WO2012083657A1 - Procédé et système de traitement de paquets et équipement des locaux d'abonné - Google Patents

Procédé et système de traitement de paquets et équipement des locaux d'abonné Download PDF

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Publication number
WO2012083657A1
WO2012083657A1 PCT/CN2011/076120 CN2011076120W WO2012083657A1 WO 2012083657 A1 WO2012083657 A1 WO 2012083657A1 CN 2011076120 W CN2011076120 W CN 2011076120W WO 2012083657 A1 WO2012083657 A1 WO 2012083657A1
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WO
WIPO (PCT)
Prior art keywords
packet
address
cgn
cpe
tunnel
Prior art date
Application number
PCT/CN2011/076120
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English (en)
Chinese (zh)
Inventor
魏志峰
Original Assignee
刘建
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 刘建 filed Critical 刘建
Publication of WO2012083657A1 publication Critical patent/WO2012083657A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803—Home automation networks
    • H04L12/2807—Exchanging configuration information on appliance services in a home automation network
    • H04L12/2812—Exchanging configuration information on appliance services in a home automation network describing content present in a home automation network, e.g. audio video content
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803—Home automation networks
    • H04L2012/2847—Home automation networks characterised by the type of home appliance used
    • H04L2012/2849—Audio/video appliances

Definitions

  • the present invention relates to communication technologies, and in particular, to a message processing method, system, and user front end device. Background technique
  • the improved network address translation (NAT) 444 is a NAT that deploys IPv4->IPv4 on the carrier side.
  • Dual-Stack Lite is mainly used for network access. It involves network layer and transport layer protocol functions. It temporarily separates IPv6 deployment at the network level from IPv6 deployment at the user level and service level. Therefore, at the network level, the problem of IPv4 address exhaustion faced by operators is concentrated, and IPv6 deployment is promoted.
  • DS-Lite is a combination of "tunneling technology (IPv4 in IPv6 tunnel)" and "improved network address translation (NAT) technology”. It implements IPv4 private network addresses for users on the local area network (LAN) side, and through IPv6 tunnels and bearer-level network devices.
  • Double conversion of NAT on (Carrier-Grade NAT, CGN) completes access to wide area network (WAN) side (IPv4) resources.
  • WAN wide area network
  • IPv4 Internet Protocol
  • the main meaning of the IPv6 network connection is to provide "the tunnel of the IPv4 user to its gateway" and assist in the completion of IPv4 address sharing (Tunnel-ID based v4 NAT). But with the support side of IPv6 on the user side and the server side Gradually popular and mature, it can ensure the smooth transition of the network to IPv6.
  • the DS-Lite solution does not include the translation interworking mechanism between IPv4 and IPv6, because the access of the node to the IPv4 network and applications will be through IPv4, and the access to the IPv6 network services and applications will be through IPv6; Interworking between an IPv4 network and a WAN-side IPv4 network.
  • the present invention provides a packet processing method, system, and user front-end device to implement interworking between a LAN-side IPv4 network and a WAN-side IPv4 network.
  • the present invention provides a message processing method, which includes:
  • the user front end device obtains the tunnel endpoint address and uses a lightweight dual stack (DS-Lite) to establish a tunnel;
  • the first packet in the uplink of the local area network (LAN) device is encapsulated into a second packet, and forwarded to the bearer-level network device (CGN) through the tunnel;
  • CGN bearer-level network device
  • the above processing method can have the following characteristics:
  • the step of the CPE acquiring the tunnel endpoint address includes:
  • the CPE obtains the tunnel endpoint address through the Dynamic Host Setup Protocol (DHCP) option.
  • DHCP Dynamic Host Setup Protocol
  • the above processing method can also have the following features:
  • the method further includes:
  • the CGN decapsulates the received second packet into a first packet, and forwards the packet to a wide area network (WAN) side device.
  • WAN wide area network
  • the above processing method can also have the following features:
  • the CGN updates the address information in the address mapping table according to the first packet, and the address information packet Contains the translated source address and the unconverted destination address.
  • the above processing method can also have the following features:
  • the method further includes:
  • the CGN When the CGN receives the first packet returned by the WAN device, the CGN learns the address to be forwarded according to the address mapping table, and encapsulates the first packet into a second packet, and forwards the packet to the CPE, where the CPE performs the The second packet is decapsulated into a first packet and forwarded to the LAN device corresponding to the address.
  • the present invention also provides a user front end device (CPE), the CPE comprising:
  • Establish a module which is set to: obtain a tunnel endpoint address, and establish a tunnel by using a lightweight dual stack (DS-Lite);
  • a packet forwarding module configured to: encapsulate the first packet of the uplink of the local area network (LAN) device into a second packet, and forward the packet to the bearer-level network device (CGN) through the tunnel;
  • a decapsulation and forwarding module configured to: receive the second packet sent by the CGN through the tunnel, decapsulate the second packet into a first packet, and forward the packet to the LAN device.
  • the above CPE can have the following characteristics:
  • the CPE is set to: Obtain a tunnel endpoint address through the Dynamic Host Setup Protocol (DHCP) option.
  • DHCP Dynamic Host Setup Protocol
  • the present invention also provides a packet processing system including the above CPE and bearer level network equipment (CGN), wherein:
  • the bearer-level network device is configured to: after receiving the second packet forwarded by the CPE, decapsulate the second packet into a first packet, and forward the packet to a wide area network (WAN) side device. .
  • the above processing system can have the following characteristics:
  • the CGN is configured to: in the process of decapsulating the second packet into the first packet, and forwarding the packet to the wide area network (WAN) device, updating the address mapping table according to the first packet Address information, the address information includes the converted source address and the unconverted destination address.
  • WAN wide area network
  • the above processing system can also have the following features:
  • the CGN is further configured to: when receiving the first message returned by the WAN side device, according to The address mapping table learns the address to be forwarded, and encapsulates the first packet into a second packet and forwards the packet to the CPE, and then the CPE decapsulates the second packet into the first packet and forwards the packet to the address.
  • Corresponding LAN side device when receiving the first message returned by the WAN side device, according to The address mapping table learns the address to be forwarded, and encapsulates the first packet into a second packet and forwards the packet to the CPE, and then the CPE decapsulates the second packet into the first packet and forwards the packet to the address.
  • the above-mentioned four-dimensional processing method, system and user front-end device can realize interworking between two networks.
  • FIG. 1 is a flowchart of a packet processing method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a network networking according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a logical structure of an embodiment of a tunnel according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a packet forwarding path according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a CPE according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a message processing system according to an embodiment of the present invention.
  • FIG. 1 it is a flowchart of a packet processing method according to the present invention. The method is described from a CPE side, and the method includes:
  • Step 101 The user front-end device (CPE) obtains the tunnel endpoint address, and uses DS-Lite to establish a tunnel.
  • CPE user front-end device
  • the CPE can obtain the tunnel endpoint address through the Dynamic Host Configuration Protocol (DHCP) option to establish a tunnel such as an IPv4 in IPv6 tunnel.
  • DHCP Dynamic Host Configuration Protocol
  • Step 102 The first packet sent by the local area network (LAN) device is encapsulated into a second packet, and forwarded to the bearer-level network device (CGN) through the tunnel.
  • LAN local area network
  • CGN bearer-level network device
  • the first packet may be an IPv4 packet
  • the second packet may be an IPv6 packet.
  • the first packet and the second packet may be other types of packets, where the IPv4 packet is used.
  • IPv6 is only an example;
  • the method further includes: the CGN decapsulating the received second packet into a first packet, and forwarding the packet to the wide area network (WAN) side device; where, the CGN pairs the received second packet solution
  • the CGN updates the address information in the address mapping table according to the first packet, where the address information includes the converted source address and the untransformed destination address.
  • the CGN receives the first packet returned by the WAN device, the IP address is obtained according to the address mapping table, and the first packet is encapsulated into a second packet and forwarded to the CPE;
  • the LAN side device may be an IPv4 host that uses a private network address, and accesses an external IPv4 network through an IPv6 network composed of a CPE and a DS-Lite device.
  • Step 103 Receive a second packet sent by the CGN through the tunnel, and decapsulate the second packet into a first packet, and forward the packet to the LAN device.
  • the packet processing method establishes a tunnel between the DS-Lite and the CGN on the CPE terminal device, so that two networks, such as an IPv4 network, can communicate with each other, and an IPv6 network exists between the two IPv4 networks.
  • FIG. 2 it is a schematic diagram of a network networking of the present invention, where the network networking includes a LAN side PC.
  • the IPV6 packet includes the general IPV6 packet and the IPV4-IN-IPV6 packet.
  • the CGN in addition to being responsible for tunneling with the CPE, the CGN also has a NAT function to implement mutual conversion of the IP V4 private network address to the public network address, thereby realizing access to the WAN-side IPV4 resource.
  • an address mapping table is maintained on the CGN, and the records in the address mapping table are generated by the data flow message information (the mapping record is deleted after the address aging).
  • the CGN translates the source address in the packet sent by the CPE, and the destination address is still the public network address, and the packet is sent.
  • the IPv4 public network returns the data packet, the IPv4 public network can find the private network address to be forwarded by searching the table, and Forward the message to the CPE.
  • FIG. 3 it is a schematic diagram of a logical structure of an embodiment of a tunnel according to the present invention.
  • the tunnel logically includes two endpoints, each of which may correspond to a network device, and at the A end, the interface to the IPv4-in-IPv6 tunnel Tunl46
  • the IPv4 packet is encapsulated and sent to the B-end.
  • the IPv6 header of the received IPv4-in IPv6 packet is stripped and converted to an IPv4 packet for further forwarding.
  • the functions of the two ends of the tunnel are symmetrical. At both ends of A and B, IPV6-based communication is used.
  • A When A sends a packet to B, it knows at least the local address and the peer address of the tunnel, which are used as the source address and destination address of the IPV6 header respectively.
  • the CPE implements a tunnel processing module (Tunl46) 31 functional entity in the kernel part.
  • the configuration management module 41 configures related information provided on the visual interface or remote management to the WAN connection processing module 42; the WAN connection processing module 42 creates a virtual device nbif and Creating routing information into the routing table, the tunnel configuration management module 43 obtains tunnel related information from the WAN connection processing module 42 and configures the information to the tunnel processing module 44, and then the tunnel processing module 44 establishes a tunnel based on the information; the DNS processing module 45 has a DNS The Proxy function, according to the configuration, sends the LAN-side IPV4 DNS request to the IPV6 DNS on the WAN connection from the designated or default IPV6 WAN connection, and returns the corresponding DNS response message to the LAN-side device;
  • the packet forwarding path is as follows:
  • the LAN destination host (HOST) uplink destination IP address is the public network IP IPv4 packet: from the LAN side host host to ethx, from ethx to brO, then to the tunnel Tunl46, and then to nbif (tunl46 to nbif forwarding) Can be implemented according to the configuration of IPv6 routing), from nbif to CGN;
  • the CPE local application generates an IPv4 packet whose destination IP address is the public network IP address:
  • the local application APP routes to the tunnel Tunl46, and then to nbif, from nbif to CGN;
  • the CPE local application generates, the destination address global (Global) IPv6 IPv6 text: the local application APP routes to nbif, and then nbif to CGN;
  • the WAN-side downlink IPv4 destination is not an IPv4-in-IPv6 tunnel message of the CPE local address:
  • the tunnel protocol receives the packet and transfers it to the tunnel Tunl46, which is routed from v4 to brO, then from brO to ethx, and finally from ethx to the LAN side host. After the tunnel packet is unblocked by the tunel46, the tunnel packet is routed to the brO through the IPv4 protocol stack and then forwarded through the bridge.
  • the WAN-side downlink IPv4 destination is an IPv4-in-IPv6 tunnel packet of the CPE local address: from CGN to nbif, the tunneling protocol receives the packet to the tunnel Tunl46, and then tunnels to the IPv4 protocol stack, and then to the local application;
  • IPv6 packets in the LAN side uplink or WAN side downlink are also IPv6 packets in the LAN side uplink or WAN side downlink.
  • FIG. 5 it is a schematic structural diagram of a CPE according to the present invention.
  • the CPE includes: an establishing module 51, a package forwarding module 52, and a decapsulation forwarding module 53.
  • the establishing module 51 is configured to obtain a tunnel endpoint address and use a lightweight The dual-stack (DS-Lite) establishes a tunnel;
  • the encapsulation and forwarding module 52 is configured to encapsulate the first packet of the uplink of the local area network (LAN) device into a second packet, and forward the packet to the bearer-level network device (CGN) through the tunnel.
  • the decapsulation and forwarding module 53 is configured to receive the second packet sent by the CGN through the tunnel, and decapsulate the second packet into the first packet, and forward the packet to the LAN device.
  • the CPE can be used to obtain a tunnel endpoint address through a Dynamic Host Setup Protocol (DHCP) option.
  • DHCP Dynamic Host Setup Protocol
  • the CPE can have the following functions:
  • the CPE can assign an IPv4 private network address (192.xxx) to the LAN device, and assign a gateway and a domain name server (DNS) address to it, and the default is a CPE LAN side address, such as 192.168.1.1; Supports IPv4 and IPv6 dual stacks, and obtains IPv6 global addresses and corresponding gateways, DNS addresses, etc. from the WAN side through Ethernet-based Point-to-Point Protocol (PPPoE) or Ethernet-based Internet Protocol (IPoE);
  • PPPoE Point-to-Point Protocol
  • IPoE Ethernet-based Internet Protocol
  • CPE support An IPv4-in-IPv6 tunnel is set up to establish an IPv6 tunnel with the CGN. The IPv4 packet is forwarded to the CGN and then forwarded to the CGN.
  • the packet is forwarded to the LAN.
  • the side device the CPE has a DNS proxy function, and sends the LAN side IPv4 DNS request from the specified or default IPv6 WAN connection to the IPv6 DNS on the WAN connection according to the configuration, and returns the corresponding DNS response message.
  • CPE also has a specific DHCPV6 option (options) to get and receive specific configuration information from the WAN side (eg tunnel related information, V4 DNS) feature.
  • the CPE of the present invention uses the DHCP V6 Options to obtain the AFTR address, and then establishes a tunnel, which improves the flexibility of the actual use of the system.
  • FIG. 6 is a schematic structural diagram of a 3 ⁇ 4 text processing system according to the present invention.
  • the system includes: a CPE 61 and a bearer level network device (CGN) 62, wherein the structure of the CPE 61 is as shown in FIG. The same function has the same function and is not described here.
  • the bearer-level network device (CGN) 62 is configured to decapsulate the second packet after receiving the second packet forwarded by the CPE 61. It is the first packet and forwarded to the wide area network (WAN) side device.
  • WAN wide area network
  • the CGN 62 may be configured to update the address mapping table according to the first packet in the process of encapsulating the second packet into the text and forwarding to the wide area network (WAN) side device.
  • Address information in the address information including the converted source address and the unconverted destination address.
  • the CGN 62 is further configured to: when receiving the first packet returned by the WAN side device, learn the address to be forwarded according to the address mapping table, and encapsulate the first packet into the second packet to be forwarded to the second packet.
  • the CPE 61 the CPE 61 decapsulates the second packet into a first packet and forwards the packet to the LAN device corresponding to the address.
  • the communication system through the interaction of CPE 61 and CGN 62, enables the two networks to communicate.
  • the " ⁇ processing method, system and user front-end device of the present invention can realize interworking between two networks.

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

Abstract

La présente invention se rapporte à un procédé et à un système de traitement de paquets. L'invention se rapporte d'autre part à un équipement des locaux d'abonné. Le procédé selon l'invention comprend les étapes suivantes : un équipement des locaux d'abonné (CPE, Customer Premises Equipment) obtient une adresse d'un point d'extrémité de tunnel et établit un tunnel au moyen du Dual-Stack Lite (DS-Lite) ; des premiers paquets, situés en amont par rapport à un équipement sur le côté réseau local (LAN, Local Area Network), sont encapsulés de sorte à obtenir des seconds paquets, et transférés à un dispositif Carrier Grade NAT (CGN, Carrier Grade Network) via le tunnel ; les seconds paquets envoyés par le CGN via le tunnel sont reçus, désencapsulés de sorte à obtenir à nouveau les premiers paquets, et transférés à l'équipement sur le côté LAN.
PCT/CN2011/076120 2010-12-20 2011-06-22 Procédé et système de traitement de paquets et équipement des locaux d'abonné WO2012083657A1 (fr)

Applications Claiming Priority (2)

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CN201010595585.8 2010-12-20
CN2010105955858A CN102546362A (zh) 2010-12-20 2010-12-20 报文处理方法、系统和用户前端设备

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CN102938736B (zh) * 2012-11-20 2016-06-08 杭州迪普科技有限公司 一种实现IPv4报文穿越IPv6网络的方法和设备
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CN104993993B (zh) * 2015-05-13 2018-06-15 华为技术有限公司 一种报文处理方法、设备和系统
CN105391639B (zh) * 2015-10-13 2019-05-03 深圳市唯传科技有限公司 一种物联网智能网关路由方法及系统
CN105939316A (zh) * 2015-10-26 2016-09-14 杭州迪普科技有限公司 报文转发方法以及装置
CN109151084A (zh) * 2017-06-15 2019-01-04 中兴通讯股份有限公司 报文发送方法及装置、系统、cgn设备
CN111371909B (zh) * 2018-12-25 2022-04-26 深圳市中兴微电子技术有限公司 实现4in6 DS Lite数据流转发方法、系统
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