WO2010130217A1 - 信息同步方法、装置和系统 - Google Patents

信息同步方法、装置和系统 Download PDF

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Publication number
WO2010130217A1
WO2010130217A1 PCT/CN2010/072724 CN2010072724W WO2010130217A1 WO 2010130217 A1 WO2010130217 A1 WO 2010130217A1 CN 2010072724 W CN2010072724 W CN 2010072724W WO 2010130217 A1 WO2010130217 A1 WO 2010130217A1
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WIPO (PCT)
Prior art keywords
local area
area network
address
network device
private
Prior art date
Application number
PCT/CN2010/072724
Other languages
English (en)
French (fr)
Inventor
吴黄伟
张钦亮
方平
朱萸
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to KR1020117028738A priority Critical patent/KR101323629B1/ko
Priority to JP2012510103A priority patent/JP5344203B2/ja
Priority to EP10774558.0A priority patent/EP2432194B1/en
Publication of WO2010130217A1 publication Critical patent/WO2010130217A1/zh
Priority to US13/295,862 priority patent/US8832314B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803Home automation networks
    • H04L12/283Processing of data at an internetworking point of a home automation network
    • H04L12/2834Switching of information between an external network and a home network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/25Mapping addresses of the same type
    • H04L61/2503Translation of Internet protocol [IP] addresses
    • H04L61/2514Translation of Internet protocol [IP] addresses between local and global IP addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/25Mapping addresses of the same type
    • H04L61/2503Translation of Internet protocol [IP] addresses
    • H04L61/2521Translation architectures other than single NAT servers
    • H04L61/2535Multiple local networks, e.g. resolving potential IP address conflicts
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • H04L67/1095Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes

Definitions

  • the present invention relates to the field of communications, and in particular, to an information synchronization method, apparatus, and system. Background of the invention
  • the UPnP (Universal Plug and Play) protocol enables control of devices in the home network and interworking between devices in the home network.
  • UPnP defines a mechanism for remote access to implement two different inter-network UPnP communications.
  • the remote network accesses devices in the home network.
  • the remote network and the home network control and communicate through the UPnP protocol.
  • the remote network and the home network are both local area networks, and a device in the home network uses the same private IP as the devices in the remote network. Address conflicts can occur when the address is reached. At this time, the two local area networks cannot communicate.
  • Embodiments of the present invention provide an information synchronization method, apparatus, and system, which are solved in two Address conflicts when LANs use the UPnP protocol for communication.
  • An embodiment of the present invention provides an information synchronization method, including: obtaining announcement information of a first local area network device in a first local area network, where the announcement information includes a private address of the first local area network device in a first local area network; Mapping a private address of the first local area network device to a corresponding external address according to a mapping relationship between the private address and the external address, and sending a notification message carrying the external address of the first local area network device to the second local area network, so that The second local area network saves an external address of the first local area network device, and notifies a second local area network device in the second local area network device.
  • An embodiment of the present invention further provides an information synchronization apparatus, including:
  • a private address obtaining module configured to obtain the announcement information of the first local area network device in the first local area network, where the announcement information includes a private address of the first local area network device in the first local area network;
  • An address mapping module configured to map the private address obtained by the private address obtaining module to a corresponding external address according to a mapping relationship between the preset private address and the external address;
  • a synchronization information sending module configured to send, to the second local area network, a notification message that carries the external address mapped by the address mapping module, so that the second local area network saves an external address of the first local area network device, and the The status of a local area network device notifies the second local area network device in the second local area network.
  • An embodiment of the present invention further provides an information synchronization system, including a first information synchronization device and a second information synchronization device; the first information synchronization device and the second information synchronization device are respectively located in the first local area network and the second local area network;
  • the first information synchronization device is configured to obtain announcement information of the first local area network device in the first local area network, where the announcement information includes a private address of the first local area network device in the first local area network, according to a preset private The mapping between the address and the external address, mapping the private address of the first local area network device to the corresponding external address, and sending the notification message carrying the external address of the first local area network device to the second information synchronization device;
  • the second information synchronization device is configured to receive a notification message sent by the first information synchronization device, and store an external address of the first local area network device carried in the notification message, to the second local area network device The second local area network device notifies the status of the first local area network device.
  • the information synchronization method, device and system provided by the embodiment of the present invention can convert the private address of the first local area network device into an external address, and notify the second local area network, so that the second local area network can save the external address of the first local area network device. And notifying the second local area network device of the status of the first local area network device, and achieving the purpose of synchronizing information between the first local area network device and the second local area network device, wherein the technical solution provided by the embodiment of the present invention can The private address is converted into an external address, so that the problem of possible address conflict between the first local area network and the second local area network is solved, thereby achieving the purpose of avoiding address conflict.
  • FIG. 1 is a flowchart of an information synchronization method according to Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart of an information synchronization method according to Embodiment 2 of the present invention.
  • Embodiment 3 is a flowchart of an information synchronization method according to Embodiment 3 of the present invention.
  • Embodiment 4 is a flowchart of an information synchronization method according to Embodiment 4 of the present invention.
  • FIG. 5 is a specific flow chart of step 402 in Figure 4.
  • Figure 6 is a specific flow chart of step 405 in Figure 4.
  • FIG. 7 is a flowchart of an information synchronization method according to Embodiment 5 of the present invention.
  • step 702 in FIG. 7 is a specific flowchart of step 702 in FIG. 7;
  • Figure 9 is a specific flow chart of step 705 in Figure 7;
  • FIG. 10 is a schematic structural diagram of an information synchronization apparatus according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of an information synchronization apparatus according to another embodiment of the present invention
  • FIG. 12 is a mapping relationship establishment module of FIG. Schematic diagram of the structure of 1004
  • FIG. 13 is a schematic structural diagram of the communication module 1005 of FIG. 11;
  • FIG. 14 is an information synchronization system according to an embodiment of the present invention. Mode for carrying out the invention
  • the first embodiment of the present invention provides an information synchronization method.
  • the method includes: Step 101: Acquire a first local area network device Declaring information in the first local area network, where the announcement information includes a private address of the first local area network device in the first local area network;
  • the first local area network device when the status of the first local area network device is changed, for example, the first local area network device is online or offline, the first local area network device sends the announcement information to the first local area network, where the announcement information is used for the first local area network. Declaring the status change of the first local area network device.
  • Step 102 Map a private address of the first local area network device to a corresponding external address according to a mapping relationship between a preset private address and an external address.
  • the external address is an unused address in the first local area network and the second local area network, for example: when the private address used by the first local area network is 192.168.1.0 to 192.168.1.10, and the private address used by the second local area network When the value is 192.168.1.5 to 192.168.1.25, the external address of the first local area network may be set to 192.168.2.0 to 192.168.2.10, or 192.168.1.30 to 192.168.1.40, etc., which is not described herein;
  • the mapping relationship between the address and the external address may be a mapping, or a one-to-many mapping.
  • Step 103 Send a notification message carrying the external address of the first local area network device to the second local area network, so that the second local area network saves the external address of the device, and notifies the status of the first local area network device.
  • the second local area network device in the second local area network is notifies the status of the first local area network device.
  • the information synchronization method provided by the embodiment of the present invention can enable the private area of the first local area network device Converting the address to an external address, and notifying the second local area network, so that the second local area network can save the external address of the first local area network device, and notifying the second local area network device of the status of the first local area network device, and reaching the first local area network device
  • the technical solution provided by the embodiment of the present invention can convert the private address of the first local area network device into an external address, so that an address may exist between the first local area network and the second local area network. The problem of conflict, thus achieving the purpose of avoiding address conflicts.
  • the embodiment of the invention provides an information synchronization method, which solves the problem of address conflicts during remote access between local networks.
  • the method is as shown in FIG. 2, and specifically includes the following:
  • Step 201 The state of the first local area network device in the first local area network changes, and the first local area network device sends an announcement message.
  • the two local area networks of the communication peers establish a connection and communicate through the UPnP protocol
  • the state of the first local area network device in the first local area network changes, such as the device is online or the device is offline
  • the first local area network device is in the first
  • An announcement message is sent in a local area network, and the announcement message may be ssdp:alive (used to announce that the device is online).
  • the ssdp:alive message carries a first local area network containing a URL (Universal Resource Locator), and the URL includes a private address of the first local area network device.
  • URL Universal Resource Locator
  • the device If the device is online, you need to add the device's address to the local device list on the first LAN. If the device is offline, you need to delete the device's address from the local device list on the first LAN.
  • Step 202 The remote access module of the first local area network acquires a private address of the first local area network device.
  • Step 203 The remote access module of the first local area network acquires an external address corresponding to the private address of the first local area network device according to the mapping relationship between the private address and the external address set in advance;
  • Step 204 The remote access module of the first local area network Sending a new URL of the first local area network device to the second local area network;
  • the remote access module of the first local area network replaces the address in the URL of the first local area network device with the private address, and notifies the first local area network device information to the second local area network, the first local area network
  • the device information includes an identifier of the first local area network device and an external address of the first local area network device.
  • the address of the first local area network device is the external address mapped in step 203, and when the second local area network receives the message with the external address of the first local area network as the source address, When the packet is sent from the first local area network device, when the second local area network sends a message to the first local area network device, the external address of the first local area network device is also used as the destination address.
  • the information synchronization method provided by the embodiment of the present invention can convert the private address of the first local area network device into an external address, and notify the second local area network, so that the second local area network can save the external address of the first local area network device, and The state of the first local area network device is notified to the second local area network device, and the information synchronization between the first local area network device and the second local area network device is achieved.
  • the technical solution provided by the embodiment of the present invention can enable the private address of the first local area network device. The problem is that the address conflict may exist between the first local area network and the second local area network, so that the address conflict is avoided.
  • the third embodiment of the present invention provides An information synchronization method, which is used to synchronize address information when establishing a remote connection between two local area networks, thereby realizing address conflict Normal communication, as shown in FIG. 3, the information synchronization method includes the following steps:
  • Step 301 The first local area network acquires a private address of the first local area network device.
  • the remote access module (such as RAS, RAC) of the first local area network acquires the private address of the first local area network device.
  • the remote address of the first local area network may be configured by the remote access module of the first local area network when the remote access is established.
  • the configuration process can be implemented by adding an action in the remote access module of the first local area network, the action is used to configure the private address of the first local area network device, for example: adding the action SetLocalNetAddress ( ), the parameters of the action: ⁇ Table 1 Shown.
  • the subnet address is the network segment of the first local area network.
  • the configuration of the foregoing action determines that the remote access module of the first local area network determines the network segment used by the first local area network, that is, the remote access module of the first local area network.
  • the range of private addresses used by the first local area network is determined. According to the actual situation, a LAN can have multiple subnet addresses. In this case, just add several sets of NetAddress and Mask parameters in the SetLocalNetAddress ( ) action.
  • the first LAN device can be assigned a private address through the DHCP SERVER on the gateway. Therefore, the remote access module of the first local area network can also obtain the private address information of the first local area network device directly from the gateway of the first local area network.
  • the remote access module of the first local area network may select the subnet address of the first local area network or the private address of each of the first local area network devices, which is not limited in this embodiment of the present invention.
  • Step 302 The first local area network and the second local area network negotiate a private address mapping relationship. After the first local area network and the second local area network establish a remote access connection, the first local area network sends the private address of the first local area network to the second local area network, for example, Second LAN remote access mode.
  • the negotiationatieAddressO action is added to the block, and the first local area network negotiates a private address mapping relationship with the second local area network by calling the action.
  • the parameters of the action are shown in Table 2:
  • Table 2 carries the subnet address currently used by the first local area network.
  • Table 2 can also carry the private address of each first local area network device in the first local area network.
  • the NetAddree parameter in the Negotiatie AddressO action can be modified to carry the private address.
  • Step 303 The second local area network sends a response message to the first local area network.
  • the remote access module of the second local area network After receiving the private address information of the first local area network, the remote access module of the second local area network determines the combined with the private address of the second local area network. The second local area network determines whether the address information carried in the Negotiatie AddressO action conflicts with the address of the second local area network device. If there is a conflict, a response is returned to the first local area network, indicating that the address conflicts, and step 304 is performed; otherwise, a response is returned to the first local area network, indicating that the address is not conflicting.
  • Step 304 The first local area network allocates an external address to the conflicting private address.
  • the subnet address is used, a unified external address is assigned to the conflicting subnet address.
  • the external address is also a network segment and is not used by the first local area network.
  • the conflicting subnet address is 192.168.3.0.
  • the subnet mask is 255.255.255.0
  • the external address assigned to the subnet address can be 192.168.4.0 and the subnet mask is 255.255.255.0.
  • an external address is assigned to the conflicting device address, and the external address is not used by the first local area network.
  • the private address of the first local area network device is 192.168.1.7.
  • the code is 255.255.255.0, 192.168.10.7 can be used as the external address of the device.
  • Step 305 The first local area network establishes a mapping relationship between the private address and the external address. If the response of the second local area network indicates that there is no address conflict in step 303, and the first local area network has assigned the external address to the private address through step 304, A mapping relationship is established between the private address and the external address.
  • mapping relationship is established between the device address and the external address, and the relationship is stored in the remote access module in the form of a conversion entry, as shown in Table 4.
  • Steps 302 through 305 require repeated operations until all conflicting private addresses are assigned corresponding external addresses.
  • the foregoing information synchronization process is described by taking the first local area network as an example.
  • the second local area network also needs to perform the conversion of the private address, and the process is basically the same as the foregoing process, and details are not described herein.
  • the first local area network device updates the address mapping rule, and the specific steps are as follows:
  • Step 306 The first local area network acquires a private address in the second local area network.
  • the first local area network first needs to obtain the address space of the second local area network, that is, The private address that has been used and will be used in the second local area network, so that the remote access module of the first local area network can determine whether the private address of the first local area network device conflicts with the address in the second local area network.
  • Step 307 Determine whether the private address of the first local area network device of the state change in the first local area network conflicts with the address in the second local area network;
  • Step 308 If the private address of the first local area network device whose status changes is in conflict with the private address in the second local area network, assign the external address to the status changing device.
  • the first local area network needs to allocate an external address to the first local area network device whose status is changed, and communicate with the second local area network through the external address later.
  • the external address is a private address that is not used by the first local area network and the second local area network.
  • there are many methods for allocating an external address and the network segment of the private address can be replaced to obtain an external address.
  • the private address of the first LAN device is 192.168.1.3
  • 192.168.10.0 is the subnet segment that is not used by the first LAN and the second LAN
  • Step 309 Establish a mapping relationship between the private address of the first local area network device that is changed in the state and the external address.
  • Step 309 associate the state-changed first local area network device private address with the external address obtained by the device in step 308, establish a mapping relationship, and store the mapping relationship in the remote access module of the first local area network.
  • the external address corresponding to the private address of the first local area network device of the state change may be obtained.
  • the information synchronization method provided by the embodiment of the present invention converts the conflicting private address into an external address by negotiating the mapping relationship of the private address after the two local area networks are connected in the form of remote access, and notifies the external address.
  • the local area network realizes the purpose of using the converted external address for communication, and solves the problem of address conflict.
  • the device can communicate with the local area network through the external address.
  • the fourth embodiment of the present invention provides an information synchronization method, which implements an address when remotely accessed.
  • the communication of the devices in the two conflicting LANs, as shown in FIG. 4, the method includes the following steps:
  • Step 401 The remote access module of the first local area network receives the message sent by the first local area network to the second local area network.
  • the first local area network device when the first local area network device sends a message to the second local area network, the message first arrives at the remote access module of the first local area network, and the address is converted by the access module of the first local area network.
  • the source device (the first local area network device) that sends the packet is located in the first local area network, and the device (the second local area network device) that receives the message is located in the second local area network; the source address of the packet is the source device in the first local area network.
  • the private address in the packet, the destination address of the packet is the address of the destination device stored in the first local area network. If the destination device has a corresponding external address, the destination address is an external address of the destination device, and otherwise is a private address of the destination device.
  • Step 402 Perform remote address conversion on the remote access module of the first local area network.
  • Step 4021 The remote access module of the first local area network extracts a source address of the packet.
  • the remote access module of the first local area network After receiving the packet, the remote access module of the first local area network extracts the source address of the packet.
  • the source address of the packet is the private address of the source device that sends the packet.
  • Step 4022 The remote access module of the first local area network determines whether the source address needs to be converted.
  • the private address obtained in step 4021 is used to determine whether there is a translation entry corresponding to the private address. If not, the packet is directly forwarded to the second local area network. If yes, the source address needs to be performed. Conversion.
  • Step 4023 The remote access module of the first local area network converts the private address into an external address. If the result of the determination in step 4022 is that conversion is required, in this step, according to step 4021 The obtained private address is used to search for a translation entry stored in the remote access module of the first local area network, and obtain an external address corresponding to the private address.
  • Step 403 The remote access module of the first local area network forwards the packet to the second local area network.
  • the remote access module of the first local area network uses the external address corresponding to the source address of the packet obtained in step 402 as the packet.
  • the new source address forwards the message to the second local area network.
  • Step 404 The remote access module of the second local area network receives the message.
  • the remote access module of the second local area network receives the message sent by the first local area network.
  • Step 405 The remote access module of the second local area network performs address translation.
  • Step 4051 The remote access module of the second local area network extracts the destination address of the packet.
  • Step 4052 The remote access module of the second local area network determines whether the destination address is an external address.
  • the remote access module of the second local area network searches for the conversion entry stored in the remote access module of the second local area network according to the destination address extracted in step 5051. If the corresponding conversion entry exists, the destination address is the external destination device. address.
  • Step 4053 The remote access module of the second local area network converts the external address into a private address of the second local area network.
  • Step 406 The remote access module of the second local area network forwards the packet to the destination device.
  • the remote access module of the second local area network uses the private address of the destination device as the new destination address of the packet.
  • the second local area network forwards the message.
  • Step 401 to step 406 are the process of sending a message to the second local area network by the first local area network, and the process of sending the message by the second local area network to the first local area network is substantially the same as the foregoing process, and is not described herein.
  • An information synchronization method provided by an embodiment of the present invention is remotely accessed in two local area networks
  • the external address is communicated through the device.
  • the source address of the packet is translated from the private address to the external address, and the external address is used as the new source address.
  • the destination address of the packet is translated from the external address to the private address, and the packet is sent to the receiver according to the private address.
  • the original private address of the device does not need to be changed, but the address is converted to complete the communication. A problem that cannot be communicated when an address conflicts.
  • the synchronization method can implement the conversion of the address information.
  • the method is as shown in FIG. 7, and includes:
  • Step 701 The remote access module of the first local area network receives the message sent by the first local area network to the second local area network.
  • the message when the first local area network device sends a message to the second local area network, the message first arrives at the remote access module of the first local area network, and is performed by the remote access module of the first local area network. Address translation.
  • the source device (the first local area network device) that sends the packet is located in the first local area network
  • the destination device (the second local area network device) that receives the packet is located in the second local area network
  • the source address of the packet is the source device.
  • the application layer of the >3 ⁇ 4 text carries the address information, where the address information includes a private address in the first local area network, for example, the content of the message carries a URL (Uniform Resource Locator), The URL carries the private address of the first LAN device.
  • the address information includes a private address in the first local area network
  • the content of the message carries a URL (Uniform Resource Locator)
  • the URL carries the private address of the first LAN device.
  • Step 702 The remote access module of the first local area network performs address translation.
  • the source address of the packet that is, the private address of the source device
  • the private address in the first local area network included in the address information needs to be converted.
  • the specific steps of the conversion of the source address refer to step 402 in the fourth embodiment of the present invention. The following describes the step of converting the private address in the first local area network included in the address information.
  • step 7021 the remote access module of the first local area network acquires address information in the application layer
  • the content of the packet needs to be analyzed, and the address information is extracted from the content of the packet.
  • the content of the packet carries a URL (Uniform Resource Locator), and the URL carries a private address in the first local area network. Then, this step needs to obtain the private address carried in the URL.
  • URL Uniform Resource Locator
  • Step 7022 The remote access module of the first local area network converts address information in the application layer.
  • the remote access module of the first local area network searches for the conversion entry according to the private address obtained in step 7021; and maps the private address to the corresponding external address according to the conversion entry.
  • Step 7023 The remote access module of the first local area network updates the address information in the application layer; the remote access module of the first local area network replaces the private address with the converted external address, and updates the address information in the application layer.
  • the address information in the application layer may include multiple private addresses in the first local area network, and each private address may also appear in multiple locations in the application layer, and all the private addresses need to be replaced with Corresponding external address.
  • Step 703 The remote access module of the first local area network forwards the message to the second local area network.
  • the external address corresponding to the source address is used as the new source address of the message.
  • the message is forwarded to the second local area network.
  • Step 704 The remote access module of the second local area network receives the packet.
  • the remote access module of the second local area network receives the message sent by the first local area network.
  • Step 705 The remote access module of the second local area network performs address translation.
  • Step 405. The process of converting the address information carried by the packet application layer is described below with reference to the accompanying drawings. The process is shown in Figure 9, which includes:
  • Step 7051 The remote access module of the second local area network obtains the address information in the application layer.
  • the content of the packet needs to be analyzed, and the address information is extracted from the content of the packet.
  • the content of the packet carries a URL (unified The resource locator, the URL has an external address of the device in the second local area network, and the external address of the device in the second local area network carried in the URL is obtained in this step.
  • Step 7052 The remote access module of the second local area network converts the address information in the application layer.
  • the conversion entry is searched according to the external address obtained in step 7051; and the external address is mapped to the corresponding private address according to the conversion entry.
  • Step 7053 The remote access module of the second local area network updates the address information in the application layer.
  • the external address is replaced by the translated private address, and the address information in the application layer is updated.
  • the address information in the application layer may include external addresses of multiple devices in the second local area network, and the external addresses of each device may also appear in multiple locations in the application layer, and the external addresses need to be used. Replace all with the corresponding private address.
  • Step 706 The remote access module of the second local area network forwards the packet to the destination device.
  • the remote access module of the second local area network uses the private address of the destination device as the new destination address of the packet.
  • the second local area network forwards the message.
  • the information synchronization method when the two local area networks are connected in the form of remote access, communicates with the external address passed between the devices, and when the message is sent, the source address of the four texts is private.
  • the address is translated to the external address, and the external address is used as the new source address to send the message; when the packet is received, the destination address of the packet is converted from the external address to the private address, and the packet is sent according to the private address.
  • the receiver does not need to change the original private address of the device, but only converts the address to complete the communication, and solves the problem that the communication cannot be communicated when the address conflicts. question.
  • the address information carried by the packet application layer needs to be converted, which solves the problem that the UPnP protocol cannot work normally when the address conflicts.
  • an embodiment of the present invention further provides an information synchronization apparatus, including: a private address obtaining module 1001, configured to acquire announcement information of a first local area network device in a first local area network, and the announcement information Included in the private address of the first local area network device in the first local area network;
  • the address mapping module 1002 is configured to map the private address of the first local area network device acquired by the private address obtaining block 1001 to a corresponding external address according to a mapping relationship between the preset private address and the external address;
  • the synchronization information sending module 1003 is configured to send, to the second local area network, a notification message that carries the external address mapped by the address mapping module 1002, so that the second local area network saves the external address of the first local area network device, and The status of the first local area network device is notified to the second local area network device in the second local area network.
  • the information synchronization device is as shown in FIG. 11, and further includes:
  • the mapping relationship update module 1004 is configured to update a mapping relationship between the private address and the external address, so that the address mapping module 1002 can map the private address of the first local area network device to the original address according to the mapping relationship between the updated private address and the external address.
  • External address and / or,
  • the communication module 1005 is configured to communicate with the second local area network by using the address of the first local area network device mapped by the address mapping module 1002.
  • the mapping relationship update module 1004 may include: a peer information obtaining unit 10041, configured to acquire a private address in the second local area network; and an address allocating unit 10042, configured to use, according to the pair When the private address in the second local area network acquired by the terminal information acquiring unit 10041 determines that the private address of the first local area network device conflicts with the private address in the second local area network, the first local area network device is allocated an external address.
  • the external address is a private address that is not used by the first local area network and the second local area network;
  • mapping relationship establishing unit 10043 configured to: at the first local area network device private address and the A mapping relationship is established between the external addresses allocated by the address allocation unit 10042.
  • the communication module 1005 may include:
  • the information sending unit 10051 is configured to receive the packet sent by the first local area network device to the second local area network, and obtain the private address of the first local area network device according to the mapping between the private address of the first local area network device and the external address.
  • the external address is used as a new source address of the packet, and the packet is sent to the second local area network; and/or,
  • the information receiving unit 10052 is configured to receive a packet sent by the second local area network to the first local area network device, and obtain a private address of the first local area network device according to a mapping relationship between a private address of the first local area network device and an external address. And sending the packet to the first local area network by using the private address as a new destination address of the text.
  • the information sending unit 10051 may further include: a first replacement subunit, configured to replace the private address of the first local area network device included in the packet application layer sent by the information sending unit 10051 with the corresponding external address ;
  • the information receiving unit 10052 may further include: a second replacement subunit, configured to replace the external address of the first local area network device included in the message application layer received by the information receiving unit 10052 with a corresponding private address.
  • the information synchronization device provided by the embodiment of the present invention can convert the private address of the first local area network device into an external address, and notify the second local area network, so that the second local area network can save the external address of the first local area network device, and The state of the first local area network device is notified to the second local area network device, and the information synchronization between the first local area network device and the second local area network device is achieved.
  • the technical solution provided by the embodiment of the present invention can convert the private address of the first local area network device into The external address, so the problem of possible address conflict between the first local area network and the second local area network is solved, thereby achieving the purpose of avoiding address conflict.
  • an embodiment of the present invention further provides an information synchronization system including a first information synchronization device 1401 and a second information synchronization device 1402; the first information synchronization device 1401 and the second information synchronization device 1402. Located in the first local area network and the second local area network;
  • the first information synchronization device 1401 is configured to obtain announcement information of the first local area network device in the first local area network, where the announcement information includes a private address of the first local area network device in the first local area network, according to a preset The mapping between the private address and the external address, mapping the private address of the first local area network device to the corresponding external address, and sending the notification message carrying the external address of the first local area network device to the second information synchronization device 1402;
  • the second information synchronization device 1402 is configured to receive a notification message sent by the first information synchronization device 1401, store an external address of the first local area network device carried in the notification message, and send the second local area network device to the second local area network.
  • the second local area network device notifies the status of the first local area network device.
  • the first information synchronization device can convert the private address of the first local area network device into an external address, and notify the second information synchronization device of the second local area network, so that the second information synchronization device can save the The external address of the first local area network device is notified, and the state of the first local area network device is notified to the second local area network device, and the information synchronization between the first local area network device and the second local area network device is achieved, which is provided by the embodiment of the present invention.
  • the technical solution can convert the private address of the first local area network device into an external address, so that the problem of possible address conflict between the first local area network and the second local area network is solved, thereby achieving the purpose of avoiding address conflict.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated module can also be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a standalone product. Quality.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the above described embodiments of the present invention are further described in detail, and the embodiments of the present invention are intended to be illustrative only. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

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Description

信息同步方法、 装置和系统
本申请要求于 2009 年 05 月 14 日提交中国专利局、 申请号为 200910138884.6、发明名称为"信息同步方法、 装置和系统"的中国专利申请 的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域, 特别涉及一种信息同步方法、 装置和系统。 发明背景
伴随着消费电子产品普遍数字化的趋势, 家庭中正出现越来越多数字 化的娱乐设备和家电产品, 将这些家庭网络设备以有线或无线方式连接成 家庭网络, 以实现内容共享或相互控制等功能, 是业界正在构想并努力实 现的数字家庭网络概念。
UPnP ( Universal Plug and Play, 通用即插即用)协议能够实现对家庭 网络中设备的控制, 以及家庭网络中设备之间的互通。 UPnP定义了远程访 问的机制, 以实现两个不同的网络间 UPnP通信。 例如, 远程网络对家庭网 络中的设备访问, 在 UPnP 的远程访问机制中, 远程网络和家庭网络通过 UPnP协议进行控制和通信。
在实现本发明过程中,发明人发现在上述使用 UPnP协议由远程网络访 问家庭网络时存在如下问题:
当使用 UPnP协议进行通信的两个局域网络中设备的私有地址发生冲 突时, 例如远程网络和家庭网络均为局域网络, 且家庭网络中的某一设备 与远程网络中的设备使用相同的私有 IP地址时,就会造成地址冲突。这时, 所述两个局域网络无法进行通信。 发明内容
本发明的实施例提供了一种信息同步方法、 装置和系统, 解决了在两 个局域网使用 UPnP协议进行通信时地址冲突的问题。
本发明的实施例提供了一种信息同步方法, 包括: 获取第一局域网设 备在第一局域网中的宣告信息, 所述宣告信息中包含所述第一局域网设备 在第一局域网中的私有地址; 根据预先设置的私有地址与对外地址的映射 关系, 将所述第一局域网设备的私有地址映射为对应的对外地址; 向第二 局域网发送携带所述第一局域网设备对外地址的通知消息, 以使得所述第 二局域网保存所述第一局域网设备的对外地址, 并将所述第一局域网设备 的状态通知所述第二局域网中的第二局域网设备。
本发明的实施例还提供了一种信息同步装置, 包括:
私有地址获取模块, 用于获取第一局域网设备在第一局域网中的宣告 信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中的私有地 址;
地址映射模块, 用于根据预先设置的私有地址与对外地址的映射关系, 将所述私有地址获取模块获取的私有地址映射为对应的对外地址;
同步信息发送模块, 用于向第二局域网发送携带所述地址映射模块映 射得到的对外地址的通知消息, 以使得所述第二局域网保存所述第一局域 网设备的对外地址, 并将所述第一局域网设备的状态通知所述第二局域网 中的第二局域网设备。
本发明的实施例还提供了一种信息同步系统, 包括第一信息同步装置 和第二信息同步装置; 所述第一信息同步装置和第二信息同步装置分别位 于第一局域网和第二局域网;
所述第一信息同步装置, 用于获取第一局域网设备在第一局域网中的 宣告信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中的私 有地址, 根据预先设置的私有地址与对外地址的映射关系, 将所述第一局 域网设备的私有地址映射为对应的对外地址, 向所述第二信息同步装置发 送携带所述第一局域网设备对外地址的通知消息; 所述第二信息同步装置, 用于接收所述第一信息同步装置发送的通知 消息, 存储所述通知消息中携带的所述第一局域网设备的对外地址, 向所 述第二局域网中的第二局域网设备通知所述第一局域网设备的状态。
本发明实施例提供的信息同步方法、 装置和系统, 能够将第一局域网 设备的私有地址转换成对外地址, 并通知第二局域网, 使得第二局域网能 够保存所述第一局域网设备的对外地址, 并将所述第一局域网设备的状态 通知第二局域网设备, 达到了第一局域网设备和第二局域网设备之间信息 同步的目的, 由于本发明实施例提供的技术方案能够将第一局域网设备的 私有地址转换成对外地址, 所以解决了第一局域网和第二局域网之间可能 存在地址冲突的问题, 从而达到避免地址冲突的目的。 附图简要说明
此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一 部分, 并不构成对本发明的限定。 在附图中:
图 1为本发明实施例一提供的一种信息同步方法的流程图;
图 2为本发明实施例二提供的一种信息同步方法的流程图;
图 3为本发明实施例三提供的一种信息同步方法的流程图;
图 4为本发明实施例四提供的一种信息同步方法的流程图;
图 5为图 4中步骤 402的具体流程图;
图 6为图 4中步骤 405的具体流程图;
图 7为本发明实施例五提供的一种信息同步方法的流程图;
图 8为图 7中步骤 702的具体流程图;
图 9为图 7中步骤 705的具体流程图;
图 10为本发明的实施例提供的一种信息同步装置的结构示意图; 图 11为本发明的又一实施例提供的一种信息同步装置的结构示意图; 图 12为图 11中映射关系建立模块 1004的结构示意图; 图 13为图 11中通信模块 1005的结构示意图;
图 14为本发明的实施例提供的一种信息同步系统。 实施本发明的方式
为使本发明的目的、 技术方案和优点更加清楚明白, 下面结合实施方 式和附图, 对本发明做进一步详细说明。 在此, 本发明的示意性实施方式 及其说明用于解释本发明, 但并不作为对本发明的限定。
为了解决在两个局域网使用 UPnP协议的进行通讯时地址冲突的问题, 本发明实施例一提供了一种信息同步方法, 该方法如图 1所示, 包括: 步骤 101、获取第一局域网设备在第一局域网中的宣告信息, 所述宣告 信息中包含所述第一局域网设备在第一局域网中的私有地址;
在本实施例中, 当第一局域网设备状态变更时, 如第一局域网设备上 线或者下线, 所述第一局域网设备会向第一局域网发送宣告信息, 所述宣 告信息用于向第一局域网宣告所述第一局域网设备的状态变更情况。
步骤 102、根据预先设置的私有地址与对外地址的映射关系,将所述第 一局域网设备的私有地址映射为对应的对外地址;
在本实施例中, 所述对外地址为第一局域网和第二局域网中未使用的 地址, 例如: 当第一局域网使用的私有地址为 192.168.1.0至 192.168.1.10, 第二局域网使用的私有地址为 192.168.1.5至 192.168.1.25时, 可以将所述 第一局域网的对外地址设置为 192.168.2.0至 192.168.2.10,或者 192.168.1.30 至 192.168.1.40等, 此处不作——赘述; 所述私有地址与所述对外地址的映 射关系可以为——映射, 也可以为一对多的映射。
步骤 103、向第二局域网发送携带所述第一局域网设备对外地址的通知 消息, 以使得所述第二局域网保存所述设备的对外地址, 并将所述第一局 域网设备的状态通知所述第二局域网中的第二局域网设备。
本发明实施例提供的信息同步方法, 能够将第一局域网设备的私有地 址转换成对外地址, 并通知第二局域网, 使得第二局域网能够保存所述第 一局域网设备的对外地址, 并将所述第一局域网设备的状态通知第二局域 网设备, 达到了第一局域网设备和第二局域网设备之间信息同步的目的, 由于本发明实施例提供的技术方案能够将第一局域网设备的私有地址转换 成对外地址, 所以解决了第一局域网和第二局域网之间可能存在地址冲突 的问题, 从而达到避免地址冲突的目的。
下面结合附图, 对本发明实施例二进行介绍。
本发明实施例提供了一种信息同步方法, 解决了局域网间进行远程访 问时地址冲突的问题, 该方法如图 2所示, 具体包括如下:
步骤 201、第一局域网下的第一局域网设备状态改变, 第一局域网设备 发出宣告消息;
在互为通信对端的两个局域网建立连接, 并通过 UPnP协议进行通信 后, 第一局域网下的第一局域网设备状态改变时, 如设备上线或设备下线, 所述第一局域网设备会在第一局域网内发送宣告消息, 所述宣告消息可以 是 ssdp:alive (用于宣告设备上线)。 所述 ssdp:alive消息中携带有包含 URL ( Universal Resource Locator, 通用资源定位符) 的第一局域网设 ^言息, 所述 URL中包含所述第一局域网设备的私有地址。
如果是设备上线, 则需要将该设备的地址加入到第一局域网的本地设 备列表中; 如果是设备下线, 则需要将该设备的地址由第一局域网的本地 设备列表中删除。
步骤 202、第一局域网的远程访问模块获取所述第一局域网设备的私有 地址;
第一局域网的远程访问模块在得知所述第一局域网设备状态变化后, 获取所述第一局域网设备的私有地址, 具体为从所述第一局域网设备发送 的信息中获取 URL,并从所述获得的 URL中提取所述第一局域网设备在第 一局域网下的私有地址。 步骤 203、第一局域网的远程访问模块根据预先设置的私有地址与对外 地址的映射关系, 获取所述第一局域网设备的私有地址对应的对外地址; 步骤 204、 第一局域网的远程访问模块将所述第一局域网设备的新的 URL发送给第二局域网;
本步骤中, 第一局域网的远程访问模块将所述第一局域网设备的 URL 中的地址由私有地址替换为对外地址, 并将所述第一局域网设备信息通知 第二局域网, 所述第一局域网设备信息包括所述第一局域网设备的标识及 所述第一局域网设备的对外地址。
对于第二局域网来说, 所述第一局域网设备的地址即为步骤 203 中映 射得到的对外地址, 第二局域网接收到以所述第一局域网的对外地址为源 地址的报文时, 就会知道该报文来自所述第一局域网设备, 第二局域网向 所述第一局域网设备发送报文时, 也会以所述第一局域网设备的对外地址 为目的地址。
第二局域网下的第二局域网设备信息同步到第一局域网的操作过程与 上述过程相似, 在此不再赘述。
本发明实施例提供的一种信息同步方法, 能够将第一局域网设备的私 有地址转换成对外地址, 并通知第二局域网, 使得第二局域网能够保存所 述第一局域网设备的对外地址, 并将所述第一局域网设备的状态通知第二 局域网设备, 达到了第一局域网设备和第二局域网设备之间信息同步的目 的, 由于本发明实施例提供的技术方案能够将第一局域网设备的私有地址 转换成对外地址, 所以解决了第一局域网和第二局域网之间可能存在地址 冲突的问题, 从而达到避免地址冲突的目的。
对于刚刚建立起远程连接的两个局域网,如果他们通过 UPnP协议进行 通信, 但两个局域网之间存在地址冲突, 则会造成无法正常工作的问题, 为了解决这一问题, 本发明实施例三提供了一种信息同步方法, 使用该方 法在两个局域网建立远程连接时同步地址信息, 就能够实现在地址冲突情 况下的正常通信, 如图 3所示, 该信息同步方法包括如下步骤:
步骤 301、 第一局域网获取第一局域网设备的私有地址;
在第一局域网与第二局域网建立远程连接后, 第一局域网的远程访问 模块(如 RAS, RAC )获取第一局域网设备的私有地址。
本发明实施例中, 可以由第一局域网的远程访问模块在远程访问建立 时, 配置第一局域网的私有地址。
配置过程可以通过在所述第一局域网的远程访问模块中添加一个动作 来实现, 该动作用来配置第一局域网设备的私有地址, 例如: 增加动作 SetLocalNetAddress ( ), 该动作的参数:^表 1所示。
其中, 子网地址为所述第一局域网的网段, 通过上述动作的配置, 第 一局域网的远程访问模块就确定了第一局域网使用的网段, 也就是说, 第 一局域网的远程访问模块就确定了第一局域网使用的私有地址的范围。 根 据实际情况的需要, 一个局域网可以有多个子网地址, 这时, 只要在 SetLocalNetAddress ( )动作中增加几组 NetAddress和 Mask参数即可。
Figure imgf000009_0001
表 1
在第一局域网中, 可以通过网关上的 DHCP SERVER为第一局域网设 备分配私有地址, 因此第一局域网的远程访问模块也可以直接从第一局域 网的网关上获取第一局域网设备的私有地址信息。 根据需要, 第一局域网 的远程访问模块可以选择获取第一局域网的子网地址, 或者每个第一局域 网设备的私有地址, 本发明实施例对此不作限定。
步骤 302、 第一局域网与第二局域网协商私有地址映射关系; 在第一局域网和第二局域网建立远程访问连接后, 第一局域网会向第 二局域网发送第一局域网的私有地址, 例如, 在第二局域网的远程访问模 块中增加 NegotiatieAddressO动作, 第一局域网通过调用该动作与第二局域 网协商私有地址映射关系, 该动作的参数见表 2:
Figure imgf000010_0001
表 2
表 2携带的是第一局域网当前使用的子网地址。
表 2也可以携带第一局域网中各个第一局域网设备的私有地址, 此时, 只要将 NegotiatieAddressO动作中的 NetAddree参数修改为携带私有地址即 可。
步骤 303、 第二局域网向第一局域网发送响应报文;
第二局域网的远程访问模块在接收到第一局域网的私有地址信息后, 结合第二局域网的私有地址进行判断。 第二局域网判断 NegotiatieAddressO动作中携带的地址信息与第二局域 网设备的地址是否冲突。 如果冲突, 则向第一局域网返回响应, 指示地址 有冲突, 则执行步骤 304; 否则, 向第一局域网返回响应, 指示地址没有冲 突。
步骤 304、 第一局域网为冲突的私有地址分配对外地址;
如果使用的是子网地址, 则为冲突的子网地址分配一个统一的对外地 址, 该对外地址也是一个网段, 且不被第一局域网使用, 例如, 发生冲突 的子网地址为 192.168.3.0, 子网掩码为 255.255.255.0, 则为该子网地址分 配的对外地址可以为 192.168.4.0, 子网掩码为 255.255.255.0。
如果使用的是设备地址, 则为冲突的设备地址分配一个对外地址, 且 该对外地址不被第一局域网使用,例如, 当发生冲突的第一局域网设备的私 有地址为 192.168.1.7, 子网掩码为 255.255.255.0时, 可将 192.168.10.7作 为该设备的对外地址。
然后重复步骤 302和步骤 304,用新分配的对外地址与第二局域网协商 是否存在地址冲突, 直至协商到没有地址冲突。 步骤 305、 第一局域网为私有地址与对外地址建立映射关系; 如果步骤 303 中, 第二局域网的响应中指示不存在地址冲突, 并且第 一局域网已通过步骤 304为私有地址分配了对外地址, 则在该私有地址和 对外地址之间建立映射关系。
如果使用的是子网地址, 则在子网地址和该子网地址的对外地址之间 建立映射关系, 并以转换表项的形式存在第一局域网的远程访问模块中, 所述转换表项如表 3所示:
Figure imgf000011_0001
表 3
如果使用的是设备地址, 则在设备地址与所述对外地址之间建立映射 关系, 并将这种关系以转换表项的形式存储在远程访问模块中, 如表 4所
Figure imgf000011_0002
表 4
步骤 302至步骤 305需要重复操作, 直到全部冲突的私有地址都分配 了相应的对外地址为止。
需要说明的是, 上述信息同步过程以第一局域网为例进行说明, 在实 际操作过程中, 第二局域网也需要进行私有地址的转换, 其过程与上述过 程基本一致, 不再赘述。
当第一局域网中的第一局域网设备状态发生变化时, 需要判断所述状 态改变的第一局域网设备的私有地址是否与第二局域网中的私有地址冲 突, 并在冲突时为所述状态改变的第一局域网设备更新地址映射规则, 具 体步骤如下:
步骤 306、 第一局域网获取所述第二局域网中的私有地址;
本步骤中, 第一局域网首先需要获取所述第二局域网的地址空间, 即 第二局域网中已使用和将要使用的私有地址, 这样, 第一局域网的远程访 问模块就能够判断第一局域网设备的私有地址是否与所述第二局域网中的 地址相冲突。
步骤 307、判断所述状态改变的第一局域网设备在第一局域网中的私有 地址是否与所述第二局域网中的地址相冲突;
步骤 308、如果所述状态改变的第一局域网设备的私有地址与所述第二 局域网中的私有地址冲突, 则为所述状态改变设备分配对外地址;
在本步骤中, 第一局域网需要为所述状态改变的第一局域网设备分配 一个对外地址, 并在以后通过所述对外地址与第二局域网进行通信。
所述对外地址为所述第一局域网和所述第二局域网未使用的私有地 址, 在这一原则下, 分配对外地址的方法有 ^艮多, 可以更换私有地址的网 段进而得到对外地址, 例如: 当第一局域网设备的私有地址为 192.168.1.3, 而 192.168.10.0为第一局域网和第二局域网均未使用的子网网段时,可以将 192.168.1.3转换为 192.168.10.3。 本领域技术人员显然知道, 能够实现地址 转换的手段还有很多, 在此不再——赘述。
步骤 309、在所述状态改变的第一局域网设备私有地址与所述对外地址 之间建立映射关系;
步骤 309将所述状态改变的第一局域网设备私有地址与该设备在步骤 308分配获得的对外地址进行关联, 建立映射关系, 并将该映射关系存储在 第一局域网的远程访问模块中。
才艮据步骤 306至步骤 309建立的映射关系, 可以获取所述状态改变的 第一局域网设备私有地址对应的对外地址。
本发明实施例提供的一种信息同步方法, 在两个局域网络以远程访问 的形式连接后, 通过协商私有地址的映射关系, 将有冲突的私有地址转化 为对外地址, 并将对外地址通知对端局域网, 实现了使用转换后的对外地 址进行通信的目的, 解决了地址冲突的问题。 为存在地址冲突的私有地址分配好对外地址后, 设备就可以通过所述 对外地址与对端的局域网进行通信, 本发明实施例四提供了一种信息同步 方法, 实现了在远程访问时, 存在地址冲突的两个局域网内设备的通信, 如图 4所示, 该方法包括如下步骤:
步骤 401、第一局域网的远程访问模块接收第一局域网向第二局域网发 送的报文;
对于第一局域网来说, 当其下的第一局域网设备向第二局域网发送报 文时, 报文会先到达第一局域网的远程访问模块, 由第一局域网的访问模 块进行地址转换。
发送所述报文的源设备(第一局域网设备)位于第一局域网, 接收所 述报文目的设备(第二局域网设备)位于第二局域网; 该报文的源地址为 源设备在第一局域网中的私有地址, 该报文的目的地址为目的设备在第一 局域网中存储的地址。 如果所述目的设备有对应的对外地址, 则所述目的 地址为该目的设备的对外地址, 否则为该目的设备的私有地址。
步骤 402、 第一局域网的远程访问模块进行地址转换;
具体步骤如图 5所示, 包括:
步骤 4021、 第一局域网的远程访问模块提取报文的源地址;
第一局域网的远程访问模块在接收到报文后, 会提取该报文的源地址, 此时, 该报文的源地址为发送报文的源设备的私有地址。
步骤 4022、 第一局域网的远程访问模块判断是否需要对所述源地址进 行转换;
本步骤中, 根据步骤 4021获取的私有地址去判断是否存在与所述私有 地址对应的转换表项, 如果不存在, 就直接向第二局域网转发该报文, 如 果存在, 则需要对源地址进行转换。
步骤 4023、 第一局域网的远程访问模块将私有地址转换为对外地址。 如果步骤 4022的判断结果为需要进行转换, 本步骤中,根据步骤 4021 获取的私有地址去查找存储在第一局域网的远程访问模块上的转换表项, 获取与该私有地址对应的对外地址。
步骤 403、 第一局域网的远程访问模块向第二局域网转发所述报文; 第一局域网的远程访问模块将步骤 402获取的与所述报文源地址对应 的对外地址, 作为所述报文的新的源地址, 将报文向第二局域网转发。
步骤 404、 第二局域网的远程访问模块接收所述报文;
本步骤中, 第二局域网的远程访问模块接收第一局域网发送的报文。 步骤 405、 第二局域网的远程访问模块进行地址转换;
本步骤具体如图 6所示, 包括:
步骤 4051、 第二局域网的远程访问模块提取所述报文的目的地址; 步骤 4052、 第二局域网的远程访问模块判断所述目的地址是否为对外 地址;
第二局域网的远程访问模块根据步骤 5051提取的目的地址查找存储在 所述第二局域网的远程访问模块上的转换表项, 如果存在对应的转换表项, 则所述目的地址为目的设备的对外地址。
步骤 4053、 第二局域网的远程访问模块将所述对外地址转换为第二局 域网的私有地址;
本步骤中, 根据转换表项, 得到与所述目的设备的对外地址相对应的 私有地址。
步骤 406、 第二局域网的远程访问模块向目的设备转发所述报文; 本步骤中, 第二局域网的远程访问模块将所述目的设备的私有地址作 为所述报文的新的目的地址, 向第二局域网转发所述报文。
步骤 401至步骤 406为第一局域网向第二局域网发送报文的过程, 第 二局域网向第一局域网发送报文的过程与上述过程基本一致, 在此不再赘 述。
本发明实施例提供的一种信息同步方法, 在两个局域网以远程访问的 形式连接时, 通过设备通过的对外地址进行通信, 在发送报文时, 将报文 的源地址由私有地址转换为对外地址, 以所述对外地址作为新的源地址发 送报文; 在接收报文时, 将报文的目的地址由对外地址转换为私有地址, 根据所述私有地址将报文发向接收方, 不需要更改设备原有的私有地址, 只是对地址进行转换来完成通信, 解决了在地址冲突时无法通信的问题。
在两个基于 UPnP协议以远程访问形式连接的局域网之间,如果在通信 过程中报文的应用层携带地址信息, 则需要对所述地址信息进行转换, 本 发明实施例五提供了一种信息同步方法, 能够实现对地址信息的转换, 该 方法如图 7所示, 包括:
步骤 701、第一局域网的远程访问模块接收第一局域网向第二局域网发 送的报文;
本步骤中, 对于第一局域网来说, 当其下的第一局域网设备向第二局 域网发送报文时, 报文会先到达第一局域网的远程访问模块, 由第一局域 网的远程访问模块进行地址转换。
发送所述报文的源设备(第一局域网设备)位于第一局域网, 接收所 述报文的目的设备 (第二局域网设备)位于第二局域网; 所述报文的源地 址为源设备在第一局域网中的私有地址, 所述报文的目的地址为目的设备 在第一局域网中存储的地址。 如果所述第二局域网中的目的设备有对应的 对外地址, 则所述目的地址为所述目的设备的对外地址, 否则为所述目的 设备的私有地址。
在本实施例中, 所述 >¾文的应用层携带有地址信息, 所述地址信息包 含第一局域网中的私有地址, 例如, 报文内容中携带一个 URL (统一资源 定位符), 所述 URL带有第一局域网设备的私有地址。
步骤 702、 第一局域网的远程访问模块进行地址转换;
本步骤中, 需要对所述报文的源地址, 即源设备的私有地址进行转换, 同时, 还需要对所述地址信息中包含的第一局域网中的私有地址进行转换。 其中, 对"¾文源地址的转换的具体步骤参见本发明实施例四中的步骤 402。 下面详细介绍对所述地址信息中包含的第一局域网中的私有地址进行转换 的步骤。
如图 8所示, 步骤 7021、 第一局域网的远程访问模块获取应用层中的 地址信息;
本步骤中, 需要对报文内容进行分析, 从报文内容中提取地址信息, 如, 报文内容中携带一个 URL (统一资源定位符), 所述 URL带有第一局 域网中的私有地址, 则本步骤需要获取所述 URL中携带的私有地址。
步骤 7022、 第一局域网的远程访问模块对所述应用层中的地址信息进 行转换;
第一局域网的远程访问模块根据步骤 7021获取的私有地址, 查找转换 表项; 根据转换表项, 将所述私有地址映射为对应的对外地址。
步骤 7023、第一局域网的远程访问模块更新所述应用层中的地址信息; 第一局域网的远程访问模块用转换得到的对外地址替换私有地址, 更 新所述应用层中的地址信息。
需要说明的是, 所述应用层中的地址信息可能包含第一局域网中的多 个私有地址, 而每一个私有地址也可能在应用层中的多个位置出现, 需要 把这些私有地址全部替换为对应的对外地址。
步骤 703、 第一局域网的远程访问模块向第二局域网转发所述报文; 本步骤中, 将与所述4艮文源地址对应的对外地址作为所述 4艮文的新的 源地址, 将报文向第二局域网转发。
步骤 704、 第二局域网的远程访问模块接收所述报文;
本步骤中, 第二局域网的远程访问模块接收第一局域网发送的报文。 步骤 705、 第二局域网的远程访问模块进行地址转换;
本步骤中, 需要对报文的目的地址及报文应用层携带的地址信息进行 转换, 其中, 对报文的目的地址进行转换的步骤参见本发明实施例四的步 骤 405。下面结合附图,介绍对报文应用层携带的地址信息进行转换的过程。 该过程如图 9所示, 包括:
步骤 7051、 第二局域网的远程访问模块获取应用层中的地址信息; 本步骤中, 需要对报文内容进行分析, 从报文内容中提取地址信息, 如, 报文内容中携带一个 URL (统一资源定位符), 所述 URL带有第二局 域网中设备的对外地址, 则本步骤需要获取所述 URL中携带的第二局域网 中设备的对外地址。
步骤 7052、 第二局域网的远程访问模块对所述应用层中的地址信息进 行转换;
本步骤中, 根据步骤 7051获取的对外地址, 查找转换表项; 根据转换 表项, 将所述对外地址映射为对应的私有地址。
步骤 7053、第二局域网的远程访问模块更新所述应用层中的地址信息; 本步骤中, 用转换得到的私有地址替换对外地址, 更新所述应用层中 的地址信息。
需要说明的是, 所述应用层中的地址信息可能包含第二局域网中多个 设备的对外地址, 而每一个设备的对外地址也可能在应用层中的多个位置 出现, 需要把这些对外地址全部替换为对应的私有地址。
步骤 706、 第二局域网的远程访问模块向目的设备转发所述报文; 本步骤中, 第二局域网的远程访问模块将所述目的设备的私有地址作 为所述报文的新的目的地址, 向第二局域网转发所述报文。
本发明实施例提供的一种信息同步方法, 在两个局域网以远程访问的 形式连接时, 通过设备之间通过的对外地址进行通信, 在发送报文时, 将 4艮文的源地址由私有地址转换为对外地址, 以所述对外地址作为新的源地 址发送报文; 在接收报文时, 将报文的目的地址由对外地址转换为私有地 址, 根据所述私有地址将报文发向接收方, 不需要更改设备原有的私有地 址, 只是对地址进行转换来完成通信, 解决了在地址冲突时无法通信的问 题。 同时还需对报文应用层携带的地址信息进行转换, 解决了在地址冲突 时 UPnP协议无法正常工作的问题。
如图 10所示, 本发明的实施例还提供了一种信息同步装置, 包括: 私有地址获耳 莫块 1001, 用于获取第一局域网设备在第一局域网中的 宣告信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中的私 有地址;
地址映射模块 1002, 用于根据预先设置的私有地址与对外地址的映射 关系, 将所述私有地址获耳 莫块 1001获取的第一局域网设备的私有地址映 射为对应的对外地址;
同步信息发送模块 1003 , 用于向第二局域网发送携带所述地址映射模 块 1002映射得到的对外地址的通知消息, 以使得所述第二局域网保存所述 第一局域网设备的对外地址, 并将所述第一局域网设备的状态通知所述第 二局域网中的第二局域网设备。
进一步地, 上述信息同步装置如图 11所示, 还包括:
映射关系更新模块 1004, 用于更新私有地址与对外地址的映射关系, 以使得所述地址映射模块 1002能够根据更新后的私有地址与对外地址的映 射关系, 将第一局域网设备的私有地址映射为对外地址; 和 /或,
通信模块 1005,用于使用所述地址映射模块 1002映射得到的第一局域 网设备的对外地址与第二局域网进行通信。
进一步地, 如图 12所示, 所述映射关系更新模块 1004可以包括: 对端信息获取单元 10041, 用于获取所述第二局域网中的私有地址; 地址分配单元 10042,用于根据所述对端信息获取单元 10041获取的第 二局域网中的私有地址, 确定所述第一局域网设备的私有地址与所述第二 局域网中的私有地址冲突时, 为所述第一局域网设备分配对外地址, 所述 对外地址为所述第一局域网和所述第二局域网未使用的私有地址;
映射关系建立单元 10043,用于在所述第一局域网设备私有地址与所述 地址分配单元 10042分配的对外地址之间建立映射关系。
进一步地, 如图 13所示, 所述通信模块 1005可以包括:
信息发送单元 10051,用于接收所述第一局域网设备向第二局域网发送 的报文, 根据所述第一局域网设备的私有地址与对外地址的映射关系, 获 取所述第一局域网设备的私有地址对应的对外地址, 将所述对外地址作为 所述报文的新的源地址, 向第二局域网发送所述报文; 和 /或,
信息接收单元 10052,用于接收第二局域网向所述第一局域网设备发送 的报文, 根据所述第一局域网设备的私有地址与对外地址的映射关系, 获 取所述第一局域网设备的私有地址, 将所述私有地址作为所述 文的新的 目的地址, 向第一局域网发送所述报文。
进一步地, 所述信息发送单元 10051 还可以包括: 第一替换子单元, 用于将所述信息发送单元 10051发送的报文应用层中包含的第一局域网设 备的私有地址替换为对应的对外地址;
所述信息接收单元 10052还可以包括: 第二替换子单元, 用于将所述 信息接收单元 10052接收的报文应用层中包含的第一局域网设备的对外地 址替换为对应的私有地址。
本发明实施例提供的信息同步装置, 能够将第一局域网设备的私有地 址转换成对外地址, 并通知第二局域网, 使得第二局域网能够保存所述第 一局域网设备的对外地址, 并将所述第一局域网设备的状态通知第二局域 网设备, 达到了第一局域网设备和第二局域网设备之间信息同步的目的, 由于本发明实施例提供的技术方案能够将第一局域网设备的私有地址转换 成对外地址, 所以解决了第一局域网和第二局域网之间可能存在地址冲突 的问题, 从而达到避免地址冲突的目的。
如图 14所示, 本发明的实施例还提供了一种信息同步系统, 包括第一 信息同步装置 1401和第二信息同步装置 1402;所述第一信息同步装置 1401 和第二信息同步装置 1402分别位于第一局域网和第二局域网; 所述第一信息同步装置 1401, 用于获取第一局域网设备在第一局域网 中的宣告信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中 的私有地址, 根据预先设置的私有地址与对外地址的映射关系, 将所述第 一局域网设备的私有地址映射为对应的对外地址, 向所述第二信息同步装 置 1402发送携带所述第一局域网设备对外地址的通知消息;
所述第二信息同步装置 1402,用于接收所述第一信息同步装置 1401发 送的通知消息, 存储所述通知消息中携带的所述第一局域网设备的对外地 址, 并向所述第二局域网中的第二局域网设备通知所述第一局域网设备的 状态。
本发明实施例提供的信息同步系统, 第一信息同步装置能够将第一局 域网设备的私有地址转换成对外地址, 并通知第二局域网的第二信息同步 装置, 使得第二信息同步装置能够保存所述第一局域网设备的对外地址, 并将所述第一局域网设备的状态通知第二局域网设备, 达到了第一局域网 设备和第二局域网设备之间信息同步的目的, 由于本发明实施例提供的技 术方案能够将第一局域网设备的私有地址转换成对外地址, 所以解决了第 一局域网和第二局域网之间可能存在地址冲突的问题, 从而达到避免地址 冲突的目的。
本领域普通技术人员可以理解实现上述实施例方法携带的全部或部分 步骤是可以通过程序来指令相关的硬件完成, 所述的程序可以存储于一种 计算机可读存储介质中, 该程序在执行时, 包括方法实施例的步骤之一或 其组合。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处理模块 中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在 一个模块中。 上述集成的模块既可以采用硬件的形式实现, 也可以采用软 件功能模块的形式实现。 所述集成的模块如果以软件功能模块的形式实现 并作为独立的产品销售或使用时, 也可以存储在一个计算机可读取存储介 质中。
上述提到的存储介质可以是只读存储器, 磁盘或光盘等。 以上所述的具体实施方式, 对本发明的目的、 技术方案和有益效果进 行了进一步详细说明, 所应理解的是, 以上所述仅为本发明的具体实施方 式而已, 并不用于限定本发明的保护范围, 凡在本发明的精神和原则之内, 所做的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种信息同步方法, 其特征在于, 包括:
获取第一局域网设备在第一局域网中的宣告信息, 所述宣告信息中包 含所述第一局域网设备在第一局域网中的私有地址;
根据预先设置的私有地址与对外地址的映射关系, 将所述第一局域网 设备的私有地址映射为对应的对外地址;
向第二局域网发送携带所述第一局域网设备对外地址的通知消息, 以 使得所述第二局域网保存所述第一局域网设备的对外地址, 并将所述第一 局域网设备的状态通知所述第二局域网中的第二局域网设备。
2、 根据权利要求 1所述的信息同步方法, 其特征在于, 所述根据预先 设置的私有地址与对外地址的映射关系, 将所述第一局域网设备的私有地 址映射为对应的对外地址之前, 还包括:
更新私有地址与对外地址的映射关系。
3、 根据权利要求 2所述的信息同步方法, 其特征在于, 所述更新私有 地址与对外地址的映射关系包括:
获取所述第二局域网中的私有地址;
如果所述第一局域网设备的私有地址与所述第二局域网中的私有地址 冲突, 则为所述第一局域网设备分配对外地址, 所述对外地址为所述第一 局域网和所述第二局域网未使用的私有地址;
在所述第一局域网设备私有地址与所述对外地址之间建立映射关系。
4、 根据权利要求 1所述的信息同步方法, 其特征在于, 还包括: 使用所述第一局域网设备的对外地址与第二局域网进行通信。
5、 根据权利要求 4所述的信息同步方法, 其特征在于, 所述使用所述 第一局域网设备的对外地址与第二局域网进行通信包括:
接收所述第一局域网设备向第二局域网发送的报文, 所述报文的源地 址为所述第一局域网设备的私有地址; 根据所述第一局域网设备的私有地址与对外地址的映射关系, 获取所 述第一局域网设备的私有地址对应的对外地址;
将所述对外地址作为所述报文的新的源地址, 向第二局域网发送该报 文; 或者,
接收第二局域网向所述第一局域网设备发送的报文, 所述报文的目的 地址为所述第一局域网设备的对外地址;
根据所述第一局域网设备的私有地址与对外地址的映射关系, 获取所 述第一局域网设备的私有地址;
将所述私有地址作为所述报文的新的目的地址, 向第一局域网发送该 报文。
6、 根据权利要求 5所述的信息同步方法, 其特征在于, 还包括: 将所述报文应用层中包含的第一局域网设备的私有地址替换为对应的 对外地址; 或者,
将所述报文应用层中包含的第一局域网设备的对外地址替换为对应的 私有地址。
7、 一种信息同步装置, 其特征在于, 包括:
私有地址获取模块, 用于获取第一局域网设备在第一局域网中的宣告 信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中的私有地 址;
地址映射模块, 用于根据预先设置的私有地址与对外地址的映射关系, 将所述私有地址获取模块获取的第一局域网设备的私有地址映射为对应的 对外地址;
同步信息发送模块, 用于向第二局域网发送携带所述地址映射模块映 射得到的对外地址的通知消息, 以使得所述第二局域网保存所述第一局域 网设备的对外地址, 并将所述第一局域网设备的状态通知所述第二局域网 中的第二局域网设备。
8、 根据权利要求 7所述的信息同步装置, 其特征在于, 还包括: 映射关系更新模块, 用于更新私有地址与对外地址的映射关系; 和 /或, 通信模块, 用于使用所述地址映射模块映射得到的第一局域网设备的 对外地址与第二局域网进行通信。
9、 根据权利要求 8所述的信息同步装置, 其特征在于, 所述映射关系 更新模块包括:
对端信息获取单元, 用于获取所述第二局域网中的私有地址; 地址分配单元, 用于根据所述对端信息获取单元获取的第二局域网中 的私有地址, 确定所述第一局域网设备的私有地址与所述第二局域网中的 私有地址冲突时, 为所述第一局域网设备分配对外地址, 所述对外地址为 所述第一局域网和所述第二局域网未使用的私有地址;
映射关系建立单元, 用于在所述第一局域网设备私有地址与所述地址 分配单元分配的对外地址之间建立映射关系。
10、 根据权利要求 9所述的信息同步装置, 其特征在于, 所述通信模 块包括:
信息发送单元, 用于接收所述第一局域网设备向第二局域网发送的报 文, ^居所述第一局域网设备的私有地址与对外地址的映射关系, 获取所 述第一局域网设备的私有地址对应的对外地址, 将所述对外地址作为所述 报文的新的源地址, 向第二局域网发送该报文; 和 /或,
信息接收单元, 用于接收第二局域网向所述第一局域网设备发送的报 文, ^居所述第一局域网设备的私有地址与对外地址的映射关系, 获取所 述第一局域网设备的私有地址, 将所述私有地址作为所述 >¾文的新的目的 地址, 向第一局域网发送该报文。
11、 根据权利要求 10所述的信息同步装置, 其特征在于, 所述信息发 送单元, 还包括: 第一替换子单元, 用于将所述信息发送单元发送的报文 应用层中包含的第一局域网设备的私有地址替换为对应的对外地址;和 /或, 所述信息接收单元, 还包括:
第二替换子单元, 用于将所述信息接收单元接收的报文应用层中包含 的第一局域网设备的对外地址替换为对应的私有地址。
12、 一种信息同步系统, 其特征在于, 包括第一信息同步装置和第二 信息同步装置; 所述第一信息同步装置和第二信息同步装置分别位于第一 局域网和第二局域网;
所述第一信息同步装置, 用于获取第一局域网设备在第一局域网中的 宣告信息, 所述宣告信息中包含所述第一局域网设备在第一局域网中的私 有地址, 根据预先设置的私有地址与对外地址的映射关系, 将所述第一局 域网设备的私有地址映射为对应的对外地址, 向所述第二信息同步装置发 送携带所述第一局域网设备对外地址的通知消息;
所述第二信息同步装置, 用于接收所述第一信息同步装置发送的通知 消息, 存储所述通知消息中携带的所述第一局域网设备的对外地址, 向所 述第二局域网中的第二局域网设备通知所述第一局域网设备的状态。
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US20120079053A1 (en) 2012-03-29
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KR101323629B1 (ko) 2013-11-01
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