping sampling and cancelling the timer. The SDN based user-defined data packet sampling method not only guarantees more accurate sampling content, but also can reduce the size of the data packets to the maximum extent.