7 results about "Neighbor Discovery Protocol" patented technology

Described herein are systems and methods for reducing collisions in a wireless network with overlapping basic service sets by synchronizing contention slots among stations (access points or non-access point clients), some of which are out of range, competing for the use of the wireless medium. In some embodiments, the contention slots of competing stations are synchronized by controlling the time of transmission and the time of the spacing between frames to be an integer multiple of the time of a contention slot. In some embodiments, slot boundaries are enforced by controlling guard intervals or by trigger-based uplink communications. In other embodiments, a central network controller, such as a network controller, synchronizes slots when an access point or station joins the wireless network or uses a neighbor discovery protocol among access points. The contention slots are synchronous in all cases throughout the overlapping basic service sets.

The embodiment of the invention provides a data transmission method, network equipment, a storage medium and a computer program product. In a network layer, a neighbor discovery protocol carrying an SRv6 Locator and / or an SRv6 Capability of a first network device is sent. Therefore, the second network equipment can obtain the SRv6 Locator and / or the SRv6 Capability of the first network equipment. Furthermore, in a link layer, a link layer discovery protocol carrying the SRv6Locator and / or the SRv6Capability of the first network equipment is sent, so that the second network equipment can obtain the SRv6Locator and / or the SRv6Capability of the first network equipment according to the link layer discovery protocol. Therefore, the dynamic release of the routing information of the first network equipment is realized by utilizing two protocols which do not conflict with each other.

The present invention relates to the field of IPv6 network security technology, and more particularly to an IPv6 neighbor discovery protocol security protection method and system based on SDN and P4 technologies. The method comprises building an SDN architecture in a target IPv6 network, separating the control plane and data plane of a switch in the target IPv6 network, wherein the control plane is composed of a switch local controller and performs MAC address self-learning based on data plane transmission information; the data plane is composed of a P4 packet processor, and the P4 packet processor is used to pre-collect target IPv6 network host address information; for request and notification messages sent by a host, the pre-collected target IPv6 network host address information is used to verify the request and notification message data packets to filter out abnormal data packets, and securely forward the request and notification message data packets that pass the verification. The method collects IPv6 addresses and corresponding switch port information of IPv6 hosts that join the network for duplicate address detection, filters abnormal data packets that do not belong to the corresponding switch port, and forwards data packets according to a self-learning forwarding table to resist NS / NA spoofing threats. The method can protect neighbor request and neighbor advertisement processes, has lower complexity, consumes less resources, is trustworthy in deployment and application, and can effectively protect against IPv6 network spoofing threats.

The invention provides a LoRa-based low-delay and high-reliability communication method and system for multi-robot cooperation. The LoRa-based low-delay and high-reliability communication method and system are provided. The method belongs to the technical field of industrial wireless communication, multi-agent system and edge cooperative control crossing. The method comprises the following steps: carrying out decentralized ad hoc network topology construction on a multi-robot system, and generating direct communication link data between robots; a dynamic neighbor discovery protocol is deployed according to direct communication link data between robots, so that a decentralized LoRa network topology structure is constructed; by constructing the decentralized LoRa network, the direct communication capability between the robots is improved, the limitation of dependence on a central gateway traditionally is broken, the communication hop count and time delay are reduced, and the collaborative operation is more efficient. The microsecond-level time synchronization mechanism enhances the accuracy of multi-robot action coordination, avoids the problems of formation advancing deviation and the like caused by clock drift, and ensures smooth development of a coordination task.

The application discloses a fault alarm method and device and a storage medium, relates to the technical field of facility operation and maintenance, and comprises the following steps: based on a preset neighbor discovery protocol, completing equipment identity detection of a baseboard management controller (BMC) and a smart power distribution unit (PDU) by an exchange machine, constructing and dynamically updating a global mapping table corresponding to each device in a fault monitoring system; periodically monitoring network connectivity with the BMC through the exchange machine, detecting a network cable physical connection state when the connectivity fails, and based on the global mapping table, querying power supply and power-on states of the PDU and the jack associated with the BMC; performing fault root cause analysis on the network cable physical connection state and the power supply and power-on states, generating fault alarm information, and sending the fault alarm information to a preset management system. The application can realize automatic construction and dynamic maintenance of a server power supply link topology, break the information island of a traditional monitoring system, and realize accurate positioning and rapid alarm of multi-dimensional faults such as network cables, PDU jacks and BMCs.

The invention belongs to the technical field of communication networks, and provides a communication loop fault detection method in a communication network, which comprises the following steps of: starting a link layer neighbor discovery protocol at each physical port of looped network node equipment, and acquiring an opposite-end neighbor equipment identifier and a port identifier which are actually connected with each port; progressive faults such as laser aging and emission light power degradation can be found in time by monitoring the sending light power value of the optical module and the bias current value of the laser in real time, the blind area that a traditional detection mechanism only depends on receiving light power monitoring is broken through, meanwhile, a secondary verification mechanism is arranged, and after degradation of the optical module is monitored, the detection accuracy is improved. According to the method, protection switching is not executed immediately, and whether the link has an actual bidirectional communication fault is further verified through the bidirectional connectivity detection protocol, so that misjudgment caused by short-time fluctuation of parameters of the optical module is effectively avoided, early warning of potential faults is realized, and the reliability of the optical module is improved. And the stability of the network when the optical module is degraded but the link can still perform normal communication is ensured.

The present application relates to the technical field of IPv6 network security, and particularly relates to a method and system for detecting IPv6 neighbor discovery protocol spoofing threats based on probe verification, which probes target IPv6 network data packets, acquires node information of living nodes in a local link, and stores the node information in the link by using a data table; the nodes in the link are divided into host nodes and router nodes according to the node information stored in the data table, authenticity verification is performed on each host node and each router node, and nodes with abnormal authenticity verification are marked; detection rules are set based on authenticity verification results, and pre-defined rules are set based on RFC specifications, and the rules are used to detect spoofing threats of the target IPv6 network, so that corresponding response measures are used to block nodes with suspicious spoofing threat activities. The present application has more comprehensive detection, does not need to know in advance which node information is trusted, has lower complexity, does not need to maintain multiple data tables for recording packets and node information, is convenient for deployment and implementation in actual networks, and has a good application prospect in the field of network security protection.