129 results about "Neighbor Discovery Protocol" patented technology

Described is an internetworking system having various mobile ad hoc extensions to the Internet that are particularly suited to the dynamic environment of mobile ad hoc networks. The internetworking system includes any combination of a link-state routing protocol for disseminating topology and link-state information over a multi-hop network comprised of nodes, a neighbor discovery protocol that can detect the appearance and disappearance of new neighbor nodes, an address format that facilitates deployment of IPv6 nodes in a predominantly IPv4 network infrastructure, a queuing mechanism that can update information upon resuming interrupted communications between nodes, and dynamic network measurement techniques for adaptively using wireless bandwidth when establishing and maintaining connections between nodes and a server.

An Ad-Hoc wireless network according to the present invention employs a TDMA based neighbor discovery protocol, where each network node is assigned a unique time slot to broadcast neighbor discovery packets or messages. A primary controller node is dynamically designated to perform the time slot assignments. A dynamic selection of a secondary or backup controller node is further provided in case of failure of the primary controller node. The present invention further includes flooding techniques based upon TDMA. A TDMA HELLO flood is used to distribute a small number of common parameters to network nodes by placing or piggybacking the information within the neighbor discovery messages. A CNR flood is based on the principles of a RAKE type receiver and used to distribute time slot assignments to the entire network.

An apparatus in a LAN has first and second hardware interfaces to connect to the LAN. First and second monitoring request messages are transmitted to one or more devices in a first VLAN and one or more devices in a second VLAN respectively, via both the first and second hardware interfaces. The monitoring request messages use the Address Resolution Protocol (ARP) or the Neighbor Discovery Protocol (NDP). First and second monitoring response messages are received via the first and / or second hardware interfaces in response to the first and second monitoring request messages respectively. A selection is made between the first and second hardware interfaces for performing data communication, based on the first and second monitoring response messages. The selection is performed independently for data communication via the first and second VLANs based on at least one characteristic of the first and second monitoring response messages respectively.

An Ad-Hoc wireless network according to the present invention employs a TDMA based neighbor discovery protocol, where each network node is assigned a unique time slot to broadcast neighbor discovery packets or messages. A primary controller node is dynamically designated to perform the time slot assignments. A dynamic selection of a secondary or backup controller node is further provided in case of failure of the primary controller node. The present invention further includes flooding techniques based upon TDMA. A TDMA HELLO flood is used to distribute a small number of common parameters to network nodes by placing or piggybacking the information within the neighbor discovery messages. A CNR flood is based on the principles of a RAKE type receiver and used to distribute time slot assignments to the entire network.

The invention discloses an IPv6 over low power wireless personal area network (6LoWPAN) neighbor discovery-based tree routing method, which relates to the field of wireless sensor networks and comprises the following steps of: a, when a 6LoWPAN sensor node is added into the network, establishing a root node of tree topology, and configuring the basic information of the network to the root node; b, adding other ordinary nodes into the network; and c, forming routing. Moreover, the step c comprises the following steps of: under any one of the three conditions of leaf node invalidation or leaving, non-leaf node invalidation or leaving and node movement, triggering a routing restoring process; and under any one of the three conditions of no leaf node invalidation or leaving, no non-leaf node invalidation or leaving and no node movement, finishing the processing. In the 6LoWPAN neighbor discovery-based tree routing method, an additional routing protocol message is not required to be transmitted and received, so the bandwidth and the routing calculation overhead are reduced, energy consumption produced in the message transmission of the nodes is saved, and the energy consumption and routing overhead of the whole network are further reduced.

The invention discloses a method for preventing neighbor discovery (ND) attack. The method comprises the following steps: accessing a switch to receive an ND message from a terminal; extracting the identity information of the terminal from the ND message; judging whether the terminal is a legal authenticated terminal or not according to the identity information of the terminal; and upgrading a self ND SNOOPING item when the terminal is the legal authenticated terminal. The invention integrates an authentication mechanism with the ND SNOOPING to improve the safety of an ND item-studying mechanism and prevent common ND attacks, and the like.

A method for performing neighbor discovery in a multi-tier wireless local area network where a client creates a neighbor list identifying a neighbor wherein the neighbor is identified as an access point or a client. Then, the client determines a time to perform a scan of neighbors based upon 1) a type of neighbor discovery to be performed and 2) when a first beacon is transmitted by an access point in a first tier of the multi-tier wireless local area network. Subsequently, the client performs a scan of neighbors at the determined time on a channel associated with the type of neighbor discovery. Finally, the client receives a beacon sent from a neighbor of the client to update the neighbor list with information transmitted in the beacon.

The invention discloses a synergic prime number based asymmetric low duty period neighbor discovery method. The method comprises the steps of selecting a corresponding duty period according to an energy requirement and a delay requirement of a mobile node; according to the duty period, selecting different parameters to arrange positions of an anchor time slot, a probe time slot and a prime number time slot and establishing a neighbor discovery scheduling table; and finishing neighbor discovery by the mobile node according to the neighbor discovery scheduling table. According to the method, a single synergic prime number is used, so that the quick asynchronous neighbor discovery can be finished within a bounded discovery delay, the number of optional duty periods is increased, and energy distribution is flexible. On the asymmetric low duty period condition, the low energy cost of the mobile node can be guaranteed, and the worst discovery delay can be shortened.

The invention discloses a long-distance wireless multi-hop data polling method for transparent transmission equipment, which is realized by a wireless multi-hop data polling network consisting of data aggregation nodes and data transmission nodes. The data transmission nodes are accessed to the prior data polling network through a neighbor discovery protocol. The data aggregation nodes poll the data transmission nodes through a multi-hop data polling protocol sequentially, namely the data aggregate nodes send data requests to the destination data transmission nodes, and the data transmission nodes, and send data response packets to the data aggregate nodes after receiving data request packets. The data request packets and the data response packets are transmitted to destination nodes by a plurality of relay nodes in a link layer. In the data polling network, nodes acquire link quality information of the surrounding neighbor nodes through link quality estimation and send the link quality information to the data aggregate nodes. The data aggregate node can calculate the best route for each data polling through aggregated link quality information.

Beacons may be grouped to facilitate neighbor discovery in a wireless network. For example, neighboring access devices such as IEEE 802.11 access points may cooperate to transmit beacons in a group. In this way, a wireless device seeking to discover the neighboring access devices may scan for the beacons for a shorter period of time. An indication may be provided to enable a wireless device to more efficiently scan the beacons. For example, the indication may indicate the channel the wireless device should scan to receive the next beacon that is to be transmitted. In addition, the indication may include information relating to the transmission time of the next beacon.

Methods and apparatus for using end nodes, e.g., wireless terminals, to discover base stations and communicate information about discovered access nodes, e.g., base stations, to other access nodes in a system are described. As the wireless terminal roams in the system and new access nodes are encountered, one or more physically adjacent access nodes will be informed of the presence of the new access node as a result of communications with the wireless terminal. A message indicating an access node's inability to route a message to another access node which is known to a wireless terminal may trigger the wireless terminal to begin the process of updating access node routing and neighbor information.

A protocol for discovering a silent device, such as a printer, attached to a mobile port of a switching node. A command is transmitted to the switching node for associating an IP address for the silent device to a particular virtual local area network (VLAN). Entry of the command causes the switching node to start searching for the silent device on the mobile ports. As part of the searching process, an ARP request with the IP address provided in the command is sent to each mobile port of the switching node. When the silent device responds with its MAC address in an ARP reply message, the MAC address is learned in a layer 2 table used for making forwarding decisions of data units received by the switching node. Furthermore, the port where the silent device was discovered, that is, the port receiving the ARP reply message, is associated with the VLAN of the silent device.

The invention provides a network assisting management device and a concurrent management device that are applied to a video management server and front-end equipment respectively. The concurrent management device comprises an information collecting unit and an access management unit, wherein the information collecting unit is used for obtaining an IP (Internet Protocol) address and an access port identification of an access switch in a signalling message of the front-end equipment, and the access management unit is used for generating a network management command of an access port corresponding to the video front-end equipment, and carrying the network management command in a network management message to be sent to the access switch. The assisting management device comprises a neighbor listening unit and an information reporting unit, wherein the neighbor listening unit is used for obtaining the IP address and the access port identification of the access switch from the access switch through a neighbor discovery protocol, and the information reporting unit is used for carrying the IP address and the access port identification of the access switch in a video monitoring signalling message to be sent to the video management server. According to the network assisting management device and the concurrent management device, the access switch is managed through linkage, and a monitoring service and a network are fused effectively.

The invention provides a neighbor discovery method and device. Part of the process of an OpenFlow controller for collecting network topology is shared by an OpenFlow device, and the network topology is reported by the OpenFlow device actively, so that the network topology collecting time of the OpenFlow controller is shortened, and message interaction between the OpenFlow controller and the Openflow device is effectively reduced.

The invention relates to an IPv6 (Internet protocol version 6) industrial wireless sensor network routing method based on definiteness scheduling and belongs to the technical field of industrial wireless sensor networks. The method is based on 6LoWPAN and definiteness scheduling of industrial wireless sensor networks, and adaptation layer protocol and neighbor discovery protocol are modified according to 6LoWPAN serial protocol standards. Scheduling time and channel quality are used as path selection standards according to application requirements of industrial wireless sensor networks. An optimal path simultaneously satisfying two routing standards is selected for data with marked definiteness features in a distributed manner, and accordingly definiteness, instantaneity and reliability requirements of industrial application are met. By the method, definiteness of an industrial wireless sensor network can be guaranteed effectively, and overall communication performance of the network is improved.

The invention discloses a LoWPAN (low-power wireless personal area network) node secure access control method based on neighbor discovery. The LoWPAN node secure access control method based on neighbor discovery solves the problem of communication security of 6LoWPAN (IPv6over LoWPAN) links. By means of optimization on RS (router solicitation) and RA (router advertisement) messages in a router discovery protocol, security authentication when new nodes are added into a network is achieved effectively, and whether the messages in the network are tampered or not is detected. By means of secure access control of a new node, an authentication address IP (internet protocol) list is maintained commonly within a network range, and attack and masking of malicious nodes can be prevented within the whole network range. The LoWPAN node secure access control method based on neighbor discovery has the advantages that the method is put forward based on an NDP (neighbor discovery protocol) of the 6LoWPAN, redefining new protocol types is not needed, and the method is higher in extendibility, easier to popularize and particularly applicable to sensor networks limited in resource energy.

The invention discloses a technical proposal for implementing load sharing based on anycast technique, which combines various servers to be load-shared to form an anycast group, allows the retransmission device to obtain the resource state of the server based on the neighbor discovery protocol of the anycast technique, the retransmission device connected with anycast group serves as dispatching device and receives the message from the anycast group and then transfers the received message according to the resource state of each server recorded in the anycast neighbor list, completing the load sharing. The implementation of the load sharing purpose is dependent on the complete utilization and improvement of the existing anycast technique in the inventive technical proposal, therefore, the invention can reduce the system overhead required for load sharing in a certain extent and greatly reduce the waste of system resources.

A method utilizing router advertisement carrying options to issue network address translator (NAT) 64 address prefix transformation from internet protocol (IP) v6 addresses to IPv4 addresses. The method comprises the following operation steps of : (1) arranging a route advertisement into a mode of carrying a preset network address transforming NAT data option; (2) issuing network configuration information; (3) inquiring addresses; (4) synthetizing addresses; (5) initiating conversations; and (6) establishing conversions. The method utilizes an inherent technology of IPv6, namely sending of route advertisement in a neighbor discovery protocol in internet control messages protocol, and utilizes corresponding devices provided in all IPv6 subnets. The route advertisement is utilizes to issue prefixes, AAAA type addresses are then synthesized locally, accordingly requirement of user host machines on network service ability is lowered, and access of the user host machines to outer net resources is not necessarily supported by relying on protocols which are complicated in technology and high in network service capability requirements such as dynamic host configuration protocol (DHCP) v6. Moreover, the method is simple and convenient in operation steps, easy to achieve and good in popularization and application prospect.

The invention discloses a redundancy method of an IPv6 router suitable for a tree type wireless sensor network, and belongs to the technical field of the wireless sensor network. Based on 6LoWPAN and the tree type routing technology of the wireless sensor network, an IPv6 neighbor discovery protocol is modified according to the 6LoWPAN series protocol standard. The router establishes a self redundancy router from a neighboring router by combining the characteristic of dense deployment of nodes of the industrial wireless sensor network, and when the router does not work, the redundancy router acts on behalf the router transparently to carry out data routing forwarding work. Meanwhile, when the router out of operation recovers a normal working state, the redundancy router automatically stops the proxy work. The redundancy method of the IPv6 router suitable for the tree type wireless sensor network can effectively solve the problem that descendant nodes can not communicate due to failure of the router in the tree type network, thereby realizing the IPv6 wireless sensor network routing technology simultaneously meeting the requirements for reliability, real time performance and small expenditure of industrial application, and improving the overall reliable communication capacity of the network.

The invention discloses a method for processing a neighbor discovery protocol item and three-layer switching equipment. The method comprises the following steps of: after a neighbor cache list item of the three-layer switching equipment in a protocol control layer is changed into a stale state from a reachable state, detecting whether a data forwarding layer uses a message transceiver of an IP address of a forwarding list item corresponding to the neighbor cache list item, and if so, placing the neighbor cache list item in a delay state. The method realizes item state synchronization of a neighbor cache list and a forwarding list, completes the stale detection of a protocol control level in the neighbor discovery protocol, and improves the reliability and efficiency of data communication.

The invention discloses a neighbor discovery protocol graceful restart (GR) processing method and a device. The method comprises the steps that: GR equipment is determined to carry out active-standby switching, and messages used for informing neighbor GR equipment that the GR equipment carries out the active-standby switching is sent to the neighbor GR equipment; the GR equipment starts a timer to start timing, wherein the time of the timer of the GR equipment is not shorter than the time required by the active-standby switching of the GR equipment; and the GR equipment does not send reachability detection message before the timer exceed the time, and the active-standby switching of the GR equipment is completed. Through the neighbor discovery protocol graceful restart processing method and the device, the GR process is ensured to be successfully completed.

The invention provides an implementation method and device for an IPv6 (Internet Protocol Version 6) neighbor discovery protocol in a WLAN (Wireless Local Area Network). The method comprises the following steps of: storing each wireless client side-belonged logic group associated to an AP (Assess Point) in the AP in advance, wherein the wireless client side comprises a host computer and a router; and confirming a message-belonged logic group when the AP receives a neighbor discovery protocol-related message sent by the wireless client side or a wired network in a multicast manner, and respectively sending the message to other wireless client sides same as the message-belonged logic group in a unicast manner according to each pre-stored wireless client side-belonged logic group associated to the AP. When the method is adopted, normal operation of the neighbor discovery protocol in the WLAN can be realized.

The invention discloses a low-power Bluetooth IPv6 address automatic configuration method based on 6LoBLE. The low-power Bluetooth IPv6 address automatic configuration method is implemented based on alow-power Bluetooth neighbor discovery protocol, and applied to the communication connection between low-power Bluetooth equipment and Internet equipment. Communication equipment comprises broadcasting equipment, scanning equipment and the Internet equipment; and the broadcasting equipment and the scanning equipment are both low-power Bluetooth equipment. The method comprises a connection processof the broadcasting equipment and the scanning equipment, and an IPv6 address configuration process of the scanning equipment; the connection process of the broadcasting equipment and the scanning equipment is as follows: transmitting a header of a broadcast data packet and a header ADV-EXT-IND data packet of an extended broadcast data packet on a main broadcast channel to the scanning equipmentby the broadcasting equipment, and completing the reception of a Connect-Req data packet on a transmission channel by the scanning equipment according to the transmission time of a specified payload to realize connection; and the IPv6 address configuration process comprises the establishment of the connection, address registration, 6LoBLE communication and prefix updating. The low-power BluetoothIPv6 address automatic configuration method based on the 6LoBLE provided by the invention has an important promoting effect on smart home, Internet of Vehicles and adapting to fast moving Internet ofThings applications.

The invention discloses a neighbor discovery method for a mobile ad hoc network based on a directional antenna. By adoption of the neighbor discovery method, the technical problem of low neighbor discovery efficiency of the existing network neighbor discovery method is solved. The technical scheme is as follows: in every neighbor scanning process, each node discovers a certain number of neighbors, so the node can use the existing neighbor information to accelerate the neighbor discovery process. As the existing neighbor information is used, neighbor tables are continuously exchanged, compared with the method in the background art, the method has the advantage that the existing information is fully used, and whether a neighbor relationship exists is directly judged by an algorithm, therefore the time of active scanning detection is shortened. Compared with the background art, the method has the advantages that the neighbor discovery time is greatly shortened, and the neighbor discovery efficiency is improved.

The invention discloses a method for realizing integrated management of a multi-board embedded device and aims to provide an automatic control method which relates to the fields of multi-board cooperative control and embedded control and is implemented through a WEB interface and a command line interface (CLI). The key points of the technical scheme are that: a main management device is connected with each sub-device through a network interface; the management address of the sub-device and user login information are transmitted to the central processing unit (CPU) of the main management device through a neighbor discovery protocol; the ID and address information of the sub-device is automatically configured and saved in the main management device; and when the sub-device needs accessing, automatic connection to the sub-device can be realized through the WEB interface or the CLI interface of the main management device without artificially memorizing the address of the sub-device. The method has the advantages of solving the problem of management redundancy of the embedded multi-board device, lowering the address management difficulty of a plurality of boards, enhancing the cooperative capacity of a system and realizing centralized management of the plurality of boards along with convenient use.

The invention discloses a neighbor discovery method and a device which are used from the user mobile terminal device and the user mobile terminal device communication system. The communication system comprises a plurality of eNode Bs and a plurality of user mobile terminal devices. The neighbor discovery method comprises steps of receiving the system information of the system of the corresponding eNode Bs from the plurality of the eNode Bs at each user mobile terminal device of the plurality of user mobile devices, wherein the system information comprises the configuration information for indicating how the plurality of neighbor discovery channels are configured in the wireless resources, selecting the corresponding neighbor discovery channel from the plurality of neighbor discovery channels based on the configuration information in the system information at each user mobile terminal device, transmitting the corresponding beacon signals (eg. neighbor discovery signals) on the selected neighbor discovery channel at each user mobile terminal device, and receiving the beacon signals from the neighbor user mobile terminal device of the user mobile terminal device on the unselected neighbor discovery channel. The neighbor discovery method and the device can achieve good detection performance.

A User Services Platform endpoint determines that applicable services are available for a connected device attached to a local network based on a neighbor discovery protocol message from the connected device; and outputs a User Services Platform device notification message to a User Services Platform endpoint associated with the local network. A User Services Platform administrative authority endpoint device determines an applicable service for a connected device based on a User Services Platform message identifying the connected device; provisions service elements for the applicable service to a User Services Platform endpoint associated with the applicable service and the connected device, the service elements enabling the User Services Platform endpoint to implement the applicable service in association with the connected device; and receives notification that the service elements for the applicable service have been provisioned at the User Services Platform endpoint.

The invention discloses a neighbor discovery proxy method and a system based on DHCPv6 monitoring, wherein the method comprises that an access switch which has a DHCPv6 monitoring function monitors an address request process of a DHCPv6 client, creates binding information and configures an Internet Protocol (IP) for an aggregation switch; the access switch uploads the binding information to the aggregation switch which has a neighbor discovery proxy function through a binding message according to the configured IP address of the aggregation switch; the aggregation switch extracts the binding information from the binding message so as to update a binding information table; and the aggregation switch inquires whether an objective ID of a neighbor request message which meets the conditions of neighbor discovery proxy exists in the binding information table or not, and the aggregation switch sends a neighbor advertisement message to a terminal if the objective ID exists. The method and the system overcome the defect that an objective terminal exists in the neighbor table of the DHCPv6 client but can not be communicated with actually.

The invention relates to a node safety registration method based on 6LoWPAN neighbor discovery. ARO suggested by an RFC775 is improved, and the corresponding relation between added DID fields and corresponding SLLAO option address fields is utilized to realize safety registration of nodes. The process of NS / NA carrying related ARO and SLLAO options with the DID fields to carry out address registration specifically comprises 6 specific steps. Only 2 bit of frame options are added to the ARO, other fields are not changes, so that fusion with existing networks is easy, and the popularization is good. A plurality of times of NS / NA message interaction are carried out between a 6LN and a 6LR, and the safe registration of the 6LN under dummy node interference can be still realized without adding a password generation function to the 6LN. The nodes are provided with a network attack prevention self-recovery capability by means of the improved ARO frame format, and the problem of IPv6 address waste under an RFC6775 standard is simultaneously overcome. In the node registration process, the transmission of original 128 bits in each time is shortened to 48 / 16 bits, the occupation of the network bandwidth is reduced, and the network efficiency is improved.

The invention provides a discovery resource adaption mechanism used in a LTE D2D. In user equipment, according to a neighbor detection and discovery result, adaptive adjustment is performed on a discovery sending period. And a base station carries out reconfiguration on a neighbor discovery resource according to a user report. The mechanism is characterized in that during a neighbor discovery process, in each neighbor discovery period, according to the neighbor detection and discovery result, a first parameter is calculated and the first parameter is compared to a first threshold and a second threshold; when a frequency that the first parameter is greater than or equal to the first threshold is greater than or equal to a first preset value and a current discovery period of the user equipment is less than a maximum value of an optional discovery period, the user equipment increases a length of the discovery period; or when a frequency that the first parameter is less than or equal to the second threshold is greater than or equal to a second preset value and the current discovery period of the user equipment is greater than a minimum value of the optional discovery period, the user equipment reduces the length of the discovery period.