JP3589089B2 - Communication protocol proxy processing method, communication protocol proxy processing device, and communication protocol proxy processing service device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to proxy processing of a communication protocol performed on a movable node such as a portable node or a node on a movable sub-network, and in particular, moves with an arbitrary node on a network to which a plurality of nodes are connected. The present invention relates to a communication protocol proxy processing method for transferring a packet to and from a possible node via another node, and a communication protocol proxy processing apparatus and a communication protocol proxy processing service apparatus for realizing the method.
[0002]
[Prior art]
2. Description of the Related Art In a computer network such as the Internet, it is common to employ an industry standard IP (Internet Protocol). In this case, each node in the network assigns an IP address which is a unique address on the IP. Must have. Since packets transmitted and received between the nodes are routed based on the IP address, basically, it is necessary that the IP address and the position of the node have a fixed one-to-one correspondence.
[0003]
By the way, in recent years, portable terminals that can be easily moved have been rapidly infiltrating, and cases of using them as nodes of a computer network (hereinafter, portable nodes) are increasing. However, in the conventional IP, when the portable node moves to another position on the network, a packet addressed to the portable node is not routed to the portable node. Therefore, in a next-generation IP (hereinafter referred to as a portable IP in this specification) proposed by a committee for standardization of the Internet such as the IETF (Internet Engineering Task Force), even if the portable node moves, A communication protocol proxy process is defined so that a packet addressed to the destination can be correctly routed.
[0004]
In this communication protocol proxy process, when the portable node moves into another sub-network and detects that an IP address has been re-assigned due to this movement, the portable node assigns the newly assigned IP address to the former. Notify the proxy processing node in the subnetwork that has been set. Thereafter, the packet addressed to the portable node is encapsulated by the tunneling header and transferred from the proxy processing node to the portable node.
[0005]
Hereinafter, the operation of the computer network employing the above-described communication protocol proxy processing method will be described with reference to FIG. In FIG. 10, reference numeral 10 denotes a wide area communication network such as the Internet, and 21 and 22 each denote a LAN (Local Area Network), which are interconnected by the wide area communication network 10. Reference numerals 31 and 32 denote routers connected to the wide area communication network 10, respectively. The router 31 is included in the LAN 21, and the router 32 is included in the LAN 22.
[0006]
40 is a receiving node that receives a packet transmitted to itself from an arbitrary node in the computer network, 51 and 52 are portable IP proxy processing devices, respectively. The portable IP proxy processing device 52 is arranged in the router 32. Reference numeral 60 denotes a certain transmitting node in the computer network, which transmits a packet addressed to the receiving node 40 here.
[0007]
In the above-described configuration, when the receiving node 40 moves from the LAN 21 to the LAN 22, the receiving node 40 transmits the newly assigned IP address to the portable IP proxy processing device of the LAN 21 via the portable IP proxy processing device 52 of the LAN 22. Notify 51. In such a situation, when the transmitting node 60 transmits a packet addressed to the receiving node 40 without knowing that the receiving node 40 has moved, the packet is intercepted by the portable IP proxy processor 51 of the LAN 21 and The data is transferred to the receiving node 40 via the IP proxy processing device 52.
[0008]
[Problems to be solved by the invention]
However, when not only a single receiving node but also a subnetwork (for example, a LAN) including a proxy processing node (a router having a portable IP proxy processing device) moves, transmission that does not know that the receiving node has moved is performed. Even if a packet is transmitted from the node to the receiving node, the packet is not routed to the surrogate processing node. That is, the packet is not received by the proxy processing node, and therefore, the packet does not reach the desired receiving node.
[0009]
On the other hand, when the proxy processing node is located outside the moved subnetwork, as described above, the packet addressed to the receiving node transmitted from the transmitting node that does not know that the receiving node has moved moves to the desired receiving node. However, each node on the moved sub-network individually notifies the newly assigned IP address to the proxy processing node. That is, the above notification is performed for all nodes on the moved sub-network, which is inefficient.
[0010]
The present invention has been made in view of the circumstances described above, and each node on a moved sub-network does not individually notify a new address to a proxy processing node, and transmits a packet addressed to the moved receiving node to the receiving node. It is an object of the present invention to provide a communication protocol proxy processing method capable of reliably transferring data to a communication protocol proxy server, and a communication protocol proxy processing apparatus and a communication protocol proxy processing service apparatus for realizing the method.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a communication protocol proxy processing method according to claim 1, wherein a mobile sub-network having a proxy processing node for routing a packet to its destination address and at least one receiving node, and the proxy processing are provided. A communication protocol including a wide area communication network to which a node is connected, and specifying an address of the node by a combination of a global identifier for identifying the subnetwork and a local identifier for identifying the node in the subnetwork A communication protocol proxy processing method for transferring a packet addressed to the receiving node to the receiving node after moving the sub-network, in a network equipped with a communication protocol capable of performing a tunneling process,
The subnetwork notifies the wide area network of a set of the old global identifier assigned to the subnetwork before the movement and the current global identifier and the local identifier of the proxy processing node assigned to the subnetwork after the movement. A notification step;
A tunneling header providing step in which the wide area network adds a tunneling header including the address of the proxy processing node as a destination address to a packet addressed to the receiving node to generate a tunneling packet;
A tunneling packet transfer step of transferring the tunneling packet to the proxy processing node;
A tunneling header removing step of removing the tunneling header from the tunneling packet;
A destination address conversion step of changing a global identifier included in a destination address of a packet addressed to the receiving node obtained by removing the tunneling header by the tunneling header removing step to the current global identifier;
A packet transfer step of transferring a packet whose global identifier of the destination address has been changed by the destination address conversion step to the receiving node;
It is characterized by having.
[0012]
Further, in the above method, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 2), the wide area communication network may be a mobile communication network, and the proxy processing node may be a wireless communication network. The router may be a router (Claim 3), or the wide area communication network sends a destination address of the proxy processing node to a packet addressed to the receiving node before sending the packet to the receiving node. A global identifier change instructing step for instructing to add a tunneling header included as an address may be provided (claim 4).
[0013]
In order to solve the above-mentioned problem, a communication protocol proxy processing device according to claim 5 is a device that is included in a movable sub-network having at least one receiving node and connected to a wide area communication network. A communication protocol that specifies a node address by a combination of a global identifier for identifying the sub-network and a local identifier for identifying a node in the sub-network, and that enables a tunneling process. A communication protocol proxy processing device for transferring a packet addressed to the receiving node to the receiving node after moving the sub-network in the mounted network,
Sub storage means for storing a current global identifier assigned to the subnetwork after the move and an old global identifier assigned to the subnetwork before the move,
The current global identifier, the old global identifier, and the local identifier of the own device are associated with each other and registered on the wide area communication network side, and a request is made to transfer a tunneling packet including a packet addressed to the receiving node to the own device. Registration request means;
Packet receiving means for receiving a tunneling packet addressed to the own device;
Header conversion means for extracting a packet included in the tunneling packet and changing a global identifier included in the destination address to the current global identifier;
Packet transfer means for transferring a packet whose global identifier has been changed by the header conversion means to the receiving node;
It is characterized by having.
[0014]
According to this configuration, when the current global identifier and the old global identifier are registered in association with each other on the wide area communication network side, a tunneling packet addressed to the own device is transmitted, and the tunneling packet is received. After the header is removed, the global identifier included in the destination address of the packet is changed to the current global identifier, and the changed packet is transferred to the sub-network.
[0015]
Further, in the communication protocol proxy processing device, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 6), or the wide area communication network may be a mobile communication network, The registration request unit and the packet receiving unit may communicate with the wide area communication network via a wireless communication path.
[0016]
In order to solve the above-mentioned problem, a communication protocol proxy processing service device according to claim 8 provides a mobile sub-network having a proxy processing node for routing a packet to its destination address and at least one receiving node. A communication protocol which is included in a connected wide area communication network and specifies a node address by a combination of a global identifier for identifying the sub-network and a local identifier for identifying a node in the sub-network. A communication protocol proxy processing service device for transferring a packet addressed to the receiving node to the receiving node after moving the sub-network in a network implementing a communication protocol that enables tunneling processing,
A global storage means for storing the current global identifier assigned to the sub-network after the movement, the old global identifier assigned to the sub-network before the movement, and the local identifier of the proxy processing node in association with each other;
Route request means for requesting the wide area network to route the packet addressed to the receiving node to the own device;
Packet reception processing proxy means for receiving a packet addressed to the receiving node;
A tunneling header providing unit that adds a tunneling header including the address of the proxy processing node as a destination address to the packet received by the packet reception proxy processing unit to generate a tunneling packet;
Packet transfer means for transferring the tunneling packet to the sub-network;
It is characterized by having.
[0017]
According to this configuration, a packet (a packet addressed to the receiving node) including the old global identifier in the destination address arrives at the communication protocol proxy processing service device, the device receives the packet, and the proxy process is performed on the packet. A tunneling header including the address of the node as a destination address is provided, and the packet is forwarded to the subnetwork. The transferred packet is received by the proxy processing node. Therefore, after the proxy processing node removes the tunneling header and transfers the packet to the node corresponding to the local identifier in the destination address, the packet arriving at the communication protocol proxy processing service device reaches the desired node.
[0018]
Further, in the communication protocol proxy processing service device, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 9), or the wide area communication network may be a mobile communication network, The proxy processing node may be a wireless router, and the packet transfer means may communicate with the sub-network via a wireless transmission path (claim 10). Destination movement correspondence instructing means for transmitting a message instructing a source node to attach a tunneling header including the address of the proxy processing node as a destination address to a packet addressed to the receiving node before transmitting the packet; (Claim 11).
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Prior to a specific description of an embodiment of the present invention, first, a basic policy adopted by the present invention and a realization policy for realizing a process based on the policy in the present embodiment will be described. In the present embodiment, the communication protocol targeted for the proxy service is a portable IP (for example, IPv6: IP version 6) employing a 128-bit address expression.
[0020]
A: Basic policy
In the present invention, a proxy processing server is arranged on the wide area communication network side outside the moving sub-network, and communication between the proxy processing node on the sub-network side and the proxy processing server is performed to support movement of the sub-network. , A proxy service for communication protocol processing represented by packet reception.
[0021]
B: Implementation policy
In the portable IP according to the present embodiment, a prefix is assigned to each subnetwork constituting the whole. Since the length of the prefix (hereinafter, prefix length) is not fixed, the address (host address) of the node in the portable IP is represented by a set of a 128-bit address including the prefix (global identifier) and the prefix length. Be converted to In the present embodiment, when the sub-network moves, the proxy processing node determines the prefix (hereinafter the current prefix) and the prefix length newly allocated to the sub-network, and the prefix (the old prefix) allocated before the movement. Using the (prefix) and the prefix length, the proxy processing server is requested to perform proxy processing of the portable IP.
[0022]
Further, in the present embodiment, the proxy processing server is disposed on the wide area communication network side corresponding to the portable IP in order to prevent the proxy processing server from moving together with each sub-network. Further, in the present embodiment, the portability of the subnetwork is ensured by using the wide area communication network as the mobile communication network and the proxy processing node in each subnetwork as the wireless router.
[0023]
Finally, in the present embodiment, when the sub-network moves, the prefix and the prefix length are transmitted and received between the proxy processing server on the mobile communication network side and the proxy processing node on the sub-network side, so that the portable IP Substitute registration of processing is performed collectively. In this embodiment, the proxy processing of the portable IP is realized by transferring a tunneling packet obtained by using the prefix and the prefix length between the proxy processing server and the proxy processing node.
[0024]
C: Overall configuration
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to such an embodiment, and various changes can be made within the scope of the technical idea.
FIG. 1 is a diagram showing a configuration of a communication system employing a portable IP proxy processing method according to an embodiment of the present invention. In this figure, reference numeral 70 denotes a mobile communication network corresponding to the portable IP, and reference numeral 80 denotes a LAN (sub-network) corresponding to the portable IP, which is wirelessly connected to the mobile communication network 70. Reference numeral 90 denotes a wireless router (proxy processing node) for routing packets between a wirelessly connected upper-level network (mobile communication network 70) and a wiredly connected subnetwork (LAN 80), and 100 is disposed in the wireless router 90. Portable IP proxy processing device. Details of the functions of the portable IP proxy processing device 100 will be described later.
[0025]
A receiving node 300 receives a packet transmitted from any node in the system to itself, and is connected to the LAN 80. Reference numeral 200 denotes a portable IP proxy processing service device which communicates with the portable IP proxy processing device 100 to perform a portable IP proxy process, and is arranged in the mobile communication network 70. Details of the functions of the portable IP proxy processing service device 200 will be described later. Reference numerals 71 and 72 denote base stations of the mobile communication network 70, respectively, which establish a wireless communication path between the wireless router 90 existing in each area and the own station. Communication between the LAN 80 and the mobile communication network 70 is performed via this wireless communication path.
[0026]
Reference numeral 400 denotes a certain transmitting node in the system, which transmits a packet addressed to the receiving node 300 here. Although the transmitting node 400 directly connected to the mobile communication network 70 is illustrated in the drawing, the transmitting node 400 is connected to the mobile communication network 70 via a wireless router (or a wired router) and a base station like the receiving node 300. A node that is wirelessly connected may be the transmitting node 400.
[0027]
D: Configuration of main part
Next, a configuration of a main part of the communication system will be described with reference to FIG.
FIG. 2 is a block diagram showing a configuration of the portable IP proxy processing device 100, the portable IP proxy processing service device 200, and the receiving node 300 in the communication system.
[0028]
D-1: Portable IP Proxy Processing Device 100
The portable IP proxy processing device 100 includes a current prefix holding unit 110, a prefix management unit 120, a prefix registration unit (registration request unit) 130, a packet reception processing unit (packet reception unit) 140, and a header conversion unit (header conversion unit) 150. , A packet transfer unit (packet transfer means) 160, and a prefix management table 170. The current prefix holding unit 110, the prefix management unit 120, and the prefix management table 170 constitute a sub storage unit.
[0029]
The current prefix holding unit 110 holds the current prefix and its prefix length. In addition, the current prefix holding unit 110 stores a prefix and a prefix length which are periodically notified from a lower layer interface located above a WAN (Wide Area Network) protocol / physical layer due to the movement of the LAN 80 including the own apparatus 100. If the current prefix and its prefix length are different from the currently held prefix and its prefix length, the prefix notified from the lower layer interface and its prefix length are stored as the current prefix and its prefix length, and these current prefixes and their prefix lengths and their valid The time limit is supplied to the prefix management unit 120, and the current prefix and the prefix length are transmitted to the LAN 80 including the own device 100.
In addition, even when the prefix and its prefix length periodically notified from the lower layer interface match the current prefix and its prefix length being held, the current prefix holding unit 110 sets the new expiration date thereof. It is sequentially supplied to the prefix management unit 120.
[0030]
Upon receiving the current prefix, the prefix length thereof, and their expiration date from the current prefix holding unit 110, the prefix management unit 120 stores them in the prefix management table 170. The prefix management table 170 also includes, in addition to the above, a main prefix mainly assigned to the LAN 80 including the own apparatus 100, its prefix length and their expiration date, a previously assigned prefix and its prefix length and their validity. Although the expiration date can be stored, it is assumed here that only the former is stored in order to avoid complicating the description. When the prefix management unit 120 stores the current prefix, its prefix length, and their expiration date, the prefix within the expiration date in the prefix management table 170 and its prefix length are only the current prefix and its prefix length. The prefix management unit 120 reads out the contents of the prefix management table 170 and responds to an external inquiry.
[0031]
The prefix registration unit 130 acquires the main prefix and its prefix length, the current prefix and its prefix length via the prefix management unit 120, and transmits a registration message including these and the address of the own device 100 to the WAN protocol / physical The information is transmitted to the portable IP proxy processing service device 200 via a lower layer interface located above the layer. This registration message is a message requesting the portable IP proxy processing.
[0032]
The packet reception processing unit 140 receives a packet addressed to the own device 100 from a lower layer interface located above the WAN protocol / physical layer.
[0033]
If the packet received by the packet reception processing unit 140 is a packet including the address of the own device 100 in the destination address of the tunneling header, the header conversion unit 150 removes the tunneling header and then sends the packet to the prefix management unit 120. The current prefix for the main prefix included in the destination address of the packet is inquired, the prefix in the destination address is rewritten with the current prefix, and the rewritten packet is sent to the packet transfer unit 160.
[0034]
The packet transfer unit 160 transfers the packet from the header conversion unit 150 to the reception node 300 via a lower layer interface located above the LAN protocol / physical layer.
[0035]
D-2: Portable IP Proxy Processing Service Device 200
The portable IP proxy processing service device 200 includes a prefix holding unit 210, a prefix management unit 220, a route request unit (route request unit) 230, a packet reception proxy processing unit (packet reception processing proxy unit) 240, a tunneling header adding unit (tunneling). A header transfer unit 250, a packet transfer unit (packet transfer unit) 260, a prefix management table 270, and a destination move correspondence instruction unit (destination move correspondence instruction unit) 280. The prefix holding unit 210, the prefix management unit 220, and the prefix management table 270 constitute a global storage unit.
[0036]
The prefix holding unit 210 receives the registration message from the portable IP proxy processing device 100 via the WAN protocol / physical layer, and the main prefix, its prefix length, the current prefix, the prefix length, and the portable IP proxy in this message. The address of the processing device 100 is held.
[0037]
The prefix management unit 220 stores the information held by the prefix holding unit 210 in the prefix management table 270, reads the contents of the prefix management table 270, and responds to an external inquiry.
[0038]
The route requesting unit 230 transmits a route request message including the main prefix, the prefix length, and the address of the device 200 such that a packet including the main prefix registered in the prefix management table 270 in the destination address is routed to the own device 200. To the WAN protocol / physical layer.
[0039]
The packet reception proxy processing unit 240 converts the packet (the packet including the main prefix registered in the prefix management table 270 into the destination address) requested by the route requesting unit 230 by transmitting the route request message into the WAN protocol / physical Receive through layers.
[0040]
When the packet (packet addressed to the portable IP proxy processing device 100) is received by the packet reception proxy processing unit 240, the tunneling header adding unit 250 inquires the prefix management unit 220 and checks the address of the portable IP proxy processing device 100. And a tunneling header is added to the packet.
[0041]
When receiving the packet to which the tunneling header is added by the tunneling header adding unit 250, the packet transfer unit 260 determines an output interface to the device (portable IP proxy processing device 100) of the destination address, and uses the output interface. The packet is transmitted to the WAN protocol / physical layer.
[0042]
When the destination address of the packet received by the packet reception processing proxy unit 240 includes the main prefix registered in the prefix management table 270, the destination movement correspondence instructing unit 280 sends the packet to the source node of the packet. Before transmitting the packet to the destination address including the prefix, a message instructing to add a tunneling header including the address of the portable IP proxy processing device 100 as the destination address is transmitted via the WAN protocol / physical layer.
[0043]
D-3: Receiving node 300
The receiving node 300 has a prefix receiving unit 310, a self-node address management unit 320, a packet reception processing unit 330, and a self-node management table 340.
The prefix receiving unit 310 receives a prefix and a prefix length assigned to the own device 300 from a lower layer interface located above the LAN protocol / physical layer.
[0044]
The self-node address management unit 320 configures the self-node address using the prefix and the prefix length received by the prefix reception unit 310, registers the self-node address in the self-node address management table 340, and stores the self-node address in the self-node address management table 340. Read the contents and respond to external inquiries.
[0045]
The packet reception processing unit 330 receives a packet addressed to the own node address registered in the management table 340.
[0046]
E: Operation
Next, the operation of the communication system will be described with reference to FIGS. In FIGS. 3 to 9, the same reference numerals are given to portions common to FIG. 1. In the present embodiment, x, y, z and a each represent one digit of a hexadecimal number (that is, four bits), and the prefix and address represented by these characters are four digits according to a general notation. In each case, a delimiter “:” is inserted. Further, in the drawings and the following description, when a prefix exists alone without being combined with a local address (local identifier) for identifying a node in a subnetwork, ":: /" is added to the end of the prefix. Notation such as “n” that specifies the number n of bits of the prefix is adopted.
[0047]
In the present embodiment, since the length of the address is fixed to 128 bits, notation of the number of bits at the end of the address is omitted in the drawings and the following description. In addition, in order to avoid a complicated description, a description regarding an expiration date attached to each prefix is omitted.
[0048]
FIGS. 3 to 9 show the portable IP proxy processing when the LAN 80 including the portable IP proxy processing apparatus 100 and the receiving node 300 moves from the base station 71 to which the LAN 80 is normally connected to the base station 72. FIG. 9 is a conceptual diagram illustrating the operation of the system, and the portable IP proxy processing system sequentially executes the processing illustrated in FIGS. 3 to 8 and performs the processing illustrated in FIG. 9.
[0049]
First, as shown in FIG. 3, when the LAN 80 existing under the base station 1 and assigned the prefix xxxx: xxxx: xxxx: xxxx :: / 64 moves under the base station 2, the LAN 80 Then, a new prefix yyyy: yyyy: yyyy: yyyy :: / 64 is assigned. As a result, yyyy: yyyy: yyyy: yyyy :: / 64 is stored as the current prefix in the prefix management table 170 of the portable IP proxy processing device 100 existing in the LAN 80. At this point, the prefix management table 170 stores xxxx: xxxx: xxxx: xxxx: / 64 as the main prefix.
[0050]
Next, as shown in FIG. 4, the main prefix xxxx: xxxx: xxxx: xxxx :: / 64 and the current prefix yyyy: yyyy: yyyy: A registration message including yyyy :: / 64 and the address yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zzzz: zzzz of the own device 100 is transmitted. As a result, the main prefix, the current prefix, and the address of the portable IP proxy processing device 100 are stored in the prefix management table 270 (notification step).
[0051]
Next, as shown in FIG. 5, a packet to the LAN 80 to which the prefix xxxx: xxxx: xxxx: xxxx: // 64 is assigned from the portable IP proxy processing service device 200 to the mobile communication network 70 is transmitted to the own device 200. A route request message requesting the transfer is transmitted. As a result, as shown in FIG. 6, when a packet having a destination address of xxxx: xxxx: xxxx: xxxa: aaaa: aaaa: aaaa is transmitted from the transmission node 400, the packet is transmitted to the portable IP proxy processing service device. 200.
[0052]
Next, in the portable IP proxy processing service device 200, a tunneling header is added to the packet (a tunneling header adding step). The destination address in the tunneling header is the address yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zzzz: zzzz of the portable IP proxy processing device 100, and the packet to which the tunneling header is added is as shown in FIG. The transfer is performed from the portable IP proxy processing service device 200 to the portable IP proxy processing device 100 (a tunneling packet transfer step).
[0053]
Next, in the portable IP proxy processing device 100 that has received the packet, the tunneling header is removed from the packet (tunneling header removal step), and the destination address of the packet from which the tunneling header has been removed is xxxx: xxxx: xxxx: xxxx. : Aaaa: aaaa: aaaa: aaaa to yyy: yyyy: yyyy: yyaa: aaaa: aaaa: aaaa (destination address conversion step) (equivalent to the prefix yyyy: yyyy: yyyy: yyyy: network). The packet is transferred to the (LAN 80) side (packet transfer step). This packet is received by the receiving node 300 whose own address is yyyy: yyyy: yyyy: yyyy: aaa: aaa: aaaa.
[0054]
Also, in the portable IP proxy processing service device 200 that has received the packet from the transmitting node 400 to the receiving node 300, the destination address for the tunneling process via the portable IP proxy processing device 100 is performed in parallel with the above processing. A process of notifying yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zzzz: zzzz to the transmitting node 400 (global identifier change instruction step) is performed. The destination address notified to the transmitting node 400 is held in the transmitting node 400.
[0055]
Thereafter, in the transmission node 400, the packet to xxxx: xxxx: xxxx: xxxx: aaaa: aaaa: aaaa is the address yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zzzz of the portable IP proxy processing device 100. Sent after a tunneling header including zzzz is added. That is, the packet from the transmitting node 400 to the receiving node 300 is transferred to the receiving node 300 via the portable IP proxy processing device 100 without passing through the portable IP proxy processing service device 200.
[0056]
F: Supplement
As described above, according to this embodiment, even when the LAN 80 including the portable IP proxy processing device 100 moves, the packet from the outside of the LAN 80 to the receiving node 300 in the LAN 80 is reliably transferred to the receiving node 300. .
In addition, by notifying the portable IP proxy processing service device 200 of the prefix indicating the LAN 80, it becomes possible to transfer packets addressed to all nodes in the LAN 80.
[0057]
Further, according to the present embodiment, after notifying the destination address included in the tunneling header from the portable IP proxy processing service device 200 to the transmitting node 400, the transmitting node 400 uses the tunneling header including the destination address to transmit a packet. Is transmitted, it is possible to avoid concentration of load and traffic on the portable IP proxy processing service device 200.
[0058]
Further, in the present embodiment, a mobile communication network is adopted as a wide area communication network and is compatible with the next generation IP in the Internet, so that a high degree of integration between a mobile communication network and a computer network is realized. Therefore, various data communications that have long been realized in the computer network field can be realized in the mobile communication field, and the high portability that was originally realized in the mobile communication field can also be realized in the computer network field. can do.
[0059]
As described above, the present invention is not limited to the above-described embodiment. Within the scope of the technical concept of the present invention, for example, the following various changes can be made.
(1) In the above-described embodiment, the registration message includes the current prefix of the LAN 80, the prefix length thereof, and the address of the portable IP proxy processing device 100. However, this system is capable of handling the local address alone. If so, the local address of the portable IP proxy processing device 100 may be used instead of the address of the portable IP proxy processing device 100.
[0060]
(2) In the present embodiment, as described above, when the transmitting node 400 receives the message from the destination movement correspondence instruction unit 280 of the portable IP proxy processing service device 200, the transmitting node 400 performs the subsequent communication with the node in the LAN 80. It is performed using a tunneling packet having the address of the portable IP proxy processing apparatus 100 as a destination address. However, if the portable IP proxy processing apparatus 100 includes a unit for receiving a normal packet other than the tunneling packet. Alternatively, the transmitting node 400 may transmit a normal packet that is not a tunneling packet.
[0061]
For example, before transmitting a packet of a destination address including the main prefix registered in the prefix management table 270, a message from the destination movement correspondence instruction unit 280 of the portable IP proxy processing service device 200 is changed to a destination address prefix of the packet. This is a message instructing to change to the current prefix registered in the prefix management table 270. If the transmitting node 400 operates according to this message, the packet transmitted from the transmitting node 400 reaches the portable IP proxy processing device 100 without passing through the portable IP proxy processing service device 200, and is routed as a normal packet here. Is done.
[0062]
(3) The communication protocol targeted for the proxy processing is not limited to the portable IP. In short, a communication protocol having a tunneling function and capable of specifying a destination of a packet with an address composed of an identifier (for example, a prefix) assigned to each subnetwork and an identifier (for example, a local address) assigned within the subnetwork. If there is, it can be a target of proxy processing in the present invention. Of course, the length of each identifier may be variable / fixed.
[0063]
(4) The wide area communication network is not limited to the mobile communication network. The point is that the portable IP proxy processing service device 200 can be installed in a network that permits the movement of the sub-network and does not move with the movement of the sub-network, and permits the communication protocol described in (3). Any network can be used.
[0064]
【The invention's effect】
As described above, according to the present invention, the packet to the moved sub-network is received by the wide area communication network and is reliably transferred to the sub-network. That is, even if a subnetwork having at least one node moves, communication between a node in the subnetwork and a node outside the subnetwork can be maintained. Also, by moving, by registering the global identifier newly assigned to the sub-network on the wide area communication network side, the same effect as registering the addresses of all nodes in the sub-network for proxy processing is obtained. Is obtained, the transfer amount of the packet for address registration can be reduced as compared with the case where each node individually registers the moved address.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a communication system employing a portable IP proxy processing method according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a portable IP proxy processing device 100, a portable IP proxy processing service device 200, and a receiving node 300 in the communication system.
FIG. 3 is a conceptual diagram for explaining an operation of the communication system.
FIG. 4 is a conceptual diagram for explaining an operation of the communication system.
FIG. 5 is a conceptual diagram for explaining an operation of the communication system.
FIG. 6 is a conceptual diagram for explaining an operation of the communication system.
FIG. 7 is a conceptual diagram for explaining an operation of the communication system.
FIG. 8 is a conceptual diagram for explaining an operation of the communication system.
FIG. 9 is a conceptual diagram for explaining an operation of the communication system.
FIG. 10 is a conceptual diagram showing a configuration of a computer network employing a conventional communication protocol proxy processing method.
[Explanation of symbols]
70 Mobile communication network
71,72 base station
80 LAN
90 wireless router
100 Portable IP proxy processing device
110 Current prefix holder
120 prefix management unit
130 Prefix registration unit
140 packet reception processing unit
150 Header conversion unit
160 packet transfer unit
170 prefix management table
200 Portable Internet Protocol proxy processing service device
210 Prefix holder
220 Prefix management unit
230 Route request section
240 Packet reception processing agency
250 Tunneling header adding unit
260 Packet transfer unit
270 prefix management table
280 Address movement correspondence instruction section
300 receiving node
310 prefix receiving unit
320 own node address management unit
330 packet reception processing unit
340 own node address management table
400 sending node

Claims (11)

A mobile subnetwork having a surrogate processing node for routing packets to its destination address and at least one receiving node, and a wide area network to which the surrogate processing node is connected, and for identifying the subnetwork. In a network in which a communication protocol for specifying an address of a node by a combination of a global identifier and a local identifier for identifying a node in the sub-network and which implements a tunneling process is provided, the movement of the sub-network A communication protocol proxy processing method for later transferring a packet addressed to the receiving node to the receiving node,
The subnetwork notifies the wide area network of a set of the old global identifier assigned to the subnetwork before the movement and the current global identifier and the local identifier of the proxy processing node assigned to the subnetwork after the movement. A notification step;
A tunneling header providing step in which the wide area network adds a tunneling header including the address of the proxy processing node as a destination address to a packet addressed to the receiving node to generate a tunneling packet;
A tunneling packet transfer step of transferring the tunneling packet to the proxy processing node;
A tunneling header removing step of removing the tunneling header from the tunneling packet;
A destination address conversion step of changing a global identifier included in a destination address of a packet addressed to the receiving node obtained by removing the tunneling header by the tunneling header removing step to the current global identifier;
A packet transfer step of transferring a packet whose destination address global identifier has been changed by the destination address conversion step to the receiving node. The method according to claim 1, wherein the communication protocol is an Internet protocol, and the global identifier is a combination of a prefix and a prefix length. 2. The communication protocol proxy processing method according to claim 1, wherein the wide area communication network is a mobile communication network, and the proxy processing node is a wireless router. The wide area network instructs a source node of the packet addressed to the receiving node to add a tunneling header including the address of the proxy processing node as a destination address to the packet addressed to the receiving node before transmitting the packet. The method according to claim 1, further comprising a global identifier change instruction step. A device included in a mobile sub-network having at least one receiving node and connected to a wide area network, a global identifier for identifying the sub-network and a node for identifying a node in the sub-network. To transfer a packet addressed to the receiving node to the receiving node after moving the sub-network in a network that implements a communication protocol that specifies a node address in combination with a local identifier and that enables a tunneling process. A communication protocol proxy processing device, sub-storage means for storing the current global identifier assigned to the sub-network after the move and the old global identifier assigned to the sub-network before the move,
The current global identifier, the old global identifier, and the local identifier of the own device are associated with each other and registered on the wide area communication network side, and a request is made to transfer a tunneling packet including a packet addressed to the receiving node to the own device. Registration request means;
Packet receiving means for receiving a tunneling packet addressed to the own device;
Header conversion means for extracting a packet included in the tunneling packet and changing a global identifier included in the destination address to the current global identifier;
A communication protocol proxy processing device, comprising: a packet transfer unit that transfers a packet whose global identifier has been changed by the header conversion unit to the receiving node. The communication protocol proxy processing device according to claim 5, wherein the communication protocol is an Internet protocol, and the global identifier is a combination of a prefix and a prefix length. The communication protocol proxy processing device according to claim 5, wherein the wide area communication network is a mobile communication network, and the registration request unit and the packet receiving unit communicate with the wide area communication network via a wireless communication path. . A device included in a wide area network connected to a mobile sub-network having a surrogate processing node for routing a packet to its destination address and at least one receiving node, a global identifier for identifying said sub-network, In a network that implements a communication protocol that specifies a node address in combination with a local identifier for identifying a node in the subnetwork and that implements a communication protocol that enables a tunneling process, the receiving node after moving the subnetwork. A communication protocol proxy processing service device for transferring a packet addressed to the receiving node,
A global storage means for storing the current global identifier assigned to the sub-network after the movement, the old global identifier assigned to the sub-network before the movement, and the local identifier of the proxy processing node in association with each other;
Route request means for requesting the wide area network to route the packet addressed to the receiving node to the own device;
Packet reception processing proxy means for receiving a packet addressed to the receiving node;
A tunneling header providing unit that adds a tunneling header including the address of the proxy processing node as a destination address to the packet received by the packet reception proxy processing unit to generate a tunneling packet;
And a packet transfer unit for transferring the tunneling packet to the sub-network. The communication protocol proxy processing service device according to claim 8, wherein the communication protocol is an Internet protocol, and the global identifier is a combination of a prefix and a prefix length. 9. The communication according to claim 8, wherein the wide area communication network is a mobile communication network, the proxy processing node is a wireless router, and the packet transfer unit communicates with the sub-network via a wireless transmission path. Protocol proxy processing service device. Instruct the transmission source node of the packet received by the packet reception processing proxy unit to add a tunneling header including the address of the proxy processing node as a destination address to the packet addressed to the reception node before transmitting the packet. 9. The communication protocol proxy processing service apparatus according to claim 8, further comprising destination movement correspondence instruction means for transmitting a message.

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