263 results about "Broadcast address" patented technology

The discovery and configuration of devices of interest connected to the Ethernet by an Ethernet port is disclosed. To perform discovery, Client software in a management interface transmits packets including the address of the management interface and a port identifier to a known broadcast address, requesting the MAC address for all devices of interest. Server software in the devices of interest parse the broadcast packets and broadcast a packet containing a MAC address that uniquely identifies the devices of interest back to the Client. Once the MAC addresses are returned to the Client, the Client can then broadcast protocol packets requesting the configuration of a specific device of interest such as a new IP address. Once a device of interest is configured with at least an IP address, the device of interest can communicate using TCP / IP, and it can thereafter be managed using higher level tools and firmware.

A system for automatically encrypting and decrypting data packet sent from a source host to a destination host across a public internetwork. A tunnelling bridge is positioned at each network, and intercepts all packets transmitted to or from its associated network. The tunnelling bridge includes tables indicated pairs of hosts or pairs of networks between which packets should be encrypted. When a packet is transmitted from a first host, the tunnelling bridge of that host's network intercepts the packet, and determines from its header information whether packets from that host that are directed to the specified destination host should be encrypted; or, alternatively, whether packets from the source host's network that are directed to the destination host's network should be encrypted. If so, the packet is encrypted, and transmitted to the destination network along with an encapsulation header indicating source and destination information: either source and destination host addresses, or the broadcast addresses of the source and destination networks (in the latter case, concealing by encryption the hosts' respective addresses). An identifier of the source network's tunnelling bridge may also be included in the encapsulation header. At the destination network, the associated tunnelling bridge intercepts the packet, inspects the encapsulation header, from an internal table determines whether the packet was encrypted, and from either the source (host or network) address or the tunnelling bridge identifier determines whether and how the packet was encrypted. If the packet was encrypted, it is now decrypted using a key stored in the destination tunnelling bridge's memory, and is sent on to the destination host. The tunnelling bridge identifier is used particularly in an embodiment where a given network has more than one tunnelling bridge, and hence multiple possible encryption / decryption schemes and keys. In an alternative embodiment, the automatic encryption and decryption may be carried out by the source and destination hosts themselves, without the use of additional tunnelling bridges, in which case the encapsulation header includes the source and destination host addresses.

In methods and apparatus for routing packets through a communications network, a respective distinct broadcast address is assigned to each of a plurality of distinct sets of virtual ports. No virtual port belongs to more than one of the distinct sets. A respective egress address is assigned to each packet entering the network via an ingress virtual port. The respective egress address corresponds to a respective destination address of the entering packet when a correspondence between the destination address and an egress address is known. When no correspondence between the destination address and an egress address is known, the respective egress address is a broadcast egress address corresponding to the set comprising the ingress virtual port. The packet is routed according to the respective egress address. The routing is restricted to virtual ports belonging to the distinct set of virtual ports that includes the ingress virtual port. The distinct sets of virtual ports and their associated broadcast addresses define isolated virtual private networks within the network. Each physical port of the network may map one-to-one onto a corresponding virtual port, or may map onto a corresponding plurality of virtual ports, in which case the each virtual port of the plurality is associated with a respective distinct combination of a physical address of the physical port and a respective virtual network identifier.

A method and system for an aggregated virtual local area network (VLAN) architecture in which several VLANs in a network share the same default router address and subnet mask, but remain isolated from one another's network traffic. Instead of the traditional method of assigning one subnet to a VLAN, each VLAN is assigned only a portion of a subnet's IP address space, and is further grouped into a super-VLAN uniquely associated with that subnet. Intra-VLAN traffic is forwarded only to host IP addresses assigned to that same VLAN according to a VLAN identifier carried in the data packet. Inter-VLAN traffic is processed by a virtual router interface which routes the data packet by applying the routing configuration for the subnet uniquely associated with the super-VLAN, according to a super-VLAN identifier carried in the data packet. The routing configuration used by the virtual router interface includes routing protocols, static routes, redundant router protocols and access-lists. Since each VLAN shares the same virtual router interlace, the traditional address overhead of a subnet is minimized, requiring only one default router and subnet mask, as well as only one pair of subnet broadcast addresses for all hosts on the subnet and the subnet itself. The aggregated VLAN architecture provides for the efficient use and management of a network's IP address space.

Methods, apparatus, system and computer program are provided for concealing the identity of a network device transmitting a datagram having a network layer header. A unique local identifier and broadcast address are determined in accordance with a next-hop address. A partially encrypted network layer header is determined by encrypting a plurality of identifying portions of the network layer header, where one portion of the network layer header is the unique local identifier. The datagram is encapsulated with another network layer header whose address is set to the broadcast address. The encapsulated datagram can be received and detunneled, and an address of a recipient can be extracted from the network layer header. The datagram is then admitted into a network domain.

There are disclosed a method and device for searching equipment, such as a printer, connected to a network through a router by using a broadcast packet are disclosed. A host 110 acquires routing information from a router 200. The host 110 analyzes a domain name of a sub network B103 in the routing information so as to acquire a broadcast address in the domain, then, send a broadcast packet requesting a printer name addressed to the broadcast address through the router 200. The host 110 searches a printer 120 by receiving a response packet for the broadcast packet.

A heterogeneous point-to-point links involves different technologies at it two ends, e.g., Ethernet at one end and ATM or Frame Relay at the other end. If two IP systems are connected via a heterogeneous point-to-point link, each may be using different address learning techniques. It is up to the Provider Edge devices to make these different techniques inter-work. A novel provider edge device and procedures that the edge device it to perform for forwarding packets properly are described. According to the invention, the provider edge device uses a broadcast address to forward the packet in one direction toward a customer edge device. In another direction, the provider edge device responds to an ARP request from the customer edge device with its own MAC address so that it can receive a packet from the customer edge device.

A system and method for of maintaining privacy in a wireless network is provided. A wireless communication device may transmit, to a broadcast address, a plurality of messages using a respective plurality of source identifiers. A response to at least one of the plurality of messages may be received. A predefined source identifier is used to establish a link. Other embodiments are described and claimed.

Some embodiments provide a method for detecting a failure of a layer 2 (L2) bump-in-the-wire service at a device. In some embodiments, the device sends heartbeat signals to a second device connected to L2 service nodes in order to detect failure of the L2 service (e.g., a failure of all the service nodes). In some embodiments, the heartbeat signals are unidirectional heartbeat signals (e.g., a unidirectional bidirectional-forwarding-detection (BFD) session) sent from each device to the other. The heartbeat signals, in some embodiments, use a broadcast MAC address in order to reach the current active L2 service node in the case of a failover (i.e., an active service node failing and a standby service node becoming the new active service node). The unidirectional heartbeat signals are also used, in some embodiments, to decrease the time between a failover and data messages being forwarded to the new active service node.

The invention discloses an address automatic allocation method. A Modbus master station sends broadcast address setting commands and sets station addresses of all Modbus slave station devices as the same fixed address; broadcast Modbus slave station device serial number read commands are sent; the Modbus slave station devices return messages responding to the Modbus slave station device serial number read commands; the Modbus master station broadcasts and issues slave station address setting commands carrying the slave station device serial numbers and the slave station addresses in sequence,according to a list of the received Modbus slave station device serial numbers; and the Modbus slave station devices analyze the slave station device serial numbers and the slave station addresses, and if the slave station device serial numbers are equal to own serial numbers, own slave station addresses are modified, thereby realizing address automatic allocation. The invention also provides an address allocation Modbus master station and Modbus slave station applicable to a Modbus protocol, and a system.

The invention discloses a method for achieving load balancing of a server cluster. The method for achieving the load balancing of the server cluster includes the following steps that the client broadcasts address resolution protocol request to the server cluster, a load balancing server identifies the address resolution protocol request, and the load balancing server feeds back an physical address to the client when the load balancing server is matched with the address resolution protocol request; the client transmits a service request to the load balancing server according to the physical address of the load balancing server; the load balancing server dispatches the service request to a node server to be processed, wherein the node server is connected with the load balancing server and load value of the node server is the smallest; and after the node server processes the service request, the node server transmits an obtained data package to the client. The method for achieving the load balancing of the server cluster achieves effects of rational utilization of resources and system performance optimization of the server cluster.

Methods, apparatus, system and computer program are provided for concealing the identity of a network device transmitting a datagram having a network layer header. A unique local identifier and broadcast address are determined in accordance with a next-hop address. A partially encrypted network layer header is determined by encrypting a plurality of identifying portions of the network layer header, where one portion of the network layer header is the unique local identifier. The datagram is encapsulated with another network layer header whose address is set to the broadcast address. The encapsulated datagram can be received and detunneled, and an address of a recipient can be extracted from the network layer header. The datagram is then admitted into a network domain.

The invention discloses an address allocation method and device for air conditioning equipment. The method comprises the steps that a main machine in an air conditioning unit allocates instructions to broadcast addresses a slave machine unit, wherein multiple slave machines included in the slave machine unit and the main machine belong to a same communication network; the main machine receives identity information returned by the first slave machine according to the address allocation instructions, wherein the first slave machine is any one slave machine in the slave machine unit; the main machine generates an address to be allocated to the first slave machine according to the returned identity information; the main machine sends the address to the corresponding first slave machine. According to the address allocation method and device for the air conditioning equipment, the technical problem that in the prior art, the installation efficiency is low due to the fact that when RS484 buses are adopted to perform data communication among different equipment in the air conditioning unit, a dip switch needs to be manually arranged in the engineering installation process of the air conditioning unit is solved.

The invention is an Internet access system that puts together interactivity of the Internet and congestion-free content delivery inherent in broadcast media in order to reduce delays in content presentation. The system delivers any web object (web page, music file, video etc.) in two steps. First, a single copy of object is downloaded according to a standard Internet protocol into a server provided at a broadcast center no matter how many client computers have requested the object; then the copy is transmitted over a broadcast channel according to a data broadcast protocol so that all clients could download it simultaneously. A web object is transmitted as a flow of packets and the transmission is preceded with an announcement specifying a broadcast channel and a flow number. The packet header contains a flow number and a destination address that could be a client address or a broadcast address, thereby enabling an efficient handling of both one-to-one and one-to-many transmissions. The system provides, when necessary, a protection of transmitted content against unauthorized reception by biding packets identity and transmitting packets of the same content over different, pseudorandomly changing channels.

The invention discloses an automatic identification method of an electric power meter on RS-485 bus, wherein different protocols and communication rates are used for the following operations: firstly using broadcast address to distribute a reading meter order by a collecting apparatus; then if no response received, no electric power meter in match condition exists; if correct response is received, acquiring a meter address from a response message to be added into a meter address list of the collecting apparatus; if a messy code response which is not matched with the response format in the protocol is received, a plurality of electric power meters in match condition exist, taking AAAAAAAAAAAA as initiation meter address, and entering recursive query test; and after the test completes, converging to obtain a group of electric power meter address, protocol and communication rate list. The application of the identification method can save corresponding artificial maintaining work.

The embodiment of the invention provides a live broadcast audio switching method, a stream media server and a client. The method comprises following steps: obtaining multi-way live broadcast audios; allocating corresponding live broadcast addresses to each way of live broadcast audios; adding description information of each way of live broadcast audios, and the corresponding relation between the description information of the live broadcast audios and the live broadcast addresses in live broadcast element data; sending the live broadcast element data to the client; monitoring a selection instruction returned by the client; if the selection instruction returned by the client is received in a preset time, setting the live broadcast address corresponding to the description information of the live broadcast audios appointed by the selection instruction as an current live broadcast address; and the live broadcast audios corresponding to the current live broadcast address to the client. According to the method, the server and the client provided by the invention, the technical effect that a user can independently select the live broadcast audios in the same one live broadcast is realized.

The invention discloses a multimedia live broadcast method and device and belongs to the Internet technical field. The method includes the following steps that: a multimedia live broadcast stream access request transmitted by a commenting terminal is received, wherein the multimedia live broadcast stream access request carries the live broadcast address of a live broadcast user; based on the live broadcast address, the first multimedia live broadcast stream of the live broadcast user is transmitted to the commenting terminal, and the commenting terminal is made to add comment information into the first multimedia live broadcast stream, so that a second multimedia live broadcast stream can be obtained, and the commenting terminal returns the second multimedia live broadcast stream; when the second multimedia live broadcast stream transmitted by the commenting terminal is received, the second multimedia live broadcast stream is transmitted to a view user terminal, so that multimedia live broadcast can be realized. With the multimedia live broadcast method and device of the invention adopted, a remote commenting process of multimedia live broadcast streams can be realized, and the efficiency of the multimedia live broadcast can be improved.

Systems, methods and apparatuses for binding two or more communication devices through their common association with one or more other devices. Information associated with a common device is stored at a first device. The information associated with the common device is also stored at a second device. A message is transmitted from the first device using the stored information as at least part of a broadcast address identifier. The message can then be accepted at the second device as a result of the information being known to the second device. A “binding by association” is thus effected by virtue of each of the first and second devices having been privy to the same information affiliated with the common device.

In an access point device, a controller controls a wired interface communicating on wire with a network switcher accommodating access point devices and a wireless interface communicating wirelessly with a wireless terminal device located in its service area. Services are handed over between the access point devices responsively to the wireless terminal device moving. Access point devices before and after the handover of services are defined as a handover source and a hand over destination, respectively. A hand over at the hand over destination causes a data frame to be generated containing the MAC address of the wireless terminal device as a source address, a broadcast address as a destination address and address information of its own device. A table holds terminal connection information defining the relationship of the MAC address to the IP address of the wireless terminal device. The data frame is transmitted to the network switcher through the wired interface.

Method for broadcasting addressed data to a multiplicity of users via various broadcasting channels. The method includes setting up at least one information data base, which contains data that are intended to be transmitted through at least one of the broadcasting channels, the stored data from a multiplicity of information suppliers being transmitted through at least one communication channel into the information data base, storing of transmission criteria for each user or each user group, the transmission criteria including indications about the data from the information data base that have to be transmitted to each user or each user group, as well as an indication about the selected broadcasting channel, and automatic selection of the data to be transmitted according to the stored transmission criteria, and transmission of this data to the user or to the user group through the selected broadcasting channel.

In receiving a MAC (media access control) frame whose destination address is any of a broadcast address, an unknown multicast address and an unknown unicast address, the flooding is reduced by broadcasting the received MAC frame to all the other ports than one that has received the MAC frame. An output control that attains this object is realized by using a destination group identifier (ID) look-up table (2-T1) which enables a look-up of a destination group ID by using, as a key, any one or combination of header information of the MAC frame, a port which received the MAC frame and a service VLAN (virtual local area network) ID corresponding to the MAC frame and a backbone port look-up table (2-T2) which enables a look-up of at least one backbone port which is to transmit or at least one backbone port which is not to transmit by using the destination group ID as a key.

The present invention relates to a distribution method for equipment node address codes, comprising the following steps that: an address configuration node in a system configures starting signals are allocated for each equipment node broadcast address; the equipment nodes receives the starting signals and respectively returns a unique confirmation code to the address configuration node; the address configuration node distributes unique equipment node address codes, and broadcasts the equipment node address codes as well as the confirmation codes; the equipment nodes determine that the confirmation codes accord with the own confirmation codes, and saves the equipment node address codes. Meanwhile, the present invention also discloses a distribution system for equipment node address code, as well as an address configuration node. The present invention solves the problem that the prior art is high in error rate when setting address codes, and has the advantages of easy realization, low cost, low error probability, etc.

The invention provides a control method for IP group broadcast precise relay, the steps include: 1. the group broadcast model sets up route between the source and the orderer, and sets up the relay table; 2. when group broadcast comes, it examines if the IP package legal or not, if legal then carries on following step; 3. searches three-layer table according to the source address and group broadcast address, if acquires the relay index then enters next step; 4. judges if the sign in three-layer valid or not, if yes, enters next step; 5. searches group broadcast relay table, examines if the source port matches with VLAN, if yes, next step; 6. searches group broadcast relay table, if source port and target port are in the same VLAN, carries on two-layer relay; if not, carries on the three-layer relay.

A method and apparatus that operates two bridging protocols in a hybrid bridging node is described. The operation of the two bridging protocols in the hybrid node allows for an incremental transition of a provider bridging network from operating a legacy bridging protocol that shares MAC addresses to a bridging network that operates VPLS and / or PBB bridging protocols. The hybrid bridging node selectively broadcasts address resolution packets and unicast packets with unknown MAC addresses from the nodes operating VPLS and / or PBB to nodes operating a legacy bridging protocol.

The invention discloses a communication apparatus of a ground station and a pairing method thereof. The apparatus comprises: a ground terminal, which is connected with an intelligent terminal and is used for realizing forwarding of a flight control instruction of the intelligent terminal and state information of a flight controller based on a communication link established between the ground terminal and a plane terminal; and a plane terminal, which is connected with the flight controller and is used for writing the control instruction of the intelligent terminal into the flight controller and reading the state information of the flight controller based on the communication link established between the ground terminal and the plane terminal. The method includes: the ground terminal receives a pairing request instruction sent by the intelligent terminal and broadcasts a pairing request message externally and circularly at a certain interval according to a broadcast address; and when the plane terminal monitors the pairing request message and carries out processing on the content of the pairing request message, the ground terminal receives a pairing confirmation message sent by the plane terminal. According to the invention, the flight control instruction can be uploaded to the flight controller and the state information can be downloaded from the flight controller.

Embodiments of the invention relate to routing promotion content files to groups of end node devices having the same or similar device attributes, such as data storage capacity, called transmission groups. Specifically, a promotion is assembled into one or more data packages, with a package being created for each different transmission group. Promotions may be aggregated, with multiple promotions being placed in each package. The packages may include information such as promotion identification, start time, end time, duration, port number, multicast or broadcast address to facilitate bulk data routing via broadcast or multicast. The packages are then used to generate and deliver promotion schedules to each device of a transmission group and to schedule bulk data transmissions to the respective transmission groups via separate broadcast or multicast for each package.

The transmission of unnecessary assignment and validation information to mobile terminals in wireless IP networks is automatically blocked. Assignment and validation information originating with a mobile terminal is discarded by a base station if the information is not directly received by the base station from a mobile terminal. Assignment and validation information originating with an IP address server is broadcast only to those mobile terminals awaiting assignment or validation information using a local broadcast IP address. The validation and assignment is automatically begun once a mobile terminal enters a new subnet by resetting the mobile terminal's IP address to the broadcast address for assignment and validation requests and then broadcasting validation and, if necessary, assignment requests to the wireless IP network.

The present invention discloses a technique to reduce packet loss during the handover of a mobile terminal and to eliminate wasteful consumption of band. According to this technique, a connection station 103 and a radio base station 104 where a mobile terminal 100 is connected generate a plurality of own MAC addresses based on identification information of the mobile terminal, and when the handover is started, a network management unit 106 makes up a point-to-multipoint VLAN path where VLAN path between new radio base station device and the connection station device is added to the VLAN path between previous radio base station device and the connection station device, and the connection station device adds a broadcast address, a MAC address of the connection station device, and an identification information of the mobile terminal to a packet received from the external IP network 101, and the packet is transferred via the point-to-multipoint VLAN path.

The invention discloses a method for achieving the address resolution protocol proxy through a two-layer virtual local area network and a local area network system. The method comprises the steps that an IP stack is configured in drive of the two-layer virtual local area network; the address resolution protocol proxy function is configured on the virtual local area network; a message is received, and an address resolution protocol request is sent to a corresponding virtual local area network according to a matched virtual local area network tag; whether a computer requested by the address resolution protocol and the two-layer virtual local area network are the same network segment or not is judged, if not, the request is ignored, and if yes, the two-layer virtual local area network feeds media access control of the two-layer virtual local area network back to the computer; the two-layer virtual local area network broadcasts the address resolution protocol request; the two-layer virtual local area network receives the response to the address resolution protocol; routing information is written in a forwarding table. According to the method, user configuration is simplified, the virtual local area network with the routing function is built by configuration of the IP and the address resolution protocol proxy, the two-layer or three-layer virtual local area network does not need to be designed much, the internal processing procedure is optimized, and the processing time of the system is saved.

The discovery and configuration of devices of interest connected to the Ethernet by an Ethernet port is disclosed. To perform discovery, Client software in a management interface transmits packets including the address of the management interface and a port identifier to a known broadcast address, requesting the MAC address for all devices of interest. Server software in the devices of interest parse the broadcast packets and broadcast a packet containing a MAC address that uniquely identifies the devices of interest back to the Client. Once the MAC addresses are returned to the Client, the Client can then broadcast protocol packets requesting the configuration of a specific device of interest such as a new IP address. Once a device of interest is configured with at least an IP address, the device of interest can communicate using TCP / IP, and it can thereafter be managed using higher level tools and firmware.