WO2024038578A1 - Système, procédé et programme de communication - Google Patents

Système, procédé et programme de communication Download PDF

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Publication number
WO2024038578A1
WO2024038578A1 PCT/JP2022/031344 JP2022031344W WO2024038578A1 WO 2024038578 A1 WO2024038578 A1 WO 2024038578A1 JP 2022031344 W JP2022031344 W JP 2022031344W WO 2024038578 A1 WO2024038578 A1 WO 2024038578A1
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WIPO (PCT)
Prior art keywords
transfer device
unit
packet
address
information regarding
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PCT/JP2022/031344
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English (en)
Japanese (ja)
Inventor
眞成 渡辺
諭士 中務
勇樹 武井
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日本電信電話株式会社
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Priority to PCT/JP2022/031344 priority Critical patent/WO2024038578A1/fr
Publication of WO2024038578A1 publication Critical patent/WO2024038578A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to a communication system, a communication method, and a communication program.
  • the problem with the conventional technology is that the requirements for providing low latency and closed area are limited. This is because in conventional communication formats, it is not possible to allocate communication networks or enter communication networks using the access network due to the tunnels of each network.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a communication system, a communication method, and a communication program that make it possible to suppress delays and improve closure.
  • a communication system of the present invention includes a distribution device, a first transfer device, and a second transfer device, and the distribution device transmits information regarding a communication route.
  • a first acquisition unit that acquires the information, and a distribution unit that transmits information regarding the communication route acquired by the first acquisition unit to the first transfer device and the second transfer device, and the first transfer device and the second transfer device include a second acquisition unit that acquires the packet and information regarding the communication route distributed by the distribution unit, a destination IP address of the packet acquired by the second acquisition unit, and a second acquisition unit that acquires the packet and information regarding the communication route distributed by the distribution unit; a first determination unit that determines whether or not the information regarding the communication route acquired by the second acquisition unit matches; a first rewriting unit that rewrites the header of a packet that has been rewritten based on the information regarding the communication route acquired by the second acquisition unit; and a first rewriting unit that rewrites the header of the packet that has been
  • FIG. 1 is a diagram for explaining an overview of the communication system of this embodiment.
  • FIG. 2 is a block diagram showing the configuration of the distribution device of this embodiment.
  • FIG. 3 is a block diagram showing the configuration of the transfer device of this embodiment.
  • FIG. 4 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 5 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 6 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 7 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 8 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 9 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 10 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 10 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 11 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 12 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 13 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 14 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 15 is a diagram for explaining processing by the communication system of this embodiment.
  • FIG. 16 is a diagram summarizing information regarding routes used by the communication system of this embodiment.
  • FIG. 17 is a flowchart showing the processing procedure by the transfer device of this embodiment.
  • FIG. 18 is a flowchart showing the processing procedure by the transfer device of this embodiment.
  • FIG. 19 is a diagram illustrating an example of a computer that executes a communication program.
  • the distribution device 100 distributes information regarding a communication path to the first transfer device 200A and the second transfer device 200B.
  • the first transfer device 200A or the second transfer device 200B analyzes the packet and determines whether or not it has the IP address to be controlled using the information regarding the communication route obtained in advance and the packet at the time of transmission. The decision is made using the information regarding the communication route created from .
  • the first transfer device 200A or the second transfer device 200B encaps/decaps the header and resolves protocol differences between the different networks. Realize on-board communication.
  • it is possible to establish a tunnel that directly connects the first transfer device 200A and the second transfer device 200B. can.
  • the communication system 1 includes a distribution device 100, a first transfer device 200A, and a second transfer device 200B.
  • the distribution device 100 distributes information necessary for entering a heterogeneous network to the first transfer device 200A and the second transfer device 200B.
  • the first transfer device 200A transmits the packet to be transferred to the second transfer device 200B based on the information regarding the communication route distributed by the distribution device 100.
  • the second transfer device 200B transfers the packet transmitted by the first transfer device 200A based on information regarding the communication route distributed by the distribution device 100 or information regarding the communication route created by the first transfer device 200A. and send it to a mobile or fixed terminal.
  • the distribution device 100 includes a communication section 110, a control section 120, and a storage section 130. Note that each of these units may be held in a distributed manner by a plurality of devices. The processing of each of these parts will be explained below.
  • the communication unit 110 is realized by a NIC (Network Interface Card) or the like, and enables communication between an external device and the control unit 120 via a telecommunication line such as a LAN (Local Area Network) or the Internet.
  • a NIC Network Interface Card
  • LAN Local Area Network
  • the communication unit 110 enables communication between an external device and the control unit 120.
  • the storage unit 130 is realized by a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, or a storage device such as a hard disk or an optical disk.
  • the information stored in the storage unit 130 includes, for example, information on IP address pools, information on destination IP addresses that are subject to different network distribution, and terminals that have destination IP addresses that are subject to different network distribution. It includes information on the route to the router, information linking the mobile terminal's IP address and GTP-U tunnel information, and other information necessary for switching to a different network. Note that the information stored in the storage unit 130 is not limited to what is described above.
  • the control unit 120 is realized using a CPU (Central Processing Unit), an NP (Network Processor), an FPGA (Field Programmable Gate Array), etc., and executes a processing program stored in a memory. As shown in FIG. 2, the control unit 120 includes a first acquisition unit 121 and a distribution unit 122. Each section included in the control section 120 will be described below.
  • the first acquisition unit 121 acquires information regarding the communication route. For example, the first acquisition unit 121 acquires, as information regarding the communication route, information on an IP address pool, information on a destination IP address that is subject to different network allocation, and destination IP address that is subject to different network allocation. Information about the route to the router that accommodates the terminal is acquired from the storage unit 130.
  • the distribution unit 122 distributes the information regarding the communication route acquired by the first acquisition unit 121 to the first transfer device 200A and the second transfer device 200B. For example, the distribution unit 122 transmits the information on the IP address pool acquired by the first acquisition unit 121, the information on the destination IP address to be subjected to different network allocation, and the destination IP address to be subjected to different network allocation. Information about the route to the router that accommodates the terminal with the address is distributed to the first transfer device 200A and the second transfer device 200B.
  • the transfer device 200 includes a communication section 210, a control section 220, and a storage section 230. Note that each of these units may be held in a distributed manner by a plurality of devices. The processing of each of these parts will be explained below.
  • the communication unit 210 is realized by a NIC (Network Interface Card) or the like, and enables communication between an external device and the control unit 220 via a telecommunication line such as a LAN (Local Area Network) or the Internet.
  • a NIC Network Interface Card
  • LAN Local Area Network
  • the communication unit 210 enables communication between an external device and the control unit 220.
  • the storage unit 230 is realized by a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, or a storage device such as a hard disk or an optical disk.
  • the information stored in the storage unit 230 includes, for example, an IP address pool, a destination IP address subject to different network distribution, and a route to a router that accommodates a terminal having a destination IP address subject to different network distribution. information, information linking the mobile terminal's IP address and GTP-U tunnel information, and other information necessary for switching to a different network. Note that the information stored in the storage unit 230 is not limited to what is described above.
  • the control unit 220 is realized using a CPU (Central Processing Unit), an NP (Network Processor), an FPGA (Field Programmable Gate Array), etc., and executes a processing program stored in a memory. As shown in FIG. 3, the control unit 220 includes a second acquisition unit 221a, a third acquisition unit 221b, a first determination unit 222a, a second determination unit 222b, and a first determination unit 223a. , the second determination section 223b, the first rewriting section 224a, the second rewriting section 224b, the creation section 225, the processing section 226, the first transmission section 227a, and the second transmission section 227b. and has. Each section included in the control section 220 will be described below.
  • the second acquisition unit 221a acquires information regarding the packet and the communication route distributed by the distribution unit 122. For example, the second acquisition unit 221a obtains, as information regarding the communication route distributed by the distribution unit 122, information on IP address pools, information on destination IP addresses that are subject to different network allocation, and information on destination IP addresses that are subject to different network allocation. Obtain information on the route to the router that accommodates the terminal with the target destination IP address. Further, for example, the second acquisition unit 221a acquires information linking the IP address of the mobile terminal and GTP-U tunnel information from the C-Plane communication as information regarding the communication route.
  • the first determining unit 222a determines whether a predetermined protocol is used in the packet acquired by the second acquiring unit 221a. For example, the first determining unit 222a determines whether GTP-U (GPRS Tunneling Protocol For User Plane) is used in the packet acquired by the second acquiring unit 221a. Further, for example, the first determining unit 222a determines whether the packet acquired by the second acquiring unit 221a includes a QinQ tag. Note that the above is an example, and does not limit the predetermined protocol that is determined by the first determining unit 222a.
  • GTP-U GPRS Tunneling Protocol For User Plane
  • the first determination unit 223a determines whether the destination IP address of the packet acquired by the second acquisition unit 221a matches the information regarding the communication route acquired by the second acquisition unit 221a. Further, for example, when the first determining unit 222a determines that a predetermined protocol is used, the first determining unit 223a determines that the destination IP address of the packet acquired by the second acquiring unit 221a, It is determined whether the information regarding the communication route acquired by the second acquisition unit 221a matches.
  • the first determining unit 223a determines that the destination IP address of the packet determined by the first determining unit 222a to use GTP-U is a different network that is acquired by the second acquiring unit 221a. It is determined whether the destination IP address matches the destination IP address to be distributed. Further, for example, the first determination unit 223a determines that the destination IP address of the packet determined by the first determination unit 222a to include the QinQ tag is connected to a heterogeneous network acquired by the second acquisition unit 221a. It is determined whether the destination IP address matches the target destination IP address.
  • the first rewriting unit 224a rewrites the header of the packet determined to be a match by the first determining unit 223a, based on the information regarding the communication route acquired by the second acquiring unit 221a. For example, the first rewriting unit 224a rewrites the source IP address of the packet determined to be a match by the first determining unit 223a to an IP address owned by a PE router functioning as the transfer device 200.
  • the first rewriting unit 224a may change the header of the packet determined to match by the first determining unit 223a to the destination IP address of the target for accessing the heterogeneous network acquired by the second acquiring unit 221a.
  • MPLS Multi Protocol Label Switching
  • the creation unit 225 creates information regarding the communication route based on the information regarding the communication route acquired by the second acquisition unit 221a and the packet whose header has been rewritten by the first rewriting unit 224a. For example, information regarding the communication route is created based on the information regarding the communication route acquired by the second acquisition unit 221a and the packet whose source IP address has been changed by the first rewriting unit 224a.
  • the creation unit 225 also includes information on a route to a router that accommodates a terminal having a destination IP address that is a target for accessing a heterogeneous network, acquired by the second acquisition unit 221a, and Based on the packet whose source IP address has been changed to the IP address of the PE router functioning as the transfer device 200, the changed source IP address, the original source IP address, and the different network distribution Information about a communication route is created, including information about a route to a router that accommodates a terminal having a target destination IP address.
  • the first transmitting unit 227a transmits the packet whose header has been rewritten by the first rewriting unit 224a to the first transfer device 200A or second transfer device 200B existing in a different VPN.
  • the first transmitting unit 227a of the first transfer device 200A transmits the packet to which the MPLS label is added by the first rewriting unit 224a to the second transfer device 200B.
  • the first transmitter 227a of the second transfer device 200B transmits the packet to which the MPLS label has been added by the first rewrite unit 224a to the first transfer device 200A.
  • the third acquisition unit 221b acquires the packet transmitted by the first transmission unit 227a, information regarding the communication route distributed by the distribution unit 122, and information regarding the communication route created by the creation unit 225.
  • the third acquisition unit 221b collects the packet transmitted by the first transmission unit 227a, the information of the IP address pool distributed by the distribution unit 122, and the destination IP address that is the target of heterogeneous network distribution.
  • information information on the route to the router that accommodates the terminal with the destination IP address that is the target of entering the heterogeneous network, the changed source IP address, and the original source IP created by the creation unit 225.
  • the third acquisition unit 221b acquires information linking the IP address of the mobile terminal and the GTP-U tunnel information from the C-Plane communication as information regarding the communication route.
  • the processing unit 226 processes the header of the packet acquired by the third acquisition unit 221b. For example, the processing unit 226 removes the MPLS label from the header of the packet acquired by the third acquisition unit 221b.
  • the second determining unit 222b determines whether a predetermined protocol is used in the packet acquired by the third acquiring unit 221b. For example, the second determining unit 222b determines whether GTP-U is used in the packet acquired by the third acquiring unit 221b. Further, for example, the second determining unit 222b determines whether the packet acquired by the third acquiring unit 221b includes a QinQ tag. Note that the above is an example, and the second determination unit 222b does not limit the predetermined protocol to be determined.
  • the second determination unit 223b determines whether the destination IP address of the packet acquired by the third acquisition unit 221b matches the information regarding the communication route acquired by the third acquisition unit 221b. For example, if the second determining unit 222b determines that the predetermined protocol is not used, the second determining unit 223b may select the destination IP address of the packet acquired by the third acquiring unit 221b and the third determining unit 223b. It is determined whether or not the information regarding the communication route acquired by the acquisition unit 221b matches. Further, for example, the second determining unit 223b uses the destination IP address of the packet determined by the second determining unit 222b as not including a QinQ tag, and the heterogeneous network transmission acquired by the third acquiring unit 221b. It is determined whether or not the target destination IP address matches the destination IP address.
  • the second determining unit 223b uses the destination IP address of the packet determined by the second determining unit 222b as not using GTP-U and the heterogeneous network acquired by the third acquiring unit 221b. It is determined whether or not the destination IP address to be allocated matches.
  • the second rewriting unit 224b rewrites the header of the packet determined to be a match by the second determining unit 223b, based on the information regarding the communication route acquired by the third acquiring unit 221b. For example, the second rewriting unit 224b transfers the header of the packet determined to be a match by the second determining unit 223b to the destination IP address network based on the information regarding the communication route acquired by the third acquiring unit 221b. Rewrite to appropriate tunnel header. As a specific example, if the terminal indicated by the destination IP address is a mobile terminal, the second rewriting unit 224b rewrites it to a GTP-U tunnel header. Further, for example, if the terminal indicated by the destination IP address is a fixed terminal, the second rewriting unit 224b rewrites it to a QinQ tunnel header.
  • the second rewriting unit 224b changes the header of the packet determined to match by the second determining unit 223b to the destination IP address of the terminal based on the information regarding the communication route created by the creating unit 225. Rewrite to IP address.
  • the second transmitting unit 227b transmits the packet whose header has been rewritten by the second rewriting unit 224b to the terminal.
  • the second transmitting unit 227b of the first transfer device 200A transmits a packet whose header has been rewritten by the second rewriting unit 224b to a fixed terminal or a mobile terminal.
  • the second transmitting unit 227b of the second transfer device 200B transmits the packet whose header has been rewritten by the second rewriting unit 224b to a fixed terminal or a mobile terminal.
  • the distribution unit 122 of the distribution device 100 distributes information regarding the communication path to the first transfer device 200A located on the fixed terminal side and the second transfer device 200B located on the mobile terminal side. For example, a destination IP address to be connected to a heterogeneous network, and MPLS label information as route information to the opposing PE router (first transfer device 200A or second transfer device 200B) that accommodates a terminal with the IP address. is distributed to the first transfer device 200A and the second transfer device 200B.
  • the first transfer device 200A and the second transfer device 200B to which the information regarding the communication route has been distributed, create a table that includes information regarding the IP address and header rewriting that are to be entered into the heterogeneous network.
  • the second acquisition unit 221a or the third acquisition unit 221b of the second transfer device 200B that accommodates the mobile terminal acquires the IP address of the mobile terminal and the GTP- Obtain information that links U tunnel information and create a table. It is assumed that the second transfer device 200B creates a table containing information linking the terminal IP address and GTP-U tunnel information each time the session is changed.
  • the first transfer device 200A determines whether the packet is to be transferred. At this time, for example, the first determining unit 222a of the first transfer device 200A determines that QinQ is used. Further, for example, the first determination unit 223a of the first transfer device 200A compares the destination IP address of the packet transmitted from the fixed terminal with a table containing information regarding the communication route acquired in advance. , it is determined whether the packet is a target of switching to a different network.
  • the first rewriting unit 224a of the first transfer device 200A rewrites the header of the packet if the packet is to be transferred. For example, the first rewriting unit 224a of the first transfer device 200A rewrites the source IP address of the packet to be transferred to the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A sends a message containing the post-NAT assigned IP address, the fixed terminal IP address (source IP address), and the S/C-tag information corresponding to the destination IP address. Create information about routes.
  • the first rewriting unit 224a of the first transfer device 200A adds an MPLS label to the packet to be transferred. Then, the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B.
  • the second transfer device 200B analyzes the transmitted packet.
  • the second determining unit 222b of the second transfer device 200B determines whether GTP-U is used in the transmitted packet. Then, if GTP-U is not used, the second rewriting unit 224b of the second transfer device 200B rewrites the header using information that links the mobile terminal's IP address and GTP information. Then, the second transmitter 227b of the second transfer device 200B transmits a packet to the mobile terminal using the GTP information.
  • the second acquisition unit 221a of the second transfer device 200B acquires a packet as a response from the mobile terminal. Then, the first rewriting unit 224a of the second transfer device 200B rewrites the header if the packet is to be transferred. For example, the first rewriting unit 224a of the second transfer device 200B adds an MPLS label to the packet to be transferred. The first transmitter 227a of the second transfer device 200B then transmits the packet with the MPLS label to the first transfer device 200A.
  • the first transfer device 200A obtains the packet transmitted from the second transfer device 200B and performs packet analysis. If a predetermined protocol is not used for the packet (for example, QinQ), the second rewriting unit 224b of the first transfer device 200A rewrites the header using information linking the fixed terminal IP address and QinQ information. rewrite. Then, the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the fixed terminal.
  • a predetermined protocol for example, QinQ
  • the second rewriting unit 224b of the first transfer device 200A rewrites the header using information linking the fixed terminal IP address and QinQ information. rewrite.
  • the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the fixed terminal.
  • FIG. 6 is a diagram for explaining advance settings when communicating from a terminal under the fixed network to a terminal under the mobile network.
  • FIG. 6(1) shows advance settings performed by distributing information regarding communication paths from the distribution device 100 to the first transfer device 200A and the second transfer device 200B.
  • the distribution device 100 distributes, to the first transfer device 200A, information regarding a destination IP address that is a target of access to a heterogeneous network, and information on an MPLS label corresponding to the destination IP address.
  • the distribution device 100 distributes, to the second transfer device 200B, information regarding the destination IP address of the heterogeneous network, information on the MPLS label corresponding to the destination IP address, and information regarding GTP.
  • FIG. 6(2) shows advance setting performed by acquiring GTP tunnel information using the mobile terminal IP address as a key when the power is turned on of the terminal device that is the target of accessing the heterogeneous network on the mobile terminal side.
  • the second transfer device 200B acquires the fixed IP address and GTP information of the mobile terminal by connecting and registering with 5GC (5G Core).
  • 5GC 5G Core
  • the fixed IP address and GTP information of the mobile terminal are acquired using the method described in Patent Document 1.
  • FIG. 7(1) shows the flow of communication from a fixed terminal to a mobile terminal.
  • a fixed terminal transmits a packet whose source IP address is the fixed terminal and whose destination IP address is a mobile terminal.
  • the first rewriting unit 224a of the first transfer device 200A that received the packet uses the table containing information of the destination IP address and the MPLS label corresponding to the destination IP address, and uses the table containing the information of the destination IP address and the MPLS label corresponding to the destination IP address to The header is rewritten so that the source IP address becomes the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A includes information on the assigned IP address after NAT for address translation, the fixed terminal IP address, and the S/C-tag corresponding to the destination IP address. Create a table. Then, the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B.
  • the second rewriting unit 224b of the second transfer device 200B that received the packet transmitted from the first transfer device 200A uses a table containing the IP address and GTP information of the mobile terminal, Rewrites the packet header and encaps GTP. Then, the second transmitter 227b of the second transfer device 200B transmits the packet to the mobile terminal.
  • FIG. 7(2) shows a response from the mobile terminal to the fixed terminal.
  • the mobile terminal transmits a packet whose source IP address is the mobile terminal and whose destination IP address is the first transfer device 200A.
  • the first rewriting unit 224a of the second transfer device 200B that received the packet rewrites the packet header using a table including the destination IP address and MPLS label information corresponding to the destination IP address. , assigns an MPLS label.
  • the second transfer device 200B transmits the rewritten packet to the first transfer device 200A.
  • the second rewriting unit 224b of the first transfer device 200A that received the packet transmitted from the second transfer device 200B converts the assigned IP address after NAT, the fixed terminal IP address, and the destination IP address.
  • the destination IP address is changed to the IP address of the fixed terminal using a table containing S/C-tag information corresponding to the terminal.
  • the second rewriting unit 224b of the first transfer device 200A rewrites the packet header and encaps QinQ.
  • the second transmitter 227b of the first transfer device 200A transmits the packet to the fixed terminal.
  • QinQ encap when communicating from a mobile terminal to a fixed terminal, for example, QinQ encap can be performed in two patterns: one performed by the transfer device 200 on the mobile terminal side, and the other pattern performed by the transfer device 200 on the fixed terminal side. I will explain about it.
  • Pre-settings Using FIG. 8, the presetting of communication processing by the communication system 1 when communicating from a terminal under the mobile network to a terminal under the fixed network will be described.
  • QinQ encap is a pattern performed by the transfer device 200 on the mobile terminal side.
  • the distribution unit 122 of the distribution device 100 distributes information regarding the communication path to the first transfer device 200A located on the mobile terminal side and the second transfer device 200B located on the fixed terminal side.
  • a destination IP address to be connected to a heterogeneous network For example, a destination IP address to be connected to a heterogeneous network, and MPLS label information as route information to the opposing PE router (first transfer device 200A or second transfer device 200B) that accommodates a terminal with the IP address. and S/C-tag information corresponding to the destination IP address are distributed to the first transfer device 200A and the second transfer device 200B.
  • the S/C-tag information is sent from the distribution device 100 to the first transfer device 200A on the mobile terminal side, so that QinQ encap by the first transfer device 200A on the mobile terminal side is It becomes possible.
  • the first transfer device 200A and the second transfer device 200B to which the information regarding the communication route has been distributed, create a table that includes information regarding the IP address and header rewriting that are to be entered into the heterogeneous network.
  • the second acquisition unit 221a or third acquisition unit 221b of the first transfer device 200A that accommodates the mobile terminal acquires the IP address of the mobile terminal and the GTP- Obtain information that links U tunnel information and create a table. It is assumed that the first transfer device 200A creates a table containing information linking a terminal IP address and GTP-U tunnel information each time a session is changed.
  • the first transfer device 200A determines whether the packet is to be transferred. At this time, for example, the first determining unit 222a of the first transfer device 200A determines that GTP-U is used. Further, for example, the first determination unit 223a of the first transfer device 200A compares the destination IP address of the packet transmitted from the mobile terminal with a table containing information regarding the communication route acquired in advance. , it is determined whether the packet is a target of switching to a different network.
  • the first rewriting unit 224a of the first transfer device 200A rewrites the header of the packet if the packet is to be transferred. For example, the first rewriting unit 224a of the first transfer device 200A rewrites the source IP address of the packet to be transferred to the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A creates a table that includes information on the assigned IP address after NAT for address translation and the mobile terminal IP address.
  • the first rewriting unit 224a of the first transfer device 200A attaches an MPLS label to the packet to be transferred and encaps QinQ.
  • the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B.
  • the second transfer device 200B that received the packet performs processing as usual.
  • the second acquisition unit 221a of the second transfer device 200B acquires a packet as a response from a fixed terminal.
  • the first rewriting unit 224a of the second transfer device 200B rewrites the header if the packet is the target of the access determination.
  • the first rewriting unit 224a of the second transfer device 200B adds an MPLS label to the packet to be transferred.
  • the first transmitter 227a of the second transfer device 200B transmits the packet with the MPLS label to the first transfer device 200A.
  • the first transfer device 200A obtains the packet transmitted from the second transfer device 200B and performs packet analysis. If a predetermined protocol is not used for the packet (for example, GTP-U), the second rewriting unit 224b of the first transfer device 200A uses information that links the mobile terminal IP address and GTP information. Rewrite the header. Then, the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the mobile terminal.
  • a predetermined protocol for example, GTP-U
  • the second rewriting unit 224b of the first transfer device 200A uses information that links the mobile terminal IP address and GTP information. Rewrite the header.
  • the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the mobile terminal.
  • FIG. 10 is a diagram for explaining advance settings when communicating from a terminal under the mobile network to a terminal under the fixed network.
  • FIG. 10(1) shows advance settings performed by distributing information regarding communication paths from the distribution device 100 to the first transfer device 200A and the second transfer device 200B.
  • the distribution device 100 provides the first transfer device 200A with information regarding a destination IP address to be accessed into a heterogeneous network, information on an MPLS label corresponding to the destination IP address, and information on an MPLS label corresponding to the destination IP address. /C-tag information.
  • the distribution device 100 distributes, to the second transfer device 200B, information regarding the destination IP address of the heterogeneous network and information on the MPLS label corresponding to the destination IP address.
  • FIG. 10(2) shows advance settings performed by acquiring GTP tunnel information using the mobile terminal IP address as a key when the mobile terminal side turns on the power of the terminal device that is the target of accessing the heterogeneous network.
  • the first transfer device 200A acquires the fixed IP address and GTP information of the mobile terminal by connecting and registering with 5GC (5G Core).
  • 5GC 5G Core
  • the fixed IP address and GTP information of the mobile terminal are acquired using the method described in Patent Document 1.
  • FIG. 11(1) shows the flow of communication from a mobile terminal to a fixed terminal.
  • a mobile terminal transmits a packet whose source IP address is the mobile terminal and whose destination IP address is a fixed terminal.
  • the first rewriting unit 224a of the first transfer device 200A that received the packet writes the destination IP address, the MPLS label corresponding to the destination IP address, and the S/C-tag information corresponding to the destination IP address.
  • QinQ encap, and the header are rewritten so that the source IP address becomes the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A creates a table including the allocated IP address after NAT for address translation and the mobile terminal IP address. Then, the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B. Then, the second transmitter 227b of the second transfer device 200B, which has received the packet transmitted from the first transfer device 200A, transmits the packet to the fixed terminal.
  • FIG. 11(2) shows a response from the fixed terminal to the mobile terminal.
  • the fixed terminal transmits a packet whose source IP address is the fixed terminal and whose destination IP address is the first transfer device 200A.
  • the first rewriting unit 224a of the second transfer device 200B that received the packet rewrites the packet header using a table including the destination IP address and MPLS label information corresponding to the destination IP address. , assigns an MPLS label.
  • the first transmitter 227a of the second transfer device 200B transmits the rewritten packet to the first transfer device 200A.
  • the second rewriting unit 224b of the first transfer device 200A that received the packet transmitted from the second transfer device 200B includes information on the assigned IP address after NAT and the mobile terminal IP address.
  • the destination IP address is changed to the IP address of the mobile terminal using the table.
  • the second rewriting unit 224b of the first transfer device 200A uses a table containing the mobile terminal IP address and GTP information to rewrite the packet header and encap the GTP.
  • the second transmitter 227b of the first transfer device 200A transmits the packet to the mobile terminal.
  • a destination IP address to be connected to a heterogeneous network For example, a destination IP address to be connected to a heterogeneous network, and MPLS label information as route information to the opposing PE router (first transfer device 200A or second transfer device 200B) that accommodates a terminal with the IP address. and S/C-tag information corresponding to the destination IP address are distributed to the first transfer device 200A and the second transfer device 200B.
  • the S/C-tag information is sent from the distribution device 100 to the second transfer device 200B located on the fixed terminal side, so that the QinQ encap by the second transfer device 200B located on the fixed terminal side is It becomes possible.
  • the first transfer device 200A and the second transfer device 200B to which the information regarding the communication route has been distributed, create a table that includes information regarding the IP address and header rewriting that are to be entered into the heterogeneous network.
  • the second acquisition unit 221a or third acquisition unit 221b of the first transfer device 200A that accommodates the mobile terminal acquires the IP address of the mobile terminal and the GTP- Obtain information that links U tunnel information and create a table. It is assumed that the first transfer device 200A creates a table containing information linking a terminal IP address and GTP-U tunnel information each time a session is changed.
  • the first transfer device 200A determines whether the packet is to be transferred. At this time, for example, the first determining unit 222a of the first transfer device 200A determines that GTP-U is used. Further, for example, the first determination unit 223a of the first transfer device 200A compares the destination IP address of the packet transmitted from the mobile terminal with a table containing information regarding the communication route acquired in advance. , it is determined whether the packet is a target of switching to a different network.
  • the first rewriting unit 224a of the first transfer device 200A rewrites the header of the packet if the packet is to be transferred. For example, the first rewriting unit 224a of the first transfer device 200A rewrites the source IP address of the packet to be transferred to the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A creates a table that includes information on the assigned IP address after NAT for address translation and the mobile terminal IP address. Then, the first rewriting unit 224a of the first transfer device 200A attaches an MPLS label to the packet to be transferred.
  • the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B.
  • the second determining unit 222b of the second transfer device 200B that received the packet determines whether QinQ is used in the transmitted packet. Then, if QinQ is not used, the second rewriting unit 224b of the second transfer device 200B rewrites the header using information that links the mobile terminal's IP address and QinQ information. Then, the second transmitter 227b of the second transfer device 200B transmits the packet to the fixed terminal using the QinQ information.
  • the second acquisition unit 221a of the second transfer device 200B acquires a packet as a response from a fixed terminal.
  • the first rewriting unit 224a of the second transfer device 200B rewrites the header if the packet is the target of the access determination.
  • the first rewriting unit 224a of the second transfer device 200B adds an MPLS label to the packet to be transferred.
  • the first transmitter 227a of the second transfer device 200B transmits the packet with the MPLS label to the first transfer device 200A.
  • the first transfer device 200A obtains the packet transmitted from the second transfer device 200B and performs packet analysis. If a predetermined protocol is not used for the packet (for example, GTP-U), the second rewriting unit 224b of the first transfer device 200A uses information that links the mobile terminal IP address and GTP information. Rewrite the header. Then, the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the mobile terminal.
  • a predetermined protocol for example, GTP-U
  • the second rewriting unit 224b of the first transfer device 200A uses information that links the mobile terminal IP address and GTP information. Rewrite the header.
  • the second transmitter 227b of the first transfer device 200A transmits the packet with the rewritten header to the mobile terminal.
  • FIG. 14 is a diagram for explaining advance settings when communicating from a terminal under the mobile network to a terminal under the fixed network.
  • FIG. 14(1) shows advance settings performed by distributing information regarding communication paths from the distribution device 100 to the first transfer device 200A and the second transfer device 200B.
  • the distribution device 100 distributes, to the first transfer device 200A, information regarding a destination IP address that is a target of access to a heterogeneous network, and information on an MPLS label corresponding to the destination IP address.
  • the distribution device 100 provides the second transfer device 200B with information regarding the destination IP address of the heterogeneous network, information on the MPLS label corresponding to the destination IP address, and S/S/IP address corresponding to the destination IP address.
  • C-tag information is distributed.
  • FIG. 14(2) shows advance settings performed by acquiring GTP tunnel information using the mobile terminal IP address as a key when the power is turned on of the terminal device that is the target of accessing the heterogeneous network on the mobile terminal side.
  • the first transfer device 200A acquires the fixed IP address and GTP information of the mobile terminal by connecting and registering with the 5GC.
  • the fixed IP address and GTP information of the mobile terminal are acquired using the method described in Patent Document 1.
  • FIG. 15(1) shows the flow of communication from a mobile terminal to a fixed terminal.
  • a mobile terminal transmits a packet whose source IP address is the mobile terminal and whose destination IP address is a fixed terminal.
  • the first rewriting unit 224a of the first transfer device 200A that received the packet uses a table including the destination IP address and the MPLS label corresponding to the destination IP address, and adds and assigns MPLS label information.
  • the header is rewritten so that the source IP address becomes the IP address of the first transfer device 200A.
  • the creation unit 225 of the first transfer device 200A creates a table including the allocated IP address after NAT for address translation and the mobile terminal IP address. Then, the first transmitter 227a of the first transfer device 200A transmits the rewritten packet to the second transfer device 200B. Then, the second rewriting unit 224b of the second transfer device 200B that received the packet transmitted from the first transfer device 200A writes the destination IP address and the S/C-tag information corresponding to the destination IP address. Rewrite the header using the table containing the . The second transmitter 227b of the second transfer device 200B transmits the rewritten packet to the fixed terminal.
  • FIG. 15(2) shows a response from the fixed terminal to the mobile terminal.
  • the fixed terminal transmits a packet whose source IP address is the fixed terminal and whose destination IP address is the first transfer device 200A.
  • the first rewriting unit 224a of the second transfer device 200B that received the packet rewrites the packet header using a table including the destination IP address and MPLS label information corresponding to the destination IP address. , assigns an MPLS label.
  • the first transmitter 227a of the second transfer device 200B transmits the rewritten packet to the first transfer device 200A.
  • the second rewriting unit 224b of the first transfer device 200A that received the packet transmitted from the second transfer device 200B includes information on the assigned IP address after NAT and the mobile terminal IP address.
  • the destination IP address is changed to the IP address of the mobile terminal using the table.
  • the second rewriting unit 224b of the first transfer device 200A rewrites the packet header and encaps GTP using a table having mobile terminal IP addresses and GTP information.
  • the second transmitter 227b of the first transfer device 200A transmits the packet to the mobile terminal.
  • FIG. 16 is a diagram summarizing information about a table used when the transfer device 200 is present on the fixed terminal side and a table used when the transfer device 200 is present on the mobile terminal side.
  • steps S101 to S108 below can also be executed in a different order. Furthermore, some processes may be omitted from steps S101 to S108 below.
  • the second acquisition unit 221a acquires the packet and information regarding the communication route distributed by the distribution unit 122 (S101). For example, the second acquisition unit 221a obtains, as information regarding the communication route distributed by the distribution unit 122, information on IP address pools, information on destination IP addresses that are subject to different network allocation, and information on destination IP addresses that are subject to different network allocation. Obtain information on the route to the router that accommodates the terminal with the target destination IP address.
  • the first determining unit 222a determines whether a predetermined protocol is used in the packet acquired by the second acquiring unit 221a (S102). For example, the first determining unit 222a determines whether GTP-U is used in the packet acquired by the second acquiring unit 221a. Further, for example, the first determining unit 222a determines whether the packet acquired by the second acquiring unit 221a includes a QinQ tag.
  • the first determining unit 223a determines whether the communication route is the return route and matches the destination IP address. It is determined whether the information exists (S103). For example, the first determining unit 223a determines that the destination IP address of a packet that is a return trip and is determined to use GTP-U by the first determining unit 222a is acquired by the second acquiring unit 221a. It is determined whether the IP address matches the destination IP address to be transferred to a different network.
  • the first determination unit 223a determines that there is no information regarding the return route and the communication route that matches the destination IP address (S103 “NO”), then the first determination unit 223a , it is determined whether there is information regarding a communication route that is an outbound route and matches the destination IP address of the packet acquired by the second acquisition unit 221a (S104). For example, the first determination unit 223a determines that the destination IP address of a packet that is an outbound packet and is determined to use GTP-U by the first determination unit 222a is acquired by the second acquisition unit 221a. It is determined whether the IP address matches the destination IP address to be transferred to a different network.
  • the first rewriting unit 224a determines that there is information regarding a communication route that is an outbound route and matches the destination IP address (S104 "YES")
  • the first rewriting unit 224a The source IP address of the packet determined to be a match by the determining unit 223a is changed (S105).
  • the first rewriting unit 224a changes the source IP address of the packet determined to be a match by the first determining unit 223a to the IP address of the PE router functioning as the transfer device 200.
  • the creation unit 225 creates information regarding the communication route based on the information regarding the communication route acquired by the second acquisition unit 221a and the packet whose header has been rewritten by the first rewriting unit 224a ( S106). For example, the creation unit 225 uses the information on the route to the router that accommodates the terminal having the destination IP address that is the target of the heterogeneous network distribution acquired by the second acquisition unit 221a, and Based on the packet whose source IP address has been changed to the IP address of the PE router functioning as the transfer device 200, the changed source IP address and the original source IP address are the target of switching to a different network. Information about a communication route is created, including information about a route to a router that accommodates a terminal having a destination IP address.
  • the first rewriting unit 224a The header of the packet determined to match by the first determining unit 223a is rewritten based on the information regarding the communication route acquired by the second acquiring unit 221a (S107). For example, the first rewriting unit 224a adds the destination IP address, which is the target of the heterogeneous network allocation, acquired by the second acquisition unit 221a, to the header of the packet determined to be a match by the first determination unit 223a. Writes MPLS label information, which is information about the route to the router that accommodates the terminal.
  • the first transmitter 227a transmits the packet whose header has been rewritten by the first rewrite unit 224a to the first transfer device 200A or second transfer device 200B existing in a different VPN (S108).
  • the first determining unit 222a determines that the predetermined protocol is not used (S102 "NO"), or the first determining unit 223a determines that the communication route is an outbound route and matches the destination IP address. If it is determined that there is no information regarding the transfer device (S104 "NO"), the process by the transfer device 200 ends.
  • steps S201 to S206 below can also be executed in a different order. Also, some of the steps S201 to S206 described below may be omitted.
  • the third acquisition unit 221b acquires the packet transmitted by the first transmission unit 227a, information regarding the communication route distributed by the distribution unit 122, and information regarding the communication route created by the creation unit 225. (S201). For example, the third acquisition unit 221b collects the packet transmitted by the first transmission unit 227a, the information of the IP address pool distributed by the distribution unit 122, and the destination IP address that is the target of heterogeneous network distribution. information, and information on the route to the router that accommodates the terminal having the destination IP address that is the target of different network distribution.
  • the processing unit 226 processes the header of the packet acquired by the third acquisition unit 221b (S202). For example, the processing unit 226 removes the MPLS label from the header of the packet acquired by the third acquisition unit 221b.
  • the second determining unit 222b determines whether a predetermined protocol is used in the packet acquired by the third acquiring unit 221b (S203). For example, the second determining unit 222b determines whether GTP-U is used in the packet acquired by the third acquiring unit 221b. Further, for example, the second determining unit 222b determines whether the packet acquired by the third acquiring unit 221b includes a QinQ tag.
  • the second determining unit 223b determines the destination IP address of the packet acquired by the third acquiring unit 221b. It is determined whether the address matches the information regarding the communication route acquired by the third acquisition unit 221b (S204). For example, the second determining unit 223b uses the destination IP address of the packet determined by the second determining unit 222b as not containing a QinQ tag, and the different network allocation information acquired by the third acquiring unit 221b. It is determined whether or not the target destination IP address matches.
  • the second rewriting unit 224b converts the header of the packet into the header of the packet acquired by the third acquiring unit 221b. It is rewritten based on the information regarding the communication route (S205). For example, the second rewriting unit 224b transfers the header of the packet determined to be a match by the second determining unit 223b to the destination IP address network based on the information regarding the communication route acquired by the third acquiring unit 221b. Rewrite to appropriate tunnel header.
  • the second transmitting unit 227b transmits the packet whose header has been rewritten by the second rewriting unit 224b to the terminal (S206).
  • the second transmitting unit 227b of the first transfer device 200A transmits a packet whose header has been rewritten by the second rewriting unit 224b to a fixed terminal or a mobile terminal.
  • the second transmitting unit 227b of the second transfer device 200B transmits the packet whose header has been rewritten by the second rewriting unit 224b to a fixed terminal or a mobile terminal.
  • the communication system 1 includes a distribution device 100, a first transfer device 200A, and a second transfer device 200B
  • the distribution device 100 includes a first acquisition unit that acquires information regarding a communication route. 121, and a distribution unit 122 that transmits information regarding the communication route acquired by the first acquisition unit 121 to the first transfer device 200A and the second transfer device 200B
  • the second transfer device 200B includes a second acquisition unit 221a that acquires packets and information regarding the communication route distributed by the distribution unit 122, and a destination IP address of the packet acquired by the second acquisition unit 221a.
  • the first determination unit 223a determines whether or not the information regarding the communication route acquired by the second acquisition unit 221a matches, and if the first determination unit 223a determines that they match, the second A first rewriting unit 224a rewrites the header of the packet acquired by the acquisition unit 221a based on the information regarding the communication route acquired by the second acquisition unit 221a, and a header rewritten by the first rewriting unit 224a. It has a first transmitter 227a that transmits a packet to a first transfer device 200A or a second transfer device 200B existing in a different VPN.
  • the first transfer device 200A and the second transfer device 200B of the communication system 1 receive information regarding the communication route acquired by the second acquisition unit 221a and information about the communication path acquired by the first rewriting unit 224a.
  • a creation unit 225 creates information regarding the communication route based on the packet whose header has been rewritten, the packet transmitted by the first transmission unit 227a, and the information regarding the communication route distributed by the distribution unit 122.
  • a third acquisition unit 221b that acquires information regarding the communication route created by the third acquisition unit 225, a processing unit 226 that processes the header of the packet acquired by the third acquisition unit 221b, and a third acquisition unit 221b.
  • a second determining unit 223b determines whether the destination IP address of the acquired packet matches the communication route information acquired by the third acquiring unit 221b, and the second determining unit 223b determines whether the destination IP address of the acquired packet matches the information regarding the communication route acquired by the third acquiring unit 221b. If it is determined that this is the case, a second rewriting unit 224b that rewrites the header of the packet acquired by the third acquisition unit 221b based on the information regarding the communication route acquired by the third acquisition unit 221b; The second transmitter 227b transmits the packet whose header has been rewritten by the rewrite unit 224b to the terminal.
  • the communication system 1 transmits the packet to the destination terminal via the access network without passing through the core network/Internet network, thereby realizing delay suppression.
  • the first transfer device 200A and the second transfer device 200B included in the communication system 1 determine whether a predetermined protocol is used for the packet acquired by the second acquisition unit 221a. and a second determining unit 222b that determines whether or not a predetermined protocol is used in the packet acquired by the third acquiring unit 221b. If the first determining unit 222a determines that a predetermined protocol is being used, the first determining unit 223a transmits the destination IP address of the packet acquired by the second acquiring unit 221a and the second acquiring unit 223a.
  • the second determining unit 223b determines whether the information regarding the communication route obtained by the It is determined whether the destination IP address of the packet acquired by the third acquisition unit 221b matches the information regarding the communication route acquired by the third acquisition unit 221b.
  • the communication system 1 determines the presence or absence of a predetermined protocol, performs encap/decap, and eliminates protocol differences, thereby achieving suppressed delays and improved closure.
  • the second acquisition unit 221a or the third acquisition unit 221b acquires information that links the IP address of the mobile terminal and the GTP-U tunnel information as information regarding the communication route.
  • the communication system 1 acquires the fixed IP address of the mobile terminal and information on the protocol used for communication to the IP address, and enables the header to be rewritten in accordance with the communication protocol of the mobile terminal.
  • program Further, it is also possible to create a program in which the processing executed by the communication system 1 described in the above embodiment is written in a computer-executable language. In this case, when the computer executes the program, the same effects as in the above embodiment can be obtained. Furthermore, the same processing as in the above embodiments may be realized by recording such a program on a computer-readable recording medium and having the computer read and execute the program recorded on this recording medium.
  • FIG. 19 is a diagram showing a computer that executes the program.
  • the computer 1000 includes, for example, a memory 1010, a CPU 1020, a hard disk drive interface 1030, a disk drive interface 1040, a serial port interface 1050, a video adapter 1060, and a network interface 1070. However, each of these parts is connected by a bus 1080.
  • the memory 1010 includes a ROM (Read Only Memory) 1011 and a RAM 1012, as illustrated in FIG.
  • the ROM 1011 stores, for example, a boot program such as BIOS (Basic Input Output System).
  • BIOS Basic Input Output System
  • Hard disk drive interface 1030 is connected to hard disk drive 1090, as illustrated in FIG.
  • the disk drive interface 1040 is connected to the disk drive 1100, as illustrated in FIG.
  • a removable storage medium such as a magnetic disk or an optical disk is inserted into disk drive 1100.
  • the serial port interface 1050 is connected to, for example, a mouse 1110 and a keyboard 1120, as illustrated in FIG.
  • Video adapter 1060 is connected to display 1130, for example, as illustrated in FIG.
  • the hard disk drive 1090 stores, for example, an OS 1091, an application program 1092, a program module 1093, and program data 1094. That is, the above program is stored, for example, in the hard disk drive 1090 as a program module in which commands to be executed by the computer 1000 are written.
  • the various data described in the above embodiments are stored as program data in, for example, the memory 1010 or the hard disk drive 1090.
  • the CPU 1020 reads out the program module 1093 and program data 1094 stored in the memory 1010 and the hard disk drive 1090 to the RAM 1012 as necessary, and executes various processing procedures.
  • program module 1093 and program data 1094 related to the program are not limited to being stored in the hard disk drive 1090, but may be stored in a removable storage medium, for example, and read by the CPU 1020 via a disk drive or the like.
  • the program module 1093 and program data 1094 related to the program are stored in another computer connected via a network (LAN (Local Area Network), WAN (Wide Area Network), etc.), and are transmitted via the network interface 1070. It may be read by the CPU 1020.
  • LAN Local Area Network
  • WAN Wide Area Network
  • module, -er suffix, -or suffix can be read as unit, means, circuit, etc.
  • a communication module, a control module, and a storage module can be read as a communication unit, a control unit, and a storage unit, respectively.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un système de communication (1) qui comprend un dispositif de distribution (100), un premier dispositif de transfert (200A) et un deuxième dispositif de transfert (200B). Le dispositif de distribution (100) distribue des informations concernant un trajet de communication au premier dispositif de transfert (200A) et au deuxième dispositif de transfert (200B). Le premier dispositif de transfert (200A) et le deuxième dispositif de transfert (200B) utilisent les informations concernant le trajet de communication pour effectuer une encapsulation/décapsulation de paquets transmis à partir d'un terminal, et établissent une communication avec un terminal qui est une destination possible par le biais d'un premier dispositif de transfert (200A) ou d'un deuxième dispositif de transfert (200B) existant dans un VPN différent.
PCT/JP2022/031344 2022-08-19 2022-08-19 Système, procédé et programme de communication WO2024038578A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11284664A (ja) * 1998-03-27 1999-10-15 Nec Corp 仮想専用網構築システム
JP2004165970A (ja) * 2002-11-13 2004-06-10 Nippon Telegr & Teleph Corp <Ntt> 動的経路制御方法および動的経路制御装置
JP2005057693A (ja) * 2003-08-07 2005-03-03 Nippon Telegr & Teleph Corp <Ntt> ネットワーク仮想化システム
JP2008172816A (ja) * 2008-02-15 2008-07-24 Hitachi Ltd アドレス変換方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11284664A (ja) * 1998-03-27 1999-10-15 Nec Corp 仮想専用網構築システム
JP2004165970A (ja) * 2002-11-13 2004-06-10 Nippon Telegr & Teleph Corp <Ntt> 動的経路制御方法および動的経路制御装置
JP2005057693A (ja) * 2003-08-07 2005-03-03 Nippon Telegr & Teleph Corp <Ntt> ネットワーク仮想化システム
JP2008172816A (ja) * 2008-02-15 2008-07-24 Hitachi Ltd アドレス変換方法

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SHIGEKI YAMANO, JUN IWATA, HIDEAKI TANI: "Scalable QoS guaranteed VPN scheme based on MPOA", IEICE TECHNICAL REPORT, IN, IEICE, JP, vol. 98, no. 670 (IN98-196), 12 March 1999 (1999-03-12), JP, pages 75 - 80, XP009553076 *

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