CN101252591B - Apparatus and method for realizing uplink and downlink data separation - Google Patents

Abstract

The invention provides a method and device for realizing the separation of uplink and downlink data. The method mainly includes: the load balancer obtains information related to communication between the load balancer and the client and the server through the transport layer protocol, the related information includes IP address and port information, and the load balancer sends the related information to the Server; after the load balancer receives the data packet sent by the client through the transport layer protocol, it forwards the data packet to the server according to the relevant information, and the server forwards the data packet according to the relevant information directly to the client. The present invention can realize the separation of uplink data and downlink data in cluster systems such as IPTV where the load balancer is applied, reduces the pressure of the load balancer, and greatly improves the robustness of the system.

Description

Method and device for realizing separation of uplink and downlink data

technical field

The invention relates to the field of network communication, in particular to a method and device for realizing the separation of uplink and downlink data.

Background technique

With the rapid development of economy and technology, the Internet (Internet) has brought great changes to people's work, life and entertainment with its rich resources, personalized service and convenient interaction. With the continuous progress of the times, people hope to watch their favorite TV programs anytime and anywhere, and hope to realize the real interaction between media providers and media consumers. Therefore, the timing of traditional TV technology and the service function of one-way broadcasting can no longer meet the above-mentioned needs of people. In this case, IPTV (Interactive Internet Television) technology came into being.

IPTV is a new Internet-based technology and a brand-new media form of personalized and interactive services. It is an infrastructure that utilizes broadband networks, uses home TVs (or computers) as the main terminal equipment, integrates various technologies such as the Internet, multimedia, and communications, and provides home users with digital TVs including digital TVs through the Internet protocol. New technologies for various interactive digital media services. It combines traditional TV technology and related characteristics of broadband Internet, and closely combines communication-oriented services and content-oriented services. It not only enables users to receive broadcast signals, but also allows users to interact with content providers. It can also easily combine TV services, Internet browsing, and a variety of online information consultation, entertainment, education and other functions to realize telecommunications. Network, cable TV network and Internet network "triple play".

Because IPTV mainly provides streaming media services for users, it needs to consume a lot of bandwidth resources, and the server needs to have the ability to endure heavy load pressure for a long time. Therefore, the requirements of IPTV for the processing capacity and network bandwidth of the server are compared with those of the traditional Web server. much higher. At present, the server side of IPTV mainly adopts the trunking system, that is, the trunking system is used to provide streaming media services to a large number of users. In the cluster system, due to the limitation of the processing capability of the server (including I/O capability, CPU processing speed and memory size), the network bandwidth of each cluster node is also limited. Therefore, how to coordinate each cluster node in the cluster system to make it an organic whole to provide services for short-term and long-term users is very important. The load balancing technology is an effective way to solve this problem. Through the load balancing technology, according to the content of the user's request and the load status of each cluster node in the cluster system, a reasonable node is selected to provide services for the user's request, which can greatly improve the speed of the user's data acquisition and solve the problem of massive data concurrency.

In the IPTV system, a separate load balancer is mainly used to achieve load balancing. From the perspective of data flow, the amount of uplink data (such as control information, etc.) from the client to the cluster node is small, while the amount of downlink data (such as RTP data packets, etc.) from the cluster node to the client is very large. For the client, only the load balancer is visible in the entire load balancing system. If all users' uplink data and downlink data are forwarded by the load balancer, the load balancer will be under long-term and high-load pressure. In this way, the load The equalizer will become the bottleneck of the entire IPTV system.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method and device for realizing the separation of uplink and downlink data, so as to solve the problems in the prior art solutions that cannot be applied to various complex test environments and require manual participation.

The purpose of the embodiments of the present invention is achieved through the following technical solutions:

A method for realizing the separation of uplink and downlink data, comprising:

The load balancer obtains relevant information about communicating with the client and the server through the transport layer protocol, the relevant information includes IP address and port information, and the load balancer sends the relevant information to the server;

After receiving the data packet sent by the client through the transport layer protocol, the load balancer forwards the data packet to the server according to the relevant information, and the server directly sends the data packet according to the relevant information to the client.

A load balancer comprising:

A related information processing module is used to obtain related information communicated with the client and the server through the transport layer protocol, the related information includes IP address and port information, and sends the related information to the server;

The data packet forwarding module is configured to forward the data packet to the server according to the relevant information after receiving the data packet sent by the client.

A server comprising:

The relevant information storage module is used to receive and store the relevant information about the communication between the load balancer, the client and the server through the transport layer protocol sent by the load balancer, and the relevant information includes IP address, port number and serial number information;

The client information acquisition module is used to obtain the corresponding IP address, port number and serial number information of the client according to the relevant information stored in the relevant information storage module corresponding to the data packet sent as needed;

The address conversion module is used to modify the source IP address of the data packet to the IP address of the load balancer, modify the source port of the data packet to a port used by the load balancer for communicating with the client, and convert the data packet Modify the destination IP address of the client to the IP address of the client, modify the destination port of the data packet to the port of the client, and for the TCP data packet, also modify the serial number of the TCP data packet to the serial number of the TCP data packet the value obtained after subtracting the difference between the server's initial sequence number and the load balancer's initial sequence number;

A data packet sending module, configured to directly send the modified data packet to the client.

It can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention that the present invention realizes the separation of uplink data and downlink data in cluster systems such as IPTV using a load balancer, reduces the pressure on the load balancer, and greatly improves the performance of the system. robustness.

Description of drawings

FIG. 1 is a schematic diagram of a method for realizing separation of uplink and downlink data according to an embodiment of the present invention, taking TCP as an example;

Fig. 2 is a specific processing flowchart of the method for realizing the separation of uplink and downlink data described in the embodiment of the present invention, taking TCP as an example;

FIG. 3 is a schematic diagram of a method for separating uplink and downlink data according to an embodiment of the present invention, taking UDP as an example;

Fig. 4 is a specific processing flowchart of the method for realizing the separation of uplink and downlink data described in the embodiment of the present invention, taking UDP as an example;

FIG. 5 is a schematic structural diagram of an embodiment of a load balancer for realizing separation of uplink and downlink data provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an embodiment of a server for realizing separation of uplink and downlink data provided by an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, in order to realize the separation of uplink data and downlink data of the cluster system at the transport layer, the load balancer first needs to obtain relevant information about communication between it and the client and server through the transport layer protocol. The information includes IP address and port information, and the load balancer sends the relevant information to the server. The server saves the relevant information.

After the load balancer receives the data packet sent by the client through the transport layer protocol, according to the request content of the data packet, the load condition of the server and the distribution of the request content in the server cluster, obtain the corresponding Server IP address and port information. The load balancer modifies the source IP address of the data packet to the IP address of the load balancer, modifies the source port of the data packet to the port used by the load balancer to communicate with the server, and changes the purpose of the data packet to Modify the IP address to the IP address of the server, modify the destination port of the data packet to the port of the server, and for the TCP data packet, also modify the confirmation number of the TCP data packet to the confirmation number of the TCP data packet plus The value obtained after the difference between the server's initial sequence number and the load balancer's initial sequence number. The load balancer forwards the modified data packet to the server through a transport layer protocol.

The server obtains the corresponding IP address and port information of the client according to the stored relevant information corresponding to the data packets to be sent. The server modifies the source IP address of the data packet to the IP address of the load balancer, modifies the source port of the data packet to the port used by the load balancer to communicate with the client, and modifies the destination IP address of the data packet to The address is modified to the IP address of the client, the destination port of the data packet is modified to the port of the client, and for the TCP data packet, the serial number of the TCP data packet is also modified to be the serial number of the TCP data packet minus the The value obtained after the difference between the server's initial sequence number and the load balancer's initial sequence number. The server directly sends the modified data packet to the client.

Above-mentioned transport layer agreement mainly comprises: TCP (Transmission Control Protocol, Transmission Control Protocol) and UDP (User Datagram Protocol, User Datagram Protocol) two kinds, take TCP and UDP as examples below to illustrate the method of the present invention respectively.

Taking TCP as an example, the schematic diagram of the principle of the method for realizing the separation of uplink and downlink data according to the embodiment of the present invention is shown in Figure 1, and the specific processing flow is shown in Figure 2, including the following steps:

Step 21: The client and the load balancer establish a TCP connection through a three-way handshake, and the load balancer establishes a data structure TCP_CONDITION to store information about the TCP connection.

The client first sends the first handshake packet for establishing a TCP connection to the load balancer. After the LOCAL_IN hook of the Netfilter (network filter) on the load balancer captures the first handshake packet, it does not send the The data packet is delivered to the TCP/IP protocol stack of the system, but its IP header and TCP header are analyzed, and the relevant information of the TCP connection between the client and the load balancer is proposed from the IP header and TCP header, and the relevant information can be Including: client source IP, client source port, initial sequence number when the client initiates a connection, port selected by the load balancer for TCP connection with the client, TCP connection between the client and the load balancer status etc.

The load balancer also establishes a data structure TCP_CONDITION, which is used to save the relevant information of the extracted TCP connection. Then, the load balancer returns a response data packet to the client, and after receiving the response data packet, the client returns a response data packet to the load balancer.

After receiving the response packet from the load balancer, the client sends a confirmation packet to the load balancer, which is also captured and discarded by the LOCAL_IN hook of Netfilter on the load balancer. So far, the client and the load balancer The TCP connection between them is established.

Step 22, the load balancer establishes a TCP connection with the multimedia server through a three-way handshake, and saves the relevant information of the TCP connection in the above-mentioned TCP_CONDITION.

The client sends a data request packet to the load balancer. After the data request packet is captured by the Netfilter on the load balancer, the data packet is withheld. According to the content of the data request packet (such as movie name, etc.) and the load information of each multimedia server (ie cluster node) collected by the load balancer, a suitable multimedia server is selected to serve the above-mentioned client. The load balancer needs to note down the IP address and port number of the multimedia server.

Then, the load balancer establishes a TCP connection with the above-mentioned multimedia server through a three-way handshake, and saves relevant information of the TCP connection in the above-mentioned TCP_CONDITION. For the TCP connection from the load balancer to the multimedia server, the initial sequence number used by the load balancer is the sequence number used by the client in the TCP connection established between the client and the load balancer.

Therefore, the above TCP_CONDITION contains the following parameters:

saddr;//Client source IP;

sport;//Client source port;

ClientSourceseq;//The initial sequence number when the client initiates a connection;

diff;//The difference between the initial serial number of the multimedia server and the initial column number used by the load balancer when the load balancer establishes a TCP connection with the client;

port_connect_server; //The port selected by the load balancer for TCP connection with the multimedia server;

port_connect_client; //The port selected by the load balancer for TCP connection with the client;

daddr; //The IP address of the target multimedia server selected by the negative balancer;

dport; //The port number of the target multimedia server selected by the load balancer;

ServerSourceseq;//The initial sequence number selected by the server;

tcpstatus;//The status of the TCP connection;

ClientFinACK;//A value used to end the TCP connection. Only when the ACK received by the client is greater than this value, the server considers that the client is complete, and the TCP connection can be closed safely at this time;

ServerFinACK;//A value used to end the TCP connection. Only when the ACK received by the server is greater than this value, the client considers that the server is confirmed to be completed. At this time, the TCP connection can be closed safely;

The status of the TCP connection is as follows:

TCPstatus_NEW, indicating that the client just sent the first packet for establishing a TCP connection;

TCPstatus_CLIENTCONNECTOK, indicating that the client has sent the third data packet of the handshake, and the client can accept and send information;

TCPstatus_SERVERCONNECTOK, indicating that the handshake between the client and the server has been completed, and information can be sent to the server;

TCPstatus_CLIENT_SET_FIN, indicating that the client actively terminated, sent a FIN message, and waited for the server to respond;

TCPstatus_SERVER_SET_FIN, indicating that the server has actively ended and sent a FIN message, waiting for the client to respond;

TCPstatus_CLIENT_SET_FIN_SERVERCLOSE, indicating that the client has sent a FIN message, but the server has ended normally;

TCPstatus_SERVER_SET_FIN_CLIENTCLOSE, indicating that the server has sent a FIN message, and the client has ended normally;

TCPstatus_CLIENTCLOSE, indicating that the client has received the ACK message from the server and has ended and can no longer receive data;

TCPstatus_SERVERCLOSE, indicating that the server has received the ACK message from the client, and it has ended and can no longer receive data;

TCPstatus_SERVERCLOSE_CLIENTCLOSE, indicating that both ends have ended and the connection can be released.

The load balancer also hashes the saddr, sport, port_connect_client and other parameters in the above TCP_CONDITION to generate a hash table Hash_CLIENT_BALANCER_TCP. Hash the daddr, dport, port_connect_server and other parameters in the above TCP_CONDITION to generate another hash table Hash_BALANCER_SERVER_TCP. Store the above two hash tables in association with the above TCP_CONDITION. Therefore, the above TCP_CONDITION can be indexed through the above two hash tables.

Step 23: The load balancer sends the above TCP_CONDITION to the multimedia server, and the load balancer performs address translation on the uplink data packet according to the TCP_CONDITION, and forwards it to the multimedia server. The multimedia server converts the address of the downlink data packet according to the TCP_CONDITION, and sends it directly to the client.

The load balancer sends the above TCP_CONDITION to the multimedia server through the UDP protocol. At the same time, the timeout retransmission mechanism is started on the load balancer to ensure that the data packet containing the TCP_CONDITION information can reach the multimedia server, and the multimedia server will save the received TCP_CONDITION.

The upstream data packet sent by the client to the multimedia server is first sent to the load balancer. After the Netfilter on the load balancer captures the data packet, it hashes its saddr, sport, port_connect_client, according to the above hash table Hash_CLIENT_BALANCER_TCP Find the above TCP_CONDITION. According to the above TCP_CONDITION, change the source IP of the packet to the IP of the load balancer, the source port number to port_connect_server, the destination IP to daddr, the destination port to dport, and add the value of diff to the confirmation sequence number. After the checksum is recalculated, the modified data request packet is sent to the multimedia server through the TCP protocol.

The purpose of the above-mentioned processing by the load balancer is to make the multimedia server "think" that the data packets it receives are from the load balancer, regardless of the client, so that it is transparent to the multimedia server.

Netfilter on the multimedia server intercepts and checks all data packets sent by all multimedia servers. If it is a data packet sent to the port_connect_server port of the load balancer, the data packet is modified, and the destination IP address of the data packet is changed to For saddr, the target port number is changed to sport, the source IP address is changed to the IP of the load balancer, the source port number is changed to port_connect_client, the TCP sequence number of the data packet is subtracted from the value of diff, and other parameters remain unchanged. After calculating the checksum, send the packet. Since the destination IP and destination port number of the data packet are both the IP and port number of the client, these data packets will directly reach the client after being routed without going through the load balancer. In this way, the separation of uplink data and downlink data is realized. For the client, it will "think" that the received data packet comes from the load balancer, and has nothing to do with the background multimedia server, thus achieving transparency to the client.

Taking UDP as an example, the principle schematic diagram of the method for realizing the separation of uplink and downlink data according to the embodiment of the present invention is shown in Figure 3, and the specific processing flow is shown in Figure 4, including the following steps:

Step 41, the client sends a UDP data packet for data request to the load balancer, and the load balancer establishes a data structure UDP_CONDITION to save the relevant information of the UDP data packet between the client and the client.

The client first sends a UDP data packet for data requests to the load balancer. After the Netfilter on the load balancer captures the UDP data packet, it judges the transport layer protocol domain of the data packet. If it is determined that the data packet is sent to the load balancer If there is a UDP packet on a specific port of the server, the UDP packet will be withheld. The load balancer extracts relevant information of the UDP data packet, and the relevant information may include: the IP of the client, the port number of the client, the port selected by the load balancer for communicating with the client, and the like.

The load balancer also establishes a data structure UDP_CONDITION, which is used to save the relevant information of the above-mentioned extracted UDP data packets. Then analyze the request content of the UDP message, select a suitable multimedia server to provide services for the request according to the request content, the current load status of the server and the distribution of the content in the server cluster, and record the IP address and Port number, which is stored in the data structure UDP_CONDITION.

Then, the load balancer sends the data structure UDP_CONDITION to the previously selected multimedia server through the UDP protocol.

Therefore, the above UDP CONDITION contains the following parameters:

saddr; // client IP;

sport;//The port number of the client;

port_connect_server; //The port number used by the load balancer to communicate with the background multimedia server;

port_connect_client; //The port number used by the load balancer to communicate with the client;

daddr; //IP of the multimedia server;

dport;//The port number of the multimedia server.

The load balancer also hashes the saddr, sport, port_connect_client and other parameters in the above UDP_CONDITION to generate a hash table Hash_CLIENT_BALANCER_UDP. Hash the daddr, dport, port_connect_server and other parameters in the above UDP_CONDITION to generate another hash table Hash_BALANCER_SERVER_UDP. Associate and save the above two hash tables and the above UDP_CONDITION. Therefore, the above UDP_CONDITION can be indexed through the above two hash tables.

Step 42: The load balancer sends the above UDP_CONDITION to the multimedia server, and the load balancer performs address translation on the uplink data packet according to the UDP_CONDITION, and forwards it to the multimedia server. The multimedia server converts the address of the downlink data packet according to the UDP_CONDITION and sends it directly to the client.

The load balancer sends the above UDP_CONDITION to the multimedia server through the UDP protocol. At the same time, the timeout retransmission mechanism is started on the load balancer to ensure that the data packet containing the UDP_CONDITION information can reach the multimedia server, and the multimedia server will save the received UDP_CONDITION.

The uplink UDP packet sent by the client to the multimedia server is first sent to the load balancer. After the LOCAL IN hook of Netfilter on the load balancer captures the UDP packet, it hashes its saddr, sport, port connect client, Find the above UDP_CONDITION according to the above hash table Hash_CLIENT_BALANCER_UDP. According to the above UDP_CONDITION, change the source IP of the packet to the IP of the load balancer, the source port number to port_connect_server, the destination IP to daddr, and the destination port to dport. After the checksum is recalculated, the modified UDP packet is sent to the multimedia server.

The purpose of the above-mentioned processing by the load balancer is to make the multimedia server "think" that the data packets it receives are from the load balancer, regardless of the client, so that it is transparent to the multimedia server.

The LOCAL_OUT hook of Netfilter on the multimedia server intercepts and checks all data packets sent by all multimedia servers. If it is a UDP data packet sent to the port_connect_server port of the load balancer, the UDP data packet is modified, and the UDP data packet The destination IP address of the packet is changed to saddr, the destination port number is changed to sport, the source IP address is changed to the IP of the load balancer, the source port number is changed to port_connect_client, and other parameters remain unchanged. After recalculating the checksum, the UDP packets are sent. Since the destination IP and destination port number of the UDP data packet are both the IP and port number of the client, these data packets will directly reach the client after being routed without passing through the load balancer. In this way, the separation of uplink data and downlink data is realized. For the client, it will "think" that the received data packet comes from the load balancer, and has nothing to do with the background multimedia server, thus achieving transparency to the client.

The device for realizing the separation of uplink and downlink data provided by the embodiment of the present invention includes a load balancer and a server. The structure of an embodiment of the above load balancer is shown in Figure 5, including the following modules:

A related information processing module is used to obtain related information communicated with the client and the server through the transport layer protocol, the related information includes IP address and port information, and sends the related information to the server;

The data packet forwarding module is configured to forward the data packet to the server according to the relevant information after receiving the data packet sent by the client through the transport layer protocol. Including: server information acquisition module, address conversion module and data packet sending module.

Wherein, the server information acquisition module in the data packet forwarding module is configured to, after receiving the data packet sent by the client through the transport layer protocol, according to the request content of the data packet, the load condition of the server and the distribution of the request content, and obtain the corresponding IP address and port information of the server;

Wherein, the address translation module is used to modify the source IP address of the data packet to the IP address of the load balancer, modify the source port of the data packet to the port used by the load balancer to communicate with the server, and convert the data The destination IP address of the packet is modified to the IP address of the server, the destination port of the data packet is modified to the port of the server, and for the TCP data packet, the confirmation number of the TCP data packet is also modified to the TCP The value obtained by adding the difference between the initial sequence number of the server and the initial sequence number of the load balancer to the acknowledgment number of the data packet;

Wherein, the data packet sending module in the data packet forwarding module is configured to forward the modified data packet to the server through a transport layer protocol.

The structure of an embodiment of the above-mentioned server is shown in Figure 6, including the following modules:

The relevant information storage module is used to receive and store the relevant information about the communication between the load balancer, the client and the server through the transport layer protocol sent by the load balancer, the relevant information includes IP address, port information and serial number information;

The client information acquisition module is used to obtain the corresponding IP address, port number and serial number information of the client according to the relevant information stored in the relevant information storage module corresponding to the data packet sent as needed;

The address conversion module is used to modify the source IP address of the data packet to the IP address of the load balancer, modify the source port of the data packet to a port used by the load balancer for communicating with the client, and convert the data packet Modify the destination IP address of the client to the IP address of the client, modify the destination port of the data packet to the port of the client, and for the TCP data packet, modify the serial number of the TCP data packet to the serial number of the TCP data packet minus The value obtained after subtracting the difference between the server's initial sequence number and the load balancer's initial sequence number;

A data packet sending module, configured to directly send the modified data packet to the client.

In summary, after applying the device and method of the present invention, the separation of uplink data and downlink data in cluster systems such as IPTV using a load balancer has been realized, the pressure on the load balancer has been reduced, and the robustness of the system has been greatly improved. sex.

The invention not only realizes the complete transparency of the server to the client, but also realizes the complete transparency of the client to the multimedia server. The invention analyzes the content requested by the user in the system kernel, avoids copying the data packet from the kernel space to the user space, and greatly improves the execution efficiency of the system.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. A method for realizing the separation of uplink and downlink data, comprising: The load balancer obtains relevant information about communicating with the client and the server through the transport layer protocol, the relevant information includes IP address and port information, and the load balancer sends the relevant information to the server; After receiving the data packet sent by the client through the transport layer protocol, the load balancer forwards the data packet to the server according to the relevant information, and the server directly sends the data packet according to the relevant information to said client; Wherein, the server directly sends the data packet to the client according to the relevant information, specifically including: The server queries the relevant information according to the source IP address, source port and destination port information of the data packet to be sent, and obtains the corresponding address and port information of the client; The server modifies the source IP address of the data packet to the IP address of the load balancer, modifies the source port of the data packet to the port used by the load balancer to communicate with the client, and modifies the destination IP address of the data packet to Modify the address to the IP address of the client, modify the destination port of the data packet to the port of the client, and modify the serial number of the data packet to the value obtained after subtracting the difference from the serial number of the data packet, wherein , the difference is the difference between the initial serial number of the server and the initial serial number of the load balancer; The server directly sends the modified data packet to the client. 2. The method according to claim 1, wherein the load balancer obtains relevant information related to communication between it and the client and the server through a transport layer protocol, the relevant information includes address and port information, and the The above load balancer sends the relevant information to the server, specifically including: When the load balancer receives the data packet sent by the client through the transport layer protocol, it extracts the relevant information of communication with the client from the data packet, and stores the relevant information in the data structure; The load balancer selects a server for the client according to the content in the data packet, the load of the server, and the distribution of the requested content in the server, and sends a data packet to the server through the transport layer protocol, from extract relevant information for communication with the server from the data packet returned by the server, and store the relevant information in the data structure; The load balancer sends the data structure to the server through the transport layer protocol. 3. The method according to claim 2, wherein when the load balancer communicates with the client and the server through the Transmission Control Protocol TCP, the relevant information includes: IP address and port of the client, initial serial number of the client, port for TCP connection between the load balancer and the server, port for TCP connection between the load balancer and the client, IP address and port of the server, initial serial number of the server, TCP The state of the connection. 4. The method according to claim 2, wherein when the load balancer communicates with the client and the server through the User Datagram Protocol (UDP), the relevant information includes: The IP address and port number of the client, the port for UDP communication between the load balancer and the server, the port for UDP communication between the load balancer and the client, and the IP address and port of the server. 5. The method according to any one of claims 1 to 4, characterized in that, after the load balancer receives the data packet sent by the client through the transport layer protocol, according to the relevant information, the The data packet is forwarded to the server, specifically including: After the load balancer receives the data packet sent by the client through the transport layer protocol, it queries the relevant information according to the source IP address, source port and destination port of the data packet, and obtains the corresponding IP address of the server. address and port information; The load balancer modifies the source IP address of the data packet to the IP address of the load balancer, modifies the source port of the data packet to the port used by the load balancer to communicate with the server, and changes the purpose of the data packet to Modify the IP address to the IP address of the server, and modify the destination port of the data packet to the port of the server; The load balancer forwards the modified data packet to the server. 6. The method according to claim 5, wherein, when the load balancer communicates with the client and the server through TCP, the load balancer also modifies the acknowledgment number of the data packet to the The packet's acknowledgment number plus the difference between the server's initial sequence number and the load balancer's initial sequence number. 7. A load balancer, characterized in that, comprising: A related information processing module is used to obtain related information communicated with the client and the server through the transport layer protocol, the related information includes IP address and port information, and sends the related information to the server; A data packet forwarding module, configured to forward the data packet to the server according to the relevant information after receiving the data packet sent by the client; Wherein, the data packet forwarding module specifically includes: The server information obtaining module is used to obtain the corresponding information according to the request content of the data packet, the load condition of the server and the distribution condition of the request content in the server after receiving the data packet sent by the client through the transport layer protocol. The IP address and port information of the above server; The address translation module is used to modify the source IP address of the data packet to the IP address of the load balancer, modify the source port of the data packet to the port used by the load balancer for communicating with the server, and modify the source IP address of the data packet to the port used by the load balancer to communicate with the server. The destination IP address is modified to the IP address of the server, the destination port of the data packet is modified to the port of the server, and for the TCP data packet, the confirmation number of the TCP data packet is also modified to the TCP data packet The value obtained after adding the difference value to the confirmation number of , wherein the difference value is the difference between the initial sequence number of the server and the initial sequence number of the load balancer; A data packet sending module, configured to forward the modified data packet to the server through a transport layer protocol. 8. A server, characterized in that, comprising: The relevant information storage module is used to receive and store the relevant information about the communication between the load balancer, the client and the server through the transport layer protocol sent by the load balancer, and the relevant information includes IP address, port number and serial number information; The client information acquisition module is used to obtain the corresponding IP address, port number and serial number information of the client according to the relevant information stored in the relevant information storage module corresponding to the data packet sent as needed; The address conversion module is used to modify the source IP address of the data packet to the IP address of the load balancer, modify the source port of the data packet to a port used by the load balancer for communicating with the client, and convert the data packet Modify the destination IP address of the client to the IP address of the client, modify the destination port of the data packet to the port of the client, and for the TCP data packet, also modify the sequence number of the TCP data packet to the sequence of the TCP data packet number obtained after subtracting the difference, wherein the difference is the difference between the initial sequence number of the server and the initial sequence number of the load balancer; A data packet sending module, configured to directly send the modified data packet to the client.

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