WO2020132982A1

WO2020132982A1 - Data transmission method and routing device

Info

Publication number: WO2020132982A1
Application number: PCT/CN2018/124028
Authority: WO
Inventors: 毛方竹; 代雯蕾; 李成刚; 任斌; 胡海涛
Original assignee: 华为技术有限公司
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-07-02

Abstract

A data transmission method and a routing device. The method is applied to a first routing device that supports IPv4 and IPv6 protocol stacks and is located at one end of a lightweight dual-stack (DS-lite) IPv4-in-IPv6 tunnel. The method comprises: a first routing device detecting whether an IPv4 link and an IPv6 link are available; and the first routing device using the configured IPv4-IPv6 dual-stack method to transmit data for a terminal device when both the IPv4 link and the IPv6 link are available, and using the configured DS-lite method to transmit data for the terminal device when the IPv4 link is unavailable but the IPv6 link is available. Thus, the data transmission method is flexibly selected according to network connection and disconnection conditions, and the flexibility of communication is improved.

Description

Data transmission method and routing equipment

Technical field

This application relates to the field of communication technology, and in particular, to a data transmission method and a routing device.

Background technique

Currently, during the evolution of the Internet Protocol version 4 (internet protocol version4, IPv4) to the Internet Protocol version 6 (internet protocol version6, IPv6), IPv4 networks coexist with IPv6 networks, and routing devices use IPv6 links to forward data packets Two methods are available: IPv4-IPv6 dual stack and lightweight dual-stack (dual-stack lite, DS-lite). IPv4-IPv6 dual stack means that the routing device forwards the data packets of the terminal device related to the IPv4 service through the IPv4 link, and forwards the data packets of the terminal device related to the IPv6 service through the IPv6 link. DS-lite refers to the IPv4-in-IPv6 tunnel deployed in an IPv6 network to transmit data messages related to IPv4 services of terminal devices, while the data messages related to IPv6 services of terminal devices are the same as IPv4-IPv6 dual stack, direct Forwarding via IPv6 link.

In the prior art, the routing device on the user side usually only supports one of the data transmission methods. When the currently used data transmission method is found to be unavailable, the routing device needs to reconfigure the other data transmission method, which may cause The business of the terminal equipment is interrupted, so the flexibility of communication is poor.

Summary of the invention

The embodiments of the present application provide a data transmission method and a routing device to improve the flexibility of communication.

In a first aspect, an embodiment of the present application provides a data transmission method, including: a first routing device detects whether an IPv4 link and an IPv6 link are available, and the first routing device supports IPv4 and IPv6 protocol stacks and is located at a lightweight A routing device at one end of an IPv4-in-IPv6 tunnel in a dual-stack DS-lite network; the first routing device uses the configured IPv4-IPv6 dual-stack network when both the IPv4 link and the IPv6 link are available The terminal device transmits data, and when the IPv4 link is unavailable and the IPv6 link is available, the configured DS-lite network is used to transmit data for the terminal device.

Using the technical solution in the embodiments of the present application, the first routing device can flexibly select a feasible data transmission method from IPv4-IPv6 dual stack and DS-lite according to the availability of IPv4 links and IPv6 links to transmit data for the terminal device In order to make full use of network resources and improve the flexibility of communication.

In a possible design, before the routing device detects whether an IPv4 link and an IPv6 link are available, the method further includes: the first routing device obtains its own IPv4 address, IPv6 address, and the second routing device's IPv6 address, the second routing device is a routing device located at the opposite end of the IPv4-in-IPv6 tunnel in the DS-lite network; the first routing device is based on the IPv4 address, the IPv6 address and the second The IP address of the routing device is configured with the IPv4-IPv6 dual-stack network and the DS-lite network.

Further, since the first routing device obtains its own IPv4 address, IPv6 address and other network configuration information before the availability of the IPv4 link and the IPv6 link, the two data transmissions of IPv4-IPv6 dual stack and DS-lite are transmitted in advance The method is configured, so that when the subsequent first routing device detects that the availability of the IPv4 link and the IPv6 link changes, the first routing device can automatically switch between the IPv4-IPv6 dual stack and DS-lite. The data transmission path can be reached without modifying the configuration, which can effectively improve the switching efficiency and the flexibility of communication.

In a possible design, the first routing device detects whether an IPv4 link and an IPv6 link are available, including: the first routing device uses the IPv4 link to the first server corresponding to the first set domain name Sending a first detection message, if the first response message returned by the first server is received, it is determined that the IPv4 link is available, otherwise it is not available; the first routing device uses the IPv6 link to send The second routing device or the server corresponding to the second set domain name sends a second detection message, and if a second response message returned by the second routing device or the second server is received, the IPv6 chain is determined Road is available, otherwise it is not available.

In a possible design, if the first routing device uses the configured DS-lite network to transmit data for the terminal device, the method further includes: the first routing device detects that an IPv4 link is available, And when the packet-free delay in the IPv4 link is less than or equal to the first threshold, and the data flow of the terminal device within the set time period is less than or equal to the second threshold, the IPv4-IPv6 dual-stack network is switched to Transmitting data for the terminal device.

In the embodiment of the present application, the first routing device considers the service continuity of the data transmission of the terminal device, and can choose to restart the DS-lite when the IPv4 link returns to normal and remains stable, and the service of the terminal device is idle. Switch to IPv4-IPv6 dual stack, so as to avoid the impact of the switching process on the services that affect the terminal equipment and effectively improve the user experience.

In a second aspect, an embodiment of the present application provides a routing device having the function of implementing the first routing device in the first aspect or any possible design of the first aspect, which can be implemented by hardware, It can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the routing device includes a processing module and a communication module, and the processing module is configured to support the routing device to perform the corresponding first aspect or any of the designs in the first aspect Features. The communication module is used to support communication between the routing device and other communication devices (such as terminal devices). The routing device may further include a storage module, which is coupled to the processing module, and stores necessary program instructions and data of the routing device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory.

In a third aspect, an embodiment of the present application provides a chip that is coupled to a memory and used to read and execute a software program stored in the memory to implement any of the possible designs in the first aspect above method.

According to a fourth aspect, an embodiment of the present application provides a computer-readable storage medium that stores computer-readable instructions, and when the computer reads and executes the computer-readable instructions, causes the computer to execute the first Any possible design approach in the aspect.

According to a fifth aspect, an embodiment of the present application provides a computer program product that, when the computer reads and executes the computer program product, causes the computer to execute any method in any possible design of the first aspect described above.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a network architecture of a communication system to which embodiments of the application are applicable;

2 is a schematic diagram of data transmission under an IPv4-IPv6 dual stack in an embodiment of the present application;

3 is a schematic diagram of data transmission under DS-lite in an embodiment of the present application;

4 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

FIG. 5 is a schematic flow chart of a first routing device acquiring an IPv4 address, an IPv6 address, and an IP address of a second routing device in an embodiment of this application;

6 is a schematic structural diagram of a routing device provided in an embodiment of this application;

7 is another schematic structural diagram of a routing device provided in an embodiment of this application.

detailed description

In order to make the purpose, technical solutions and advantages of the present application clearer, the following describes the embodiments of the present application in detail with reference to the accompanying drawings of the specification. It should be noted that the terms used in the implementation part of the present application are only used to explain specific examples of the present application, and are not intended to limit the present application.

In the following description, unless otherwise stated, ordinal numbers such as “first” and “second” are only used to distinguish the description and cannot be understood as indicating or implying relative importance, or as indicating or Implied order.

FIG. 1 exemplarily shows a network architecture of a communication system to which embodiments of the present application are applicable. As shown in FIG. 1, the communication system includes a terminal device 101, a first routing device 102, and a second routing device 103. Further, the communication system may further include a dynamic host configuration protocol (IPv4, DHCPv4) server under IPv4 for configuring the public network IPv4 address of the first routing device.

The terminal device 101 refers to various electronic devices that need to access the Internet (referring to connection to the IPv6 public network or the IPv4 public network), for example, it can be a computer, notebook computer, smart phone, tablet computer, smart wearable device, or other devices It is other household equipment. The terminal device may be connected to the first routing device in a wired or wireless manner, and realize the communication with the IPv6 public network or the IPv4 public network through the routing forwarding function of the first routing device. Generally speaking, during the communication between the terminal device and the first routing device, the transmitted data message may be an IPv4 message or an IPv6 message. It should be noted that the communication system may include one or more terminal devices, and the embodiment of the present application does not specifically limit the number of terminal devices.

The first routing device 102 is a routing device supporting the IPv6 protocol stack and the IPv4 protocol stack. It includes a LAN port connected to the terminal device and a WAN port connected to the second routing device, and communicates with the terminal device through the LAN port accordingly To communicate with the second routing device through the WAN port. When multiple terminal devices are included in the communication system, the first routing device may be connected to each terminal device through different local area network ports.

In the embodiment of the present application, the first routing device may be used to centrally manage the terminal device, and it has the functions of DHCPv4 and DHCPv6. For example, after the first routing device is configured to obtain its own public network IPv4 address, each terminal device connected to it can be assigned a corresponding internal network IPv4 address, also known as a private network IPv4 address. For another example, after the first routing device is configured to obtain its own public network IPv6 address and IPv6 prefix information prefix, it can allocate IPv6 addresses to each connected terminal device through stateless automatic configuration of DHCPv6 or IPv6. In a possible design, the first routing device may serve as a server of the DHCPv6 protocol, provide DHCPv6 services, and allocate IPv6 addresses to the terminal device. In this case, the terminal device is a client client in the DHCPv6 protocol. In another possible design, the first routing device may allocate an IPv6 address prefix for stateless auto-configuration of IPv6 to the terminal device, so that the terminal device generates a random algorithm based on the IPv6 address prefix and its own interface information IPv6 address.

In a possible design, the first routing device may be various types of routing gateways located on the user side, such as customer premise equipment (CPE) or wireless access point (AP), Among them, CPE can also be called a home gateway. In another possible design, when the communication system shown in FIG. 1 is specifically an optical access network, the first routing device may also be an optical network terminal (optical network) shown in FIGS. 2 and 3. terminal (ONT) or optical network unit (ONU). Taking the first routing device as an ONT for example, in an optical access network, the ONT is often used in conjunction with an optical line terminal (OLT) to connect to the second routing device through the OLT.

The second routing device is a routing device located at the edge of the IPv4 and IPv6 backbone network. It has dynamic host configuration protocol under IPv6 (dynamic host configuration for IPv6, DHCPv6) and address family translation router (address family transition router, AFTR). Features. In the embodiment of the present application, that the second routing device has the DHCPv6 function means that the second routing device is equivalent to a DHCPv6 server and can allocate a public network IPv6 address to the first routing device. In this case, the second routing device is a DHCPv6 protocol. On the server side, the first routing device is a client client in the DHCPv6 protocol. In a possible design, the second routing device may be a broadband remote access server (broadband remote access server, BRAS) or an edge router (border router, BR).

In the embodiment of the present application, the first routing device also has the function of routing and forwarding, which can work in the data transmission mode (also called working mode) of IPv4-IPv6 dual stack, and can also work in the DS-lite Under data transmission mode.

In the following, for ease of understanding, the IPv4-IPv6 dual stack and the lightweight dual stack DS-lite involved in this application will be described in conjunction with FIGS. 2 and 3.

IPv4-IPv6 dual stack refers to enabling both IPv4 and IPv6 protocol stacks on one device. This device can communicate with both IPv4 devices and IPv6 devices. Of course, this requires that the device is configured with IPv4 and IPv6 WAN ports. The device communicates with the IPv4 device through the IPv4 WAN port and with the IPv6 device through the IPv6 WAN port.

When the first routing device works under the IPv4-IPv6 dual stack, it indicates that there is a dual-stack network between the first routing device and the second routing device, and the first routing device enables both the IPv4 protocol stack and the IPv6 protocol stack. As shown in FIG. 2, in the upstream direction, a forwarding path may be that the first routing device receives the IPv4 packet sent by the terminal device, performs network address translation (NAT) on the IPv4 packet, and the IPv4 The original source IP address in the packet is the private network IPv4 address of the terminal device. NAT translation refers to converting the source IP address of the IPv4 packet to the public network IPv4 address of the first routing device, and then sending the IPv4 packet. To the second routing device, and then sent to the IPv4 public network. Another forwarding path is that the first routing device receives the IPv6 packet sent by the terminal device, directly forwards the IPv6 packet to the second routing device, and then sends it to the IPv6 public network. This process does not require the IPv6 packet. NAT conversion. In the downstream direction, the forwarding of IPv4 and IPv6 packets is similar to the upstream direction, and will not be repeated here.

DS-lite is a kind of tunneling technology. By creating a tunnel in an IPv6 network, IPv4 packets can be sent to the IPv4 network through the IPv6 network, so that the terminal device can access the IPv4 public network through the IPv6 network, thereby realizing the IPv4 network. Interconnection.

The tunnel created in DS-lite is an IPv4in IPv6 tunnel, or it can also be called an IPv4over IPv6 tunnel. As shown in FIG. 3, the first routing device serves as a basic bridge bandwidth (B4) device in DS-lite, which is located at the end of the IPv4 in IPv6 tunnel near the user side, and the second routing device serves as DS-lite The AFTR device located at the other end of the IPv4in IPv6 tunnel near the network side is used to terminate the IPv4in IPv6 tunnel.

When the first routing device works under DS-lite, it indicates that the first routing device and the second routing device are IPv6 single-stack networks. As shown in FIG. 3, in the upstream direction, a forwarding path is that the first routing device receives the IPv6 packet sent by the terminal device, directly forwards the IPv6 packet to the second routing device through the IPv6 network, and the second routing device Send the IPv6 packet to the IPv6 public network. Similar to this in the downstream direction, both the first routing device and the second routing device perform direct forwarding without performing any NAT.

Another forwarding path is that, since IPv4 packets cannot be directly transmitted in the IPv6 network, the first routing device can use the DS-lite tunnel technology to create an IPv4in IPv6 tunnel in the IPv6 network. For the IPv4 packet received by the first routing device from the terminal device, the first routing device may encapsulate the IPv4 packet, and then send it to the second routing device through the created IPv4 in IPv6 tunnel. Here, the first routing device encapsulating the IPv4 packet specifically refers to: adding an IPv6 packet header to the IPv4 packet header, where the source IPv6 address in the IPv6 packet header is the first routing device (that is, B4 Device)'s public network IPv6 address, the destination IPv6 address is the IPv6 address of the second routing device (ie, AFTR device). In this way, after encapsulation, this message can be transmitted in the IPv6 network, thereby realizing the tunnel of "encapsulating IPv4 message in IPv6 message". Subsequently, after receiving the packet, the second routing device may strip off the IPv6 packet header in the packet to obtain the original IPv4 packet, that is, the IPv4 packet originally sent by the terminal device to the first routing device. The source IPv4 address in the header of the IPv4 packet is the IPv4 address of the terminal device itself, that is, the private network IPv4 address allocated by the first routing device to the terminal device, and the first routing device is forwarding the IPv4 report to the second routing device At the time of the text, the NAT of the private network IPv4 address is not converted. Therefore, after receiving the IPv4 packet, the second routing device first converts the private network IPv4 address and converts the source IPv4 address of the IPv4 packet It is the public network IPv4 address of the first routing device, and then sent to the IPv4 public network, so that the server receiving the IPv4 packet can normally receive and process the packet. Similar to this in the downstream direction, the second routing device is responsible for private network IPv4 NAT conversion and IPv4 packet encapsulation, and the first routing device is responsible for decapsulation of IPv4 packets and forwarding to the terminal device.

Based on the above network architecture, FIG. 4 exemplarily shows a data transmission method provided by an embodiment of the present application. As shown in FIG. 4, the method includes:

Step S401, a first routing device detects whether an IPv4 link and an IPv6 link are available. The first routing device is a routing device that supports IPv4 and IPv6 protocol stacks and is at the end of an IPv4in IPv6 tunnel of a lightweight dual-stack DS-lite.

Step S402, when both the IPv4 link and the IPv6 link are available, the first routing device uses the configured IPv4-IPv6 dual stack method to transmit data for the terminal device, and uses the configured when the IPv4 link is unavailable but the IPv6 link is available. DS-lite mode transmits data for terminal equipment.

In the embodiment of the present application, before step S401, the first routing device may obtain its own IPv4 address, IPv6 address, and IPv6 address of the second routing device. Here, the IPv4 address and the IPv6 address of the first routing device refer to, The public network IPv4 address and the public network IPv6 address assigned by the first routing device. Subsequently, the first routing device can configure the IPv4-IPv6 dual stack and DS-lite data transmission methods based on the obtained IPv4 address, IPv6 address, and the IPv6 address of the second routing device to establish IPv4-IPv6 dual stack and DS-lite. Lite IPv4in IPv6 tunnel.

Specifically, the first routing device acquiring its own IPv4 address, IPv6 address, and the IPv6 address of the second routing device may be implemented through the method flow shown in FIG. 5:

Step S501: The first routing device sends a DHCPv4 discovery discover message. After the standard process of DHCPv4, the first routing device receives the public network IPv4 address assigned by the DHCPv4 server.

Step S502: The first routing device sends a routing request (router solicitation, RS) message to request the second routing device to allocate an IPv6 address for it, and the IPv6 address of the domain name resolution system (DNS) server and other network configurations information.

Step S503, the first routing device receives a routing advertisement (RA) message sent by the second routing device, and triggers a standard DHCPv6 process to obtain an IPv6 address.

Step S504, the first routing device sends a DHCPv6 request solicit message to the second routing device, and carries an option64 field in the DHCPv6solicit message (the option64 is an option corresponding to AFTR in the RA message) to request the second routing device Returns the IPv6 address assigned to it and the domain name of AFTR.

Step S505, the first routing device receives a DHCPv6 announcement advertisement message sent by the second routing device, the DHCPv6 advertise message includes the IPv6 address assigned by the second routing device, and the network configuration such as the DNS server IPv6 address and AFTR domain name information.

Step S506: After determining that the IPv6 address given in the DHCPv6advertise message is available, the first routing device sends a DHCPv6 request message to the second routing device to request the second routing device to assign the IPv6 address to itself . Here, after receiving the DHCPv6advertise message, the first routing device can monitor the response of other devices to the DHCPv6advertise message. If no other device responds to the message, it means that the IPv6 address given in the message is not assigned to other devices. That is, the IPv6 address is available.

Step S507, the first routing device receives the DHCPv6 reply reply message sent by the second routing device, confirms that the above IPv6 address is assigned to itself, and completes the configuration of IPv4- and IPv6 dual stack according to the obtained own IPv4 address and IPv6 address .

Subsequently, the first routing device may send the domain name of the AFTR to the DNS server, so that the DNS server performs DNS resolution on the domain name of the AFTR to obtain the IPv6 address of the AFTR. The first routing device receives the IPv6 address of the AFTR sent by the DNS server, creates an IPv4-in-IPv6 tunnel to the second routing device (ie, AFTR) according to the AFTR's IPv6 address, and completes the DS-lite configuration.

It should be noted that, in the above steps S501 to S509, in order to improve the configuration efficiency, the first routing device may simultaneously send the DHCPv4discover message and the RS message. If the first routing device successfully obtains the IPv4 address, IPv6 address, and AFTR IPv6 address, the first routing device configures IPv4-IPv6 dual stack and DS-lite, otherwise, if the first routing device fails to obtain the IPv4 address, only the IPv6 address is obtained Address, the first routing device is only configured with DS-lite.

After the first routing device obtains the IPv4 address and the IPv6 address and completes the configuration of the IPv4-IPv6 dual stack and/or DS-lite, in step S401, the first routing device may send a detection message to the network side to Measure the connection and disconnection of IPv4 links and IPv6 links, that is, whether the link is normal and available. Wherein, the first routing device detecting whether the IPv4 link is available may be: the first routing device uses the IPv4 link to send the first detection message to the first server with the first set domain name in the IPv4 public network, when the set time When receiving the first response message returned by the first server within the interval, it is determined that the IPv4 link is available, otherwise it is determined that the IPv4 link is not available. In general, the unavailability of IPv4 links may include any of the following situations: 1) The IPv4 server fails; 2) During the evolution of the IPv4-IPv6 dual stack to a pure IPv6 network, the IPv4 server is deleted; 3 ) During the evolution of IPv4 single-stack networks to pure IPv6 networks, IPv4 servers were deleted.

Similarly, the first routing device detecting whether an IPv6 link is available may be: the first routing device uses the IPv6 link to send a second detection message to the second routing device or a second server with a second set domain name in the IPv6 public network When the second response message sent by the second routing device or the second server with the second set domain name is received within the set time interval, it is determined that the IPv6 link is available, otherwise it is determined that the IPv6 link is not available.

It should be noted that, during the process of detecting the IPv4 link and the IPv6 link, the first routing device may use the same set time interval or may be different, and the first set domain name and the 2. The set domain name may be the same set domain name or different set domain names, and this application does not make specific limitations.

In the embodiment of the present application, the first detection message is used to detect whether the IPv4 link is normal, the source address of the first detection message is the IPv4 address of the first routing device, and the destination address is the first set domain name in the IPv4 public network The IPv4 address of the corresponding first server. It can be a detection message based on the Internet Control Message Protocol (ICMP) protocol or an address resolution protocol (Address Resolution Protocol, ARP) protocol, such as an ICMP echo request message, corresponding, the first response The message is an ICMP echo reply message. In a possible design, the first detection message may be the first Internet packet explorer ping command or the first ARP ping command.

The second detection message is used to detect whether the IPv6 link is normal. The source address of the second detection message is the IPv6 address of the first routing device, and the destination address is the IPv6 address of the second routing device or the second device in the IPv6 public network. The IPv6 address of the second server corresponding to the given domain name. It can be based on the Internet Control Message Protocol (Internet Control Message Protocol for IPv6, ICMPv6) protocol under IPv6 or a probe message based on the Address Resolution Protocol (ARP) protocol, such as the ICMPv6 echo request message, corresponding The second detection message is an ICMPv6 reply message. In a possible design, the second detection message may be a second Internet packet explorer ping command or a second ARP ping command.

After the first routing device is configured with the IPv4-IPv6 dual stack and DS-lite data transmission methods, the first routing device can periodically detect whether the IPv4 link and the IPv6 link are available, and the detection period can be determined by those skilled in the art Flexible settings are made according to network requirements, and the embodiments of the present application are not specifically limited.

In step S402, when the first routing device detects that an IPv4 link is available and an IPv6 link is also available, the IPv4-IPv6 dual-stack mode may be used to transmit data for the terminal device. That is to say, in this scenario, the first routing device can work under the IPv4-IPv6 dual stack, transmit IPv4 packets of the terminal device through the IPv4 link, and transmit IPv6 packets of the terminal device through the IPv6 link. In this way, the network resources of the IPv4 link and the IPv6 link can be effectively used to improve the data transmission efficiency.

When the first routing device detects that the IPv4 link is unavailable but the IPv6 link is available, the DS-lite mode may be used to transmit data for the terminal device. That is to say, in this scenario, the first routing device can work in the DS-lite mode, directly transmit IPv6 packets of the terminal device through the IPv6 link, and encapsulate and decapsulate IPv4 packets in the created IPv4in IPv4 packets of terminal equipment are transmitted in the IPv6 tunnel. In this way, when the IPv4 link is unavailable due to a fault or other reasons, the IPv4 service of the terminal device can be normally performed.

In a specific application scenario, since the first routing device can periodically detect the connection and disconnection of the IPv4 link and the IPv6 link, if the first routing device previously detects that both the IPv4 link and the IPv6 link are available, and Use IPv4 and IPv6 to transmit data for the terminal device. If the first routing device detects that the IPv4 link is unavailable, but the IPv6 link is still normal, the first routing device can switch from IPv4-IPv6 dual-stack to DS- In the lite mode, the IPv4 data of the terminal device is transmitted through the DS-lite tunnel to avoid the interruption of the IPv4 service of the terminal device.

Conversely, if the first routing device previously detects that the IPv4 link is unavailable and the IPv6 link is available, and uses the DS-lite method to transmit data for the terminal device, if the first routing device detects that the IPv4 link returns to normal and the IPv6 chain When the path is normal, the first routing device may choose to switch from the DS-lite mode to the IPv4-IPv6 dual stack mode. This is because the use of IPv6 links to transmit IPv4 packets requires encapsulation and decapsulation of IPv4, and the encapsulated packets are transmitted through the created IPv4in IPv6 tunnel. This processing process has additional time and packet overhead. And it has a certain impact on the bandwidth of IPv6 links. Therefore, when the IPv4 link returns to normal, the first routing device uses the IPv4 link and the IPv6 link to transmit the IPv4 packet and the IPv6 packet of the terminal device, respectively, which can improve the network resource utilization efficiency and data transmission efficiency. Of course, the first routing device may also choose to continue to use the DS-lite method, which is not specifically limited in the embodiments of the present application.

In a possible implementation, considering the service continuity of the terminal device, the first routing device may set an anti-jitter mechanism for switching from DS-lite to IPv4-IPv6 to avoid switching to IPv4-IPv6 dual After the stack, the IPv4 link is unstable and cannot transmit data normally, and it needs to switch to DS-lite again. For example, the first routing device may choose to detect that an IPv4 link is available, and that the packet-free delay in the IPv4 link is less than or equal to the first threshold (such as 30ms), and the data traffic of the terminal device within the set duration is less than or equal to the first In the case of two thresholds (such as 100 kbps), the data transmission of the terminal device is switched to the IPv4-IPv6 dual stack. Here, the packet-free delay in the IPv4 link is less than or equal to the first threshold, indicating that the IPv4 link has returned to stability, and the data traffic of the terminal device within the set duration is less than or equal to the second threshold, indicating that the current service of the terminal device is in In the idle state, at this time, the first routing device disconnects the IPv4in IPv6 tunnel and switches the DS-lite to IPv4-IPv6 dual stack, which can avoid the impact of the switching process on the services that affect the terminal device and effectively improve the user experience. As another example, the anti-shake mechanism may also be to set a certain anti-shake time, that is, the first routing device may choose to detect that an IPv4 link is available, and after the set anti-shake time, perform DS-lite to IPv4 -IPv6 dual stack switching.

Using the technical solution in the embodiments of the present application, the first routing device can flexibly select a feasible data transmission method from IPv4-IPv6 dual stack and DS-lite according to the availability of IPv4 links and IPv6 links to transmit data for the terminal device In order to make full use of network resources and improve the flexibility of data transmission.

Based on the same inventive concept, an embodiment of the present application further provides a routing device, which is used to execute the method flow in the foregoing method embodiment. FIG. 6 is a schematic structural diagram of a routing device provided by an embodiment of the present application. As shown in FIG. 6, the routing device includes: a processing module 610 and a communication module 620.

The processing module 610 is used to detect whether the IPv4 link and the IPv6 link are available, and when both the IPv4 link and the IPv6 link are available, the configured IPv4-IPv6 dual-stack mode is used to transmit data to the terminal device through the communication module 620. When the IPv4 link is unavailable but the IPv6 link is available, the configured DS-lite mode is used to transmit data for the terminal device through the communication module 620; the communication module 620 is used for transmitting data for the terminal device. It should be understood that the processing module 610 in this embodiment of the present invention may be implemented by a processor or a processor-related circuit component, and the communication module 620 may be implemented by a transceiver or a transceiver-related circuit component.

FIG. 7 is another schematic structural diagram of a routing device provided in an embodiment of the present application. As shown in FIG. 7, the routing device 700 includes a processor 710, a memory 720, and a communication interface 730. Optionally, the routing device 700 further includes an input device 740, an output device 750, and a bus 760. The processor 710, the memory 720, the communication interface 730, the input device 740, and the output device 760 are connected to each other through a bus 750. The memory 720 stores instructions or programs, and the processor 710 is used to execute the instructions or programs stored in the memory 720. When the instruction or program stored in the memory 720 is executed, the processor 710 is used to perform the operation performed by the processing module 610 in the foregoing method embodiment, and the communication interface 730 is used to perform the operation performed by the communication module 620 in the foregoing embodiment.

It should be noted that the routing device 600 or 700 provided in this embodiment of the present application may correspond to the first routing device in the data transmission methods S401 to S402 provided in this embodiment of the present invention, and the operations of each module in the routing device 600 or 700 And/or functions are respectively for implementing the corresponding processes of the methods shown in FIG. 4 to FIG. 5, and for the sake of brevity, they are not repeated here.

It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits ( application, specific integrated circuit (ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electronically Erase programmable EPROM (EEPROM) or flash memory. The volatile memory may be a random access memory (random access memory, RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct RAMbus RAM, DR RAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) is integrated in the processor.

It should be noted that the memories described herein are intended to include, but are not limited to these and any other suitable types of memories.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above processes does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and inherent logic, and should not correspond to the embodiments of the present invention. The implementation process constitutes no limitation.

Persons of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A data transmission method, characterized in that it includes:

The first routing device detects whether an IPv4 link and an IPv6 link are available. The first routing device is a routing device that supports IPv4 and IPv6 protocol stacks and is located at one end of a lightweight dual-stack DS-lite IPv4 in IPv6 tunnel;

When the IPv4 link and the IPv6 link are both available, the first routing device uses the configured IPv4-IPv6 dual-stack method to transmit data for the terminal device, when the IPv4 link is unavailable but the IPv6 chain When the road is available, the configured DS-lite method is used to transmit data for the terminal device.
The method according to claim 1, wherein before the routing device detects whether an IPv4 link and an IPv6 link are available, the method further comprises:

The first routing device obtains its own IPv4 address, IPv6 address, and IPv6 address of a second routing device, and the second routing device is a routing device located at the opposite end of the IPv4-in-IPv6 tunnel of the DS-lite;

The first routing device configures the IPv4-IPv6 dual stack mode and the DS-lite mode according to the IPv4 address, the IPv6 address, and the IP address of the second routing device.
The method according to claim 2, wherein the first routing device detects whether an IPv4 link and an IPv6 link are available, including:

The first routing device uses the IPv4 link to send a first detection message to the first server corresponding to the first set domain name, and if the first response message returned by the first server is received, it is determined that the IPv4 link is available, otherwise it is not available;

The first routing device uses the IPv6 link to send a second detection message to the second routing device or the second server corresponding to the second set domain name, if the second routing device or the first The second response message returned by the second server determines that the IPv6 link is available, otherwise it is not available.
The method according to any one of claims 1 to 3, wherein if the first routing device uses the configured DS-lite method to transmit data for the terminal device, the method further includes:

The first routing device detects that an IPv4 link is available, and the packet-free delay in the IPv4 link is less than or equal to a first threshold, and the data traffic of the terminal device within a set duration is less than or equal to a second threshold At that time, switch to the configured IPv4-IPv6 dual-stack network to transmit data for the terminal device.
A routing device, characterized in that the routing device includes:

A processing module for detecting whether an IPv4 link and an IPv6 link are available. The first routing device is a route that supports IPv4 and IPv6 protocol stacks and is located at one end of an IPv4-in-IPv6 tunnel in a lightweight dual-stack DS-lite network equipment;

The communication module is configured to transmit data for the terminal device by using the configured IPv4-IPv6 dual stack method when the processing module detects that both the IPv4 link and the IPv6 link are available, and the processing module detects When the IPv4 link is unavailable and the IPv6 link is available, the configured DS-lite mode is used to transmit data for the terminal device.
The routing device according to claim 5, wherein the communication module is further configured to:

Acquiring its own IPv4 address, IPv6 address, and IP address of a second routing device, where the second routing device is a routing device located at the opposite end of the IPv4-in-IPv6 tunnel of the DS-lite;

The processing module is also used to:

Configure the IPv4-IPv6 dual stack mode and the DS-lite mode according to the IPv4 address, the IPv6 address, and the IP address of the second routing device.
The routing device according to claim 6, wherein the processing module is specifically configured to:

Send the first detection message to the first server corresponding to the first set domain name through the communication module using the IPv4 link, and if the communication module receives the first response message returned by the first server, Determine that the IPv4 link is available, otherwise it is not available;

Use the IPv6 link to send a second detection message to the second routing device or the second server corresponding to the second set domain name through the communication module, if the communication module receives the second routing device or The second response message returned by the second server determines that the IPv6 link is available, otherwise it is not available.
The routing device according to any one of claims 5 to 7, wherein if the first routing device uses the configured DS-lite method to transmit data for the terminal device, the processing module is further used to:

When it is detected that the IPv4 link is available, and the packet-free delay in the IPv4 link is less than or equal to the first threshold, and the data traffic of the terminal device within the set duration is less than or equal to the second threshold, switch to the configured The IPv4-IPv6 dual stack mode transmits data for the terminal device.
A routing device, characterized in that it includes at least one processor, and the at least one processor is coupled to at least one memory;

The at least one processor is configured to execute a computer program or instructions stored in the at least one memory, so that the routing device executes the method according to any one of claims 1 to 4.
A computer-readable storage medium, characterized in that a computer program or instruction is stored in the computer-readable storage medium, and when the computer reads and executes the computer program or instruction, the computer is executed as claimed in claims 1 to 4. The method as described in any one.