WO2019196853A1 - Procédé et appareil d'accélération de protocole tcp - Google Patents

Procédé et appareil d'accélération de protocole tcp Download PDF

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Publication number
WO2019196853A1
WO2019196853A1 PCT/CN2019/082000 CN2019082000W WO2019196853A1 WO 2019196853 A1 WO2019196853 A1 WO 2019196853A1 CN 2019082000 W CN2019082000 W CN 2019082000W WO 2019196853 A1 WO2019196853 A1 WO 2019196853A1
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network device
tcp
acceleration
double
ended
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PCT/CN2019/082000
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English (en)
Chinese (zh)
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栗明
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures

Definitions

  • the present application relates to the field of network technologies, and in particular, to a Transmission Control Protocol (TCP) acceleration method and apparatus.
  • TCP Transmission Control Protocol
  • TCP is a connection-oriented, reliable, byte stream-based transport layer communication protocol.
  • TCP acceleration is a technique used to increase the speed of TCP packets transmitted over the network.
  • TCP acceleration includes both double-ended TCP acceleration and single-ended TCP acceleration.
  • double-ended TCP acceleration TCP packets are processed by a proprietary algorithm. Therefore, both ends of the TCP connection need to be deployed, and single-ended TCP acceleration and standards are required.
  • the TCP protocol is compatible, so it only needs to be deployed on one side of the TCP connection, regardless of whether the peer is deployed or not.
  • each router In a network architecture such as an enterprise network or a campus network, multiple routers are usually included.
  • the developer will pre-plan the TCP acceleration mode of each data stream that needs to be transmitted in the network according to service requirements, that is, which data flows in the network are planned. Single-ended TCP acceleration is required, and which data streams require double-ended TCP acceleration.
  • the developer configures each router according to the planning result of each data stream. For example, when the data stream is planned to use double-ended TCP acceleration, the developer needs to determine the source router and destination router that transmit the data stream.
  • the source router is configured to forward the data stream generated by the source terminal to the destination router, where the destination router is configured to forward the data stream to the destination terminal.
  • the developer then configures the source and destination routers with a double-ended TCP acceleration algorithm to enable the source and destination routers to support dual-ended TCP acceleration.
  • the developer needs to determine the source router that transports the data stream and configure the source router with a single-ended TCP acceleration algorithm to enable the source router to support single-ended TCP acceleration.
  • the source router receives the TCP packet and performs TCP acceleration on the TCP packet according to its own TCP acceleration capability.
  • the TCP packet is sent to the destination router.
  • the destination router forwards the TCP packet to the destination terminal.
  • the present invention provides a TCP acceleration method and device, which can solve the technical problem that the TCP acceleration method that needs to manually deploy a router in the related art leads to low efficiency.
  • the technical solution is as follows:
  • the first aspect provides a TCP acceleration method, which is applied to a first network device, where the first network device supports double-ended TCP acceleration and single-ended TCP acceleration, and the method includes:
  • the second network device supports double-end TCP acceleration, performing double-ended TCP acceleration on the TCP packet sent to the second network device;
  • the second network device does not support double-end TCP acceleration, performing single-ended TCP acceleration on the TCP packet sent to the second network device.
  • the first network device performs TCP acceleration on the TCP packet according to the TCP acceleration capability of the second network device, and does not need to manually deploy the TCP acceleration mode of the first network device, thereby improving the efficiency of the TCP acceleration. Further, the method for ensuring the TCP acceleration of the packet by the first network device is matched with the TCP acceleration capability of the second network device, and the transmission failure is caused when the TCP packet is sent according to the TCP acceleration mode that is not supported by the second network device. .
  • the sending the double-end acceleration negotiation message to the second network device includes:
  • the first network device temporarily detects the TCP acceleration capability of the second network device before establishing a session with the second network device, and ensures that the obtained TCP acceleration capability of the second network device is strong in real-time and high in accuracy. Further, when the capability of the second network device is updated, the first network device may automatically detect its latest TCP acceleration capability, ensure that the TCP packet is sent to the second network device, and the latest TCP acceleration of the second network device. Capability matching makes the TCP acceleration process time-sensitive, and the developer does not need to reconfigure the first network device with the update of the second network device capability, which is highly efficient.
  • the determining, according to whether the first network device receives the double-end acceleration acknowledgement message, the transmission control protocol TCP acceleration capability of the second network device includes:
  • the first network device When the first network device receives the double-ended acceleration acknowledgement message, determining that the second network device supports double-ended TCP acceleration;
  • the first network device When the first network device receives the synchronization-acknowledgment (SYN-ACK) message, it is determined that the second network device does not support double-ended TCP acceleration.
  • SYN-ACK synchronization-acknowledgment
  • the second network device may respond to one of the two types of packets sent by the first network device according to the TCP acceleration capability of the first network device, and discard the other packet, and the first network device is either After receiving the double-ended acceleration acknowledgement packet, or receiving the SYN-ACK packet, the first network device only needs to distinguish whether the received double-ended acceleration acknowledgement packet or the SYN-ACK packet can determine the second network device. TCP acceleration capabilities.
  • the sending the double-end acceleration negotiation message to the second network device includes:
  • the first network device does not need to temporarily detect the TCP acceleration capability of the second network device when the session is established, which saves time and improves efficiency by pre-probing the TCP acceleration capability of the network device in the routing information.
  • the determining, according to whether the first network device receives the double-end acceleration acknowledgement message, the transmission control protocol TCP acceleration capability of the second network device includes:
  • the first network device When the first network device receives the double-ended acceleration acknowledgement message, determining that the second network device supports double-ended TCP acceleration;
  • the first network device does not receive the double-ended acceleration acknowledgement message, it is determined that the second network device does not support double-ended TCP acceleration.
  • the first network device when the first network device receives the double-ended acceleration acknowledgement message within a preset duration, it is determined that the second network device does not support double-ended TCP acceleration.
  • the first network device does not receive the double-ended acceleration acknowledgement message for the preset duration, it is determined that the second network device does not support double-ended TCP acceleration.
  • the first network device can start timing when transmitting the double-end acceleration negotiation packet, so as to record the length of time after the double-end acceleration negotiation message is sent, when the first network device receives the double-end acceleration within the preset time period.
  • the first network device determines that the second network device supports the double-end TCP acceleration. If the length of the elapsed time after the first network device sends the double-end acceleration negotiation packet exceeds the preset duration, the first network device still does not.
  • the first network device can determine that the second network device does not support double-ended TCP acceleration.
  • the method further includes:
  • the method further includes:
  • the first network device when the first network device receives the TCP packet, directly queries the correspondence between the second network device and the TCP acceleration capability, and obtains the TCP acceleration capability of the second network device, without temporarily setting up the session. Detection saves time and improves efficiency.
  • a TCP acceleration device is provided, which is applied to a first network device that supports double-ended TCP acceleration and single-ended TCP acceleration, and the device includes a plurality of functional modules to implement the first Aspects and TCP acceleration methods in any of the possible implementations of the first aspect.
  • a network device comprising a processor and a memory, the memory storing at least one instruction loaded by the processor and executed to implement the first aspect and the first
  • the TCP acceleration method any possible implementation of the TCP acceleration method.
  • a network device comprising a processor, a memory, and a TCP accelerator, wherein the memory stores at least one instruction, the instruction being loaded and executed by the processor to implement the first And a TCP acceleration method in any of the possible implementations of the first aspect, the TCP accelerator is configured to perform TCP acceleration on a TCP packet.
  • a fifth aspect provides a computer readable storage medium having stored therein at least one instruction loaded by a processor and executed to implement the first aspect and any one of the possible implementations of the first aspect
  • FIG. 1 is a schematic diagram of an implementation environment provided by this embodiment
  • FIG. 2 is a schematic structural diagram of a network device 200 according to this embodiment
  • FIG. 3 is a schematic structural diagram of a network device 300 according to this embodiment.
  • FIG. 5 is a flowchart of a TCP acceleration method according to this embodiment.
  • FIG. 6 is a schematic structural diagram of a TCP acceleration apparatus according to this embodiment.
  • Double-ended TCP acceleration also known as symmetric TCP acceleration, double-ended optimization, double-ended TCP acceleration, double-ended TCP optimization, or bilateral TCP acceleration.
  • the two-end TCP acceleration adopts a three-stage network architecture.
  • Two TCP proxy devices are deployed at both ends of the TCP connection, and two TCP proxy devices respectively proxy the two terminals for TCP packet transmission, thereby implementing end-to-end TCP.
  • the connection is divided into three parts: source terminal - TCP proxy device A - TCP proxy device B - destination terminal.
  • the TCP proxy device A and the TCP proxy device B can store the same acceleration algorithm in advance, and the TCP proxy device A and the TCP proxy device B can process the packet through the acceleration algorithm, and transmit the processed TCP packet, thereby speeding up The speed of message transmission.
  • the router at the exit of the subnet where the source terminal is located that is, the source router
  • the router that is the egress of the subnet where the destination terminal is located, that is, the destination router acts as the TCP proxy device B in the double-ended TCP acceleration.
  • the two routers forward the packets processed by the acceleration algorithm.
  • Single-ended TCP acceleration also known as Asymmetric TCP acceleration, single-ended optimization, single-ended TCP acceleration, single-ended TCP optimization, or unilateral TCP acceleration.
  • Single-ended TCP acceleration only needs to be deployed on one end of the TCP connection, usually by improving the congestion control algorithm of the TCP protocol.
  • TCP three-way handshake In the TCP protocol, two devices need to establish a TCP connection through a three-way handshake mechanism. For example, when device A wants to establish a connection with device B, device A sends a SYN message to device B, and device A enters the SYN_SENT state, waiting for device B to confirm, which is the first handshake. After receiving the SYN packet, Device B sends a SYN-ACK packet to Device A to respond to the SYN packet sent by Device A. At the same time, Device B enters the SYN_RECV state. This is the second handshake. After receiving the SYN-ACK packet from device B, device A sends an acknowledgement (ACK) packet to device B. This is the third handshake. After the three-way handshake, device A and device B establish a TCP connection and enter the TCP connection success state (established state). Then device A and device B can start transmitting TCP packets.
  • SYN SYN message
  • SYN_SENT the SY
  • FIG. 1 is a schematic diagram of an implementation environment provided by this embodiment, where the implementation environment includes a plurality of first terminals 101, a first network device 102, a second network device 103, and a plurality of second terminals 104.
  • the first network device 102 can be disposed on a plurality of first terminals 101, and the first network device 102 and the plurality of first terminals 101 can form a subnet.
  • the second network device 103 can be disposed on the plurality of second terminals 104, and the second network device 103 and the plurality of second terminals 104 can form another subnet.
  • the first network device 102 and the second network device 103 are located in different subnets, and the information between the first network device 102 and the second network device 103 can be exchanged through a Wide Area Network (WAN) or a private network.
  • WAN Wide Area Network
  • the WAN can be the Internet (Ethernet)
  • the private network can be a virtual private network (VPN).
  • the first network device 102 and the second network device 103 may each be a CPE (Customer Premises Equipment), such as a router, a switch, a firewall, or the like.
  • Each of the plurality of first terminals 101 and the plurality of second terminals 104 may be a personal computer, a notebook computer, a mobile phone, a tablet computer, a wearable device, or the like.
  • the first network device can simultaneously have two kinds of TCP acceleration capabilities: the capability of double-ended TCP acceleration and the capability of single-ended TCP acceleration.
  • the first network device may send the double-end acceleration negotiation packet to the second network device, and obtain the TCP acceleration capability of the second network device according to whether the double-end acceleration acknowledgement packet sent by the second network device is received, according to the second network device.
  • the TCP acceleration capability selects double-ended TCP acceleration or single-ended TCP acceleration for TCP packets, so that TCP acceleration can be performed dynamically and adaptively.
  • the first terminal in the session is the source terminal and the second terminal is the destination terminal
  • the first terminal of the subnet 1 wants to transmit the TCP packet to the second terminal of the subnet 2
  • the first terminal The TCP packet may be sent to the first network device.
  • the first network device receives the TCP packet
  • the second network device supports the double-end TCP acceleration
  • the first network device performs double-end TCP acceleration on the TCP packet, and then sends the packet.
  • the second network device does not support the double-end TCP acceleration
  • the first network device performs single-ended TCP acceleration on the TCP packet, and then sends the accelerated packet to the second network device, where the second network device can receive the accelerated TCP packet.
  • the TCP packet is sent to the second terminal.
  • This embodiment provides a network device that supports double-ended TCP acceleration and single-ended TCP acceleration.
  • the network device can implement TCP acceleration through software or hardware.
  • the structure of the network device may be as shown in the following FIG. 2 embodiment.
  • the structure of the network device may be as shown in the following FIG. 3 embodiment.
  • FIG. 2 is a schematic structural diagram of a network device 200 according to this embodiment.
  • the network device 200 includes a processor 201 and a memory 202.
  • the processor 201 is connected to a memory 202.
  • the memory 202 stores a program code.
  • the processor 201 is configured to invoke the program code to perform operations performed by the first network device in the following embodiments.
  • the TCP acceleration function of the network device 200 can be implemented by one or more virtual modules in the program code.
  • FIG. 3 is a schematic structural diagram of a network device 300 according to this embodiment.
  • the network device 300 includes a processor 301, a memory 302, and a TCP accelerator 303.
  • the processor 301 is associated with the memory 302 and the TCP accelerator 303, respectively.
  • the memory 302 stores program code
  • the processor 301 is configured to call the program code to perform TCP acceleration on the TCP message through the TCP accelerator 303, thereby performing operations performed by the first network device in the following embodiments.
  • the TCP acceleration function of the network device 300 can be implemented by the TCP accelerator 303, which can be provided as one chip.
  • the network device can obtain the TCP acceleration capability of the peer network device, and accelerate according to the TCP acceleration capability of the peer network device.
  • the method for obtaining the TCP acceleration capability of the peer network device may include detecting the TCP acceleration capability of the peer network device and querying the correspondence between the network device and the TCP acceleration capability.
  • Method 1 Detect the TCP acceleration capability of the peer network device.
  • the detection of the TCP acceleration capability of the peer network device may include sending a double-end acceleration negotiation packet and a SYN packet for detecting, transmitting a double-end acceleration negotiation packet, and performing timeout detection.
  • the TCP acceleration capability of the peer network device of the session may be temporarily detected during the establishment of the session, or at least one network device may be determined according to the routing information before the session, and the determined TCP acceleration capability of each network device may be detected. .
  • Manner 2 Query the correspondence between the network device and the TCP acceleration capability to obtain the TCP acceleration capability of the network device.
  • the TCP acceleration capability of the peer network device can be detected in advance, and the correspondence between the network device and the TCP acceleration capability is generated according to the detected TCP acceleration capability of each network device, so as to query the network device and the TCP acceleration when establishing the session.
  • the correspondence between the capabilities can obtain the TCP acceleration capability of the peer network device.
  • the technical process of the present application will be described in detail below through the embodiment of FIG. 4 and the embodiment of FIG. 5 respectively.
  • the TCP acceleration capability of the peer network device is obtained by using the mode 1 in the embodiment of FIG. 4, and the TCP acceleration capability of the peer network device is obtained by using the second method in the embodiment of FIG. 5 as an example.
  • the network device may temporarily detect the TCP acceleration capability of the peer network device when establishing a session with the peer network device, and dynamically select the TCP packet according to the TCP acceleration capability of the peer network device. End TCP acceleration or single-ended TCP acceleration.
  • the network device on the source terminal side in the session is referred to as the first network device
  • the network device on the destination terminal side is referred to as the second network device as an example.
  • FIG. 4 is a flowchart of a method for accelerating a TCP according to the embodiment. The method may be applied to the foregoing implementation environment.
  • the interaction entity of the embodiment includes a source terminal, a first network device, a second network device, and a destination terminal. Includes the following steps:
  • the source terminal sends a SYN packet.
  • the source terminal in the process of establishing a session between the source terminal and the destination terminal, the source terminal first performs a three-way handshake with the destination terminal, thereby establishing a TCP connection with the destination terminal, and then transmitting a TCP report to the destination terminal. Text. Therefore, in this step 401, the source terminal generates a SYN packet and sends a SYN packet, so that the first handshake is performed to establish a TCP connection with the destination terminal.
  • the SYN packet can carry the IP address of the destination terminal (that is, the destination IP address) and the port number of the destination terminal (that is, the destination port number).
  • the destination terminal can be indicated by the IP address and port number of the destination terminal.
  • the first network device receives the SYN packet.
  • the first network device has a function of a TCP proxy.
  • the first network device can receive the packet in the TCP protocol.
  • the TCP protocol packet includes a SYN packet in the handshake phase and a TCP packet in the session phase.
  • the implementation manner of the message for receiving the TCP protocol is exemplarily described in the following by (1) to (2):
  • the first network device can receive all the packets sent by the source terminal, parse all the packets, and filter the packets of the TCP packets from all the packets to accelerate the packets of the TCP protocol. Then forward the accelerated TCP packet.
  • the source terminal being proxied is unaware of the existence of the first network device, and thus the first network device is transparent to the source terminal.
  • the source terminal may pre-configure the address information of the first network device, and carry the address information of the first network device in the generated TCP protocol packet, and then send the TCP protocol packet to the first Internet equipment. After receiving the packet of the TCP protocol, the first network device accesses the destination terminal instead of the source terminal.
  • the address information of the first network device may be an IP address, a port number, or the like.
  • the SYN packet belongs to the TCP protocol packet.
  • the first network device can receive the SYN packet, and performs the following steps according to the SYN packet. 403.
  • the first network device determines the destination network device of the SYN packet, and obtains the second network device.
  • the first network device can parse the SYN packet, obtain the destination IP address carried in the SYN packet, and determine the destination network device corresponding to the destination IP address as the second network device.
  • the destination network device may be a network device that is in the same subnet as the IP address of the destination terminal, for example, a router that may be an egress of the subnet where the destination terminal is located.
  • the correspondence between the IP address and the network device may be established in advance, and the first network device may query the correspondence according to the IP address of the destination terminal to obtain the destination.
  • the network device corresponding to the terminal serves as the second network device.
  • the first network device may be a router that stores a routing table, and the correspondence between the IP address and the network device may be stored in the routing table.
  • the first network device detects a TCP acceleration capability of the second network device.
  • This step may specifically include the following steps 1 through 6:
  • Step 1 The first network device sends a double-ended acceleration negotiation message and a SYN message to the second network device.
  • the first network device can detect the TCP acceleration capability of the second network device by using the dual-neutral negotiation packet. That is, the first network device may generate a double-end acceleration negotiation message and a SYN message, and simultaneously send the two types of packets to the second network device, according to which one of the two types of the second network device is used. In response, the TCP acceleration capability of the second network device is determined.
  • the two-end acceleration negotiation packet is used to negotiate with the second network device to perform double-ended TCP acceleration on the TCP packet.
  • the double-end acceleration negotiation packet can detect whether the second network device supports double-ended TCP acceleration: if the second network device The second network device responds to the double-end acceleration negotiation packet and returns the double-end acceleration confirmation packet, so that the first network device determines the second network device when receiving the double-end acceleration acknowledgement packet. Supports double-ended TCP acceleration. If the second network device does not support double-ended TCP acceleration, the second network device does not respond to the double-ended acceleration negotiation packet.
  • the double-end acceleration negotiation packet carries the identifier of the destination terminal and the identifier of the second network device.
  • the SYN packet is used to establish a TCP connection with the second network device. If the second network device supports the double-end TCP acceleration, the second network device discards the SYN packet and does not respond to the SYN packet. If the second network device does not support the double-end TCP acceleration, the second network device sends a SYN-ACK packet to the first network device in response to the SYN packet, so that the first network device determines that the SYN-ACK packet is received. The second network device does not support double-ended TCP acceleration.
  • the SYN packet carries the identifier of the destination terminal and the identifier of the second network device.
  • Step 2 The second network device receives the double-end acceleration negotiation packet and the SYN packet.
  • the second network device After receiving the double-ended acceleration negotiation packet and the SYN packet, the second network device discards the SYN packet, and responds to the double-end acceleration negotiation packet, and performs the following if the second network device determines that it has the capability of double-end TCP acceleration. Step 3, if the second network device does not have the capability of double-end TCP acceleration, the second network device cannot identify the double-end acceleration negotiation message, but identifies the SYN message, and therefore, the second network device follows the TCP protocol.
  • the three-way handshake mechanism in response to the SYN packet, performs the following step five.
  • the dual-end acceleration negotiation packet may be parsed to obtain the identifier of the destination terminal carried in the double-end acceleration negotiation packet, thereby determining the purpose.
  • the terminal establishes a TCP connection with the destination terminal, so as to forward the TCP packet to the destination terminal.
  • the second network device can perform the first handshake with the destination terminal by using the three-way handshake mechanism in the TCP protocol. For example, the second network device can generate a SYN packet, where the source IP address of the SYN packet is the IP address of the source terminal.
  • the second network device may send the SYN packet to the destination terminal, and the destination terminal receives the SYN packet.
  • the source IP address of the SYN packet is identified as the IP address of the source terminal, and the SYN packet is determined.
  • the text comes from the source terminal, that is, the destination terminal senses that it has handshake with the source terminal for the first time, and the second network device implements the function of the transparent proxy.
  • Step 3 The second network device generates a double-end acceleration acknowledgement packet, and sends a double-end acceleration acknowledgement packet to the first network device.
  • the double-ended acceleration acknowledgement packet is an acknowledgement (ACK) packet for the double-ended acceleration negotiation packet, and the double-end acceleration acknowledgement packet is used to confirm that the double-ended TCP acceleration can be performed with the first network device, and the second network device can be instructed. Has the ability to support double-ended TCP acceleration.
  • ACK acknowledgement
  • Step 4 The first network device receives the double-end acceleration confirmation packet.
  • the first network device After receiving the double-ended acceleration acknowledgement packet, the first network device can determine that the second network device supports double-end TCP acceleration, and subsequently accelerates the TCP packet according to the double-ended TCP acceleration mode.
  • the first network device may perform a second handshake and a third handshake with the source terminal by using a three-way handshake mechanism in the TCP handshake protocol, thereby establishing a TCP connection with the source terminal.
  • the first network device may generate a SYN-ACK packet, where the source IP address of the SYN-ACK packet is an IP address of the destination terminal, and the first network device may send the SYN-ACK packet to the source terminal, where the source terminal is After receiving the SYN-ACK packet, the source IP address of the SYN-ACK packet is the IP address of the destination terminal, and the SYN-ACK packet is determined to be from the destination terminal.
  • the source terminal senses that it has performed the same with the destination terminal. Two handshakes. After that, the source terminal initiates a third handshake process, generates an ACK packet, and sends an ACK packet to the first network device, and the first network device receives the ACK packet, thereby performing a third handshake with the source terminal. The process of establishing a TCP connection with the source terminal is completed.
  • Step 5 The second network device generates a SYN-ACK packet, and sends a SYN-ACK packet to the first network device, where the SYN-ACK packet is used to confirm that the SYN packet has been received.
  • Step 6 The first network device receives the SYN-ACK packet.
  • the first network device may determine that the second network device does not support double-end TCP acceleration, and then accelerate the TCP packet according to the single-ended TCP acceleration mode.
  • the first network device may perform a second handshake and a third handshake with the source terminal by using a three-way handshake mechanism in the TCP handshake protocol, thereby establishing a TCP connection with the source terminal.
  • a second handshake and a third handshake with the source terminal by using a three-way handshake mechanism in the TCP handshake protocol, thereby establishing a TCP connection with the source terminal.
  • the source terminal sends a TCP packet, and the destination network device of the TCP packet is a second network device.
  • the first network device receives the TCP packet.
  • the process of receiving the TCP packet by the first network device is the same as the process of receiving the SYN packet, and details are not described herein.
  • the first network device performs TCP acceleration on the TCP packet according to the TCP acceleration capability of the second network device, and sends the accelerated TCP packet to the second network device.
  • the first network device may perform the following implementation manner 1: When the second network device does not support the double-end TCP acceleration, the first network device may perform the following implementation manner 2:
  • the first network device performs the double-end TCP acceleration on the TCP packets sent to the second network device, and sends the double-ended accelerated TCP packet to the second network device.
  • double-ended TCP acceleration is implemented based on the same acceleration algorithm stored by two network devices, it can be flexibly controlled and adjusted according to service requirements. At the same time, double-ended TCP acceleration can introduce the process of compressing and buffering packets, and significantly improve the efficiency of network transmission. Therefore, double-ended TCP acceleration is generally better than single-ended TCP acceleration in network transmission performance.
  • the first network device can preferentially perform double-ended TCP acceleration, and if the first network device determines that the second network device supports double-ended TCP acceleration, when receiving the TCP sent to the second network device After the packet is received, the first network device performs double-ended TCP acceleration on the TCP packet, and then sends the double-ended accelerated TCP packet to the second network device, thereby implementing high-speed transmission of the TCP packet.
  • the first network device may be configured with a preset acceleration algorithm, and the first network device may use the preset acceleration algorithm to process the TCP packet.
  • the processing is performed, for example, the TCP packet is compressed, and the processed TCP packet is used as a double-ended accelerated TCP packet, and the double-ended accelerated TCP packet is sent to the second network device.
  • the first network device may pre-configure a TCP acceleration policy, including preferential double-ended TCP acceleration, only single-ended TCP acceleration, and only double-ended TCP acceleration.
  • the priority double-ended TCP acceleration strategy supports dual-end TCP acceleration and single-ended TCP acceleration, and indicates that the first network device preferentially double-end TCP acceleration, and secondly uses single-ended TCP acceleration, so when the first network device determines
  • the configured TCP acceleration policy performs double-ended TCP acceleration on TCP packets when priority is given to double-ended TCP acceleration.
  • the TCP acceleration policy of the first network device can be configured according to the requirements of the user, so as to ensure that the TCP acceleration mode of the first network device meets the user requirements.
  • each network device can be connected to the controller, and the user can configure a correspondence between the network device and the TCP acceleration policy on the controller, and the controller sends a corresponding TCP acceleration policy to each network device, and each The network device receives the TCP acceleration policy of the controller, thereby obtaining a TCP acceleration policy.
  • the second network device performs the single-ended TCP acceleration on the TCP packet sent to the second network device, and sends the single-ended accelerated TCP packet to the second network device.
  • the first network device can pass Loss-based (packet-based congestion judgment and processing), Delay-based (delay-based congestion judgment and processing), and Learning-based (learning-based congestion)
  • Loss-based packet-based congestion judgment and processing
  • Delay-based delay-based congestion judgment and processing
  • Learning-based learning-based congestion
  • the first network device can automatically perform TCP acceleration according to the TCP acceleration capability of the second network device, without manually planning the acceleration mode of the TCP packet, and eliminating the need for the manual TCP acceleration mode of the first pair of network devices. Deployment greatly improves efficiency. Further, the process of the TCP acceleration of the first network device is matched with the TCP acceleration capability of the second network device, and the double-end TCP acceleration of the TCP packet is avoided when the second network device does not support the double-end TCP acceleration. The TCP packet transmission failed.
  • the first network device may temporarily detect the TCP acceleration capability of the second network device before establishing a session with the second network device, thereby obtaining the latest TCP acceleration capability of the second network device, by using the latest TCP acceleration of the second network device.
  • the second network device receives the accelerated TCP packet, and sends the TCP packet to the destination terminal.
  • the second network device When the first network device performs the first implementation manner in the foregoing step 407, the second network device performs the following implementation manner A. When the first network device performs the second implementation manner in the foregoing step 407, the second network device performs the following implementation. Mode B.
  • the implementation mode A the second network device receives the double-ended accelerated TCP packet, and converts the double-ended accelerated TCP packet into a TCP packet, and sends the TCP packet to the destination terminal.
  • the TCP packet can be obtained by the acceleration algorithm.
  • the second network device can pre-store the acceleration algorithm, and the double-ended accelerated TCP packet is inversely calculated by the acceleration algorithm to be restored to TCP.
  • the packet is sent to the destination terminal.
  • the second network device receives the single-ended accelerated TCP packet, and sends the single-ended accelerated TCP packet to the destination terminal.
  • the difference from the foregoing implementation manner A is that, since the process of the single-ended TCP acceleration is compatible with the TCP protocol, the content of the TCP packet is not changed, so after the second network device receives the TCP packet after the single-end acceleration, the single network device The TCP packet sent by the terminal can be sent to the destination terminal without performing an operation on the packet through the acceleration algorithm.
  • the destination terminal receives the TCP packet.
  • the destination terminal After receiving the TCP packet, the destination terminal can further process the TCP packet.
  • the TCP acceleration capability of the second network device is detected before the first network device establishes a session with the second network device.
  • the TCP packet is double-ended.
  • TCP acceleration when the second network device does not support the double-end TCP acceleration, performs single-ended TCP acceleration on the TCP packet, and performs TCP acceleration on the TCP packet according to the TCP acceleration capability of the second network device, without manual deployment.
  • the TCP acceleration mode of a network device improves the efficiency of TCP acceleration. Further, by temporarily detecting the TCP acceleration capability of the second network device, it can be ensured that the obtained TCP acceleration capability of the second network device is strong in real-time and high in accuracy.
  • the network device may also detect the TCP acceleration capability of the peer network device in advance, and record the correspondence between the network device and the TCP acceleration capability.
  • the network device When establishing a session with a network device, the network device only needs to be queried.
  • the correspondence between TCP acceleration capabilities can determine the TCP acceleration capability of the peer network device without temporary detection. The details are described below with reference to the embodiment of Fig. 5.
  • FIG. 5 is a flowchart of a TCP acceleration method according to this embodiment. The method may be applied to the foregoing implementation environment.
  • the interaction entity of the method includes a source terminal, a first network device, a second network device, and a destination terminal, including The following steps:
  • the first network device determines at least one network device from the routing information, where the at least one network device includes a second network device.
  • the first network device may store routing information, where the routing information is used to indicate a path from the first network device to the other network devices, where the first network device may determine at least one network device from the routing information, so as to detect the at least one network device.
  • TCP acceleration capability may include an IP address of at least one network device, and the first network device may obtain an IP address of each network device from the routing information, and determine each network device according to an IP address of each network device.
  • the network of an enterprise is used as an example.
  • the information exchange between the enterprise headquarters and each enterprise branch is often required.
  • the routing information of the routers of the enterprise headquarters can store the routers of each enterprise branch.
  • the IP address is used to detect the TCP acceleration capability of the routers in the enterprise branch based on the routing information of the enterprise headquarters.
  • the routing information of the routers of the enterprise branch can store the IP addresses of other enterprise branches and routers of the enterprise headquarters, so that the routers of the enterprise branch can detect the TCP acceleration capability of other enterprise branches and routers of the enterprise headquarters according to their routing information. .
  • the first network device detects a TCP acceleration capability of the at least one network device.
  • the first network device may sequentially detect the TCP acceleration capability of each network device, so as to generate a correspondence between the network device and the TCP acceleration capability according to the TCP acceleration capability of each network device.
  • the process of detecting the TCP acceleration capability of each network device may include the following steps 1 to 4 for each of the at least one network device. It should be noted that the at least one network device includes a second network device involved in a subsequent session, and also includes a network device other than the second network device.
  • Step 1 The first network device sends a double-ended acceleration negotiation packet to the network device to be detected.
  • the first network device may generate a double-end acceleration negotiation message for the network device to be detected, and establish a network link with the network device to be detected, to the network device to be detected. Sending a double-end acceleration negotiation packet to determine the TCP acceleration capability of the network device to be detected according to whether the network device to be detected receives the response.
  • Step 2 The network device receives the double-ended acceleration negotiation packet.
  • the network device to be detected will respond to the double-ended acceleration negotiation packet and generate a double-ended acceleration acknowledgement packet to the first network. If the device sends a double-ended acceleration confirmation packet, the first network device performs the following step 3. If the network device to be detected does not support the double-end TCP acceleration, the network device to be detected does not respond to the double-ended acceleration negotiation packet when the network device receives the double-ended acceleration negotiation packet. The first network device performs the following steps. four.
  • Step 3 When receiving the double-end acceleration acknowledgement packet of the network device, the first network device determines that the network device supports double-end TCP acceleration.
  • the first network device can receive the double-end acceleration acknowledgement packet, identify the double-end acceleration acknowledgement packet, and determine that the network device to be detected supports double-ended TCP acceleration.
  • the first network device may start timing when sending the double-end acceleration negotiation packet, so as to record the duration after the double-end acceleration negotiation message is sent, when the first network device receives the double-end acceleration within a preset time period.
  • the first network device determines that the network device supports double-ended TCP acceleration.
  • the preset duration is used to indicate the maximum time that the first network device waits for the double-end acceleration confirmation packet, and can be set according to actual service requirements.
  • Step 4 When the first network device does not receive the double-end acceleration acknowledgement packet of the network device, the first network device determines that the network device does not support double-end TCP acceleration.
  • the first network device can determine that the network device to be detected does not Support for double-ended TCP acceleration.
  • the first network device may start timing when the double-end acceleration negotiation message is sent. If the length of time elapsed after the first network device sends the double-end acceleration negotiation message exceeds the preset duration, the first network device is still not When receiving the double-ended acceleration acknowledgement packet, the first network device can determine that the network device to be detected does not support double-ended TCP acceleration, and does not need to wait for the reply of the network device.
  • the first point to be explained is that after the first network device determines the TCP acceleration capability of any network device, the network connection established with the network device can be removed, and when the network device is to establish a session with the network device, The network device establishes a network connection.
  • the second step is to describe the TCP acceleration capability of a network device as an example.
  • the first network device can detect the TCP acceleration capability of at least one network device in the same manner.
  • the TCP acceleration capability of each network device in the routing information is determined.
  • the first network device records a correspondence between each network device and a TCP acceleration capability.
  • the correspondence between the network device and the TCP acceleration capability may be recorded, and the correspondence between the network device and the TCP acceleration capability is used to indicate the TCP of the network device. Acceleration ability.
  • the correspondence between the network device and the TCP acceleration capability can be as shown in Table 1 below.
  • the network device may be represented by an identifier of the network device, and the TCP acceleration capability may be represented by an identifier of the TCP acceleration capability, thereby saving the stored data volume.
  • the identifier of the TCP acceleration capability may be “1”, “Y”, etc.
  • the identifier of the TCP acceleration capability may be “0” and “N”. "Wait.
  • the first network device may re-detect the TCP acceleration capability of the at least one network device every preset period, thereby periodically performing the correspondence between the network device and the TCP acceleration capability. Update. Specifically, the first network device may start timing when generating a correspondence between the network device and the TCP acceleration capability, and re-detect the TCP acceleration capability of the at least one network device when the preset period passes, and then according to the currently detected The TCP acceleration capability of each network device updates the correspondence between the network device and the TCP acceleration capability.
  • the correspondence between the network device and the TCP acceleration capability can be used in the network of the Xi'an branch.
  • the device's TCP acceleration capability is updated to support double-ended TCP acceleration.
  • the preset period can be set according to business requirements, for example, one day.
  • the correspondence between the network device and the TCP acceleration capability may be related to the TCP of the peer network device.
  • the acceleration capability is updated accordingly, ensuring that the correspondence between the network device and the TCP acceleration capability can store the latest TCP acceleration capability of the network device, and ensure the timeliness of the correspondence between the network device and the TCP acceleration capability. Then, according to the network device and the TCP. When the TCP acceleration capability of the TCP acceleration function is queried, the TCP acceleration process can be matched with the current TCP acceleration capability of the peer network device.
  • the source terminal sends a SYN packet.
  • This step is the same as step 401 above, and will not be described here.
  • the first network device receives the SYN packet.
  • This step is the same as step 402 above, and will not be described here.
  • the first network device determines the destination network device of the SYN packet, and obtains the second network device.
  • This step is the same as step 403 above, and will not be described here.
  • the first network device queries a correspondence between the second network device and the TCP acceleration capability, and obtains a TCP acceleration capability of the second network device.
  • the first network device detects the TCP acceleration capability of the at least one network device in advance and records the correspondence between the network device and the TCP acceleration capability, and the at least one network device includes the second network device.
  • the first network device only needs to query the correspondence between the second network device and the TCP acceleration capability, so that the TCP acceleration capability of the second network device can be quickly obtained without temporarily detecting the TCP acceleration capability of the second network device.
  • the first network device may negotiate with the second network device according to the TCP acceleration capability of the second network device.
  • the first network device may send a double-end acceleration negotiation message to the second network device, and the second network device returns a double-end acceleration confirmation message to the first network device, where it is determined that the second network device supports the dual-end TCP acceleration. Thereby negotiating.
  • the first network device may send a SYN packet to the second network device, and the second network device returns a SYN-ACK packet to the first network device, thereby performing negotiation.
  • the source terminal sends a TCP packet.
  • the first network device receives the TCP packet, performs TCP acceleration on the TCP packet according to the TCP acceleration capability of the second network device, and sends the accelerated TCP packet to the second network device.
  • the manner of performing TCP acceleration according to the TCP acceleration capability of the second network device may include the following implementations (1) and implementation (2):
  • the first network device performs double-end TCP acceleration on the TCP packet sent to the second network device, and sends the double-ended accelerated TCP packet to the second Internet equipment.
  • the implementation (1) is the same as the implementation in the above step 407, and details are not described herein.
  • the first network device performs single-ended TCP acceleration on the TCP packet sent to the second network device, and sends the single-ended accelerated TCP packet to the first Two network devices.
  • the implementation (2) is the same as the implementation manner 2 in the above step 407, and details are not described herein.
  • the second network device receives the accelerated TCP packet, and sends the TCP packet to the destination terminal.
  • the processing logic of the second network device in this step is the same as the implementation manner A in the foregoing step 408.
  • the processing logic of the second network device in this step is the same as the implementation B in step 408.
  • the destination terminal receives the accelerated TCP packet.
  • the first point is that if the second network device does not belong to the pre-detected at least one network device, the first network device queries the correspondence between the network device and the TCP acceleration capability, and does not obtain the TCP acceleration capability of the second network device.
  • the first network device may temporarily detect the TCP acceleration capability of the second network device, and the process of detecting the TCP acceleration capability is the same as the foregoing step 404 or step 502, and details are not described herein.
  • the second point to be described is that the first network device pre-determines at least one network device to be detected according to the routing information, and detects the network devices, and the network devices include the second network device, thus obtaining
  • the corresponding relationship between the second network device and the TCP acceleration capability is described as an example.
  • the first network device may also detect the second network device when establishing a session with the second network device.
  • the TCP acceleration capability records the correspondence between the second network device and the TCP acceleration capability.
  • the first network device may detect the TCP acceleration capability of the second network device and generate a correspondence between the network device and the TCP acceleration capability when establishing a session with the second network device for the first time, and then the second time.
  • the correspondence between the second network device and the TCP acceleration capability can be directly queried, and the TCP acceleration capability of the second network device is obtained.
  • N is a positive integer greater than two.
  • the first network device records the correspondence between the second network device and the TCP acceleration capability by detecting the TCP acceleration capability of the second network device in advance, and directly queries when establishing a session with the second network device.
  • the corresponding relationship between the second network device and the TCP acceleration capability can obtain the TCP acceleration capability of the second network device, thereby performing TCP acceleration on the TCP packet according to the TCP acceleration capability of the second network device, without manual deployment.
  • the TCP acceleration mode of a network device improves the efficiency of TCP acceleration.
  • the pre-detection result can be directly queried when the session is established, and the TCP acceleration capability of the second network device is determined, and no temporary detection is needed, thereby speeding up transmission of TCP packets.
  • the speed, the time is saved, the efficiency is improved, and the calculation amount is reduced, and the running cost is saved, compared with the process of obtaining the TCP acceleration capability of the peer device for each temporary detection.
  • the double-end acceleration negotiation message and the SYN message are sent for detection.
  • the double-end acceleration negotiation message is sent and the timeout detection is performed.
  • the detection is described as an example.
  • the double-end acceleration negotiation negotiation packet is sent and the timeout detection is performed.
  • the double-end acceleration negotiation negotiation message is sent.
  • the SYN packet is used for detection. In this embodiment, the detection mode is not limited in any scenario.
  • FIG. 6 is a schematic structural diagram of a TCP acceleration apparatus according to this embodiment, which is applied to a first network device, where the apparatus includes: a sending module 601, a determining module 602, and a TCP acceleration module 603.
  • the sending module 601 is configured to send a double-end acceleration negotiation packet.
  • a determining module 602 configured to determine a TCP acceleration capability of the second network device
  • the TCP acceleration module 603 is configured to perform double-ended TCP acceleration or single-ended TCP acceleration on the TCP packet sent to the second network device.
  • the sending module 601 is further configured to perform step one in step 404.
  • the determining module 602 is configured to perform step four and/or step six in step 404.
  • the sending module 601 is configured to perform step 501.
  • the determining module 602 is configured to perform step three and/or step four in step 502.
  • the device further includes:
  • a recording module configured to perform step 503
  • the device also includes:
  • a receiving module configured to receive a TCP packet
  • the query module is configured to query a correspondence between the second network device and the TCP acceleration capability, and obtain a TCP acceleration capability of the second network device.
  • a computer readable storage medium such as a memory comprising instructions executable by a processor in a network device to perform the TCP acceleration method of the above embodiments.
  • the computer readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.
  • the computer program product includes one or more computer program instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer program instructions can be from a website site, computer, server or data
  • the center transmits to another website site, computer, server, or data center by wire or wirelessly.
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (DVD), or a semiconductor medium (such as a solid state hard disk) or the like.

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

Abstract

La présente invention concerne un procédé et un appareil d'accélération de protocole de contrôle de transmission (TPC), se rapportant au domaine technique des réseaux. Ledit procédé est appliqué à un premier dispositif de réseau, le premier dispositif de réseau prenant en charge une accélération de TCP à double extrémité et une accélération de TCP asymétrique, et ledit procédé comprend : l'envoi d'un message de négociation d'accélération à double extrémité à un second dispositif de réseau ; la détermination de la capacité d'accélération de TCP du second dispositif de réseau selon que le premier dispositif de réseau reçoit un message d'accusé de réception d'accélération à double extrémité ; lorsque le second dispositif de réseau prend en charge une accélération de TCP à double extrémité, réalisation d'une accélération de TCP à double extrémité sur le message TCP envoyé au second dispositif de réseau ; et lorsque le second dispositif de réseau ne prend pas en charge une accélération de TCP à double extrémité, réalisation d'une accélération de TCP asymétrique sur le message TCP envoyé au second dispositif de réseau. Dans la présente invention, le premier dispositif de réseau peut effectuer une accélération de TCP sur le message TCP en fonction de la capacité d'accélération de TCP du second dispositif de réseau, sans avoir besoin de déployer manuellement le mode d'accélération de TCP du premier dispositif de réseau, améliorant ainsi l'efficacité d'accélération de TCP.
PCT/CN2019/082000 2018-04-12 2019-04-10 Procédé et appareil d'accélération de protocole tcp WO2019196853A1 (fr)

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