CN106936875B - Improvement TCP agent method based on wide area network data compression - Google Patents
Improvement TCP agent method based on wide area network data compression Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/565—Conversion or adaptation of application format or content
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/562—Brokering proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
Abstract
The invention discloses a kind of improvement TCP agent methods based on wide area network data compression, connection request is issued when proxy server listens to server of the client in local area network into target LAN, then the connection request with wide area network label can be sent to agent client by proxy server；Privately owned option negotiation is carried out in connection establishment process between proxy server and agent client；After the completion of connection, agent client and proxy server use local termination mode to carry out response to data；Based on wan environment, the data communication between proxy server and agent client using improved Transmission Control Protocol mechanism and is used cooperatively wide area network compress technique.The present invention can effectively reduce the time overhead of wide area network data transmission, improve the utilization rate of wide area network bandwidth, accelerate the speed of file and data transmission.
Description
Technical field
The present invention relates to wide area network acceleration technique, especially a kind of improvement TCP agent side based on wide area network data compression
Method.
Background technique
With the rapid advances of economic fast development and science and technology, huge change is also had occurred in the form and scale of enterprise
Change.Either large-scale enterprise group, the medium-sized and small enterprises being in fast development process, the distributed pattern of enterprises is all
It is the problem that enterprise needs to face in the construction and office automatic for carrying out information system.A large amount of domestic or even external strange lands
The presence of branch and office (hereinafter referred to as branch), there are the operation system and data of oneself in each branch, in order to realize height
The synergetic office work of efficiency will be dispersed in the Internal Small-scale information system and job network of various regions branch in the way of the network interconnection
Connect collaborative work, entire intra-company realize the transmission of round-the-clock large-scale data and application service it is shared most
Good solution.
Transmission Control Protocol is being pacified at the beginning of the time delay as brought by Transmission Control Protocol acknowledgement mechanism itself and congestion control, and birth
Excessive consideration is not done in terms of full property, along with by the planted factor such as the efficiency of transmission of wide area network, network delay and network congestion
Influence, can each branch of enterprise main problem when being carried out data transmission using TCP be to effectively improve data transmission
Efficiency.Wide area network generally trans-regional cross operator the case where it is very universal, packet loss caused by a large amount of routing and gateway and prolong
When the using effect of Transmission system is had a greatly reduced quality.The transmission speed of wide area network is improved in terms of hardware and infrastructure construction
For, various investments are needed, and be the one long-term process built and develop.For the user as enterprise
Can speech, provide some solutions based on software and communication protocol, enable the data and network communication between enterprise strange land
High efficiency of transmission is enough realized by wide area network, just becomes the extremely urgent demand of enterprise.
Summary of the invention
The object of the present invention is to provide a kind of improvement TCP agent methods based on wide area network data compression, to effectively subtract
The time overhead of few wide area network data transmission, accelerates the speed of file and data transmission.
The technical solution for realizing the aim of the invention is as follows: a kind of improvement TCP agent side based on wide area network data compression
Method, in local area network, client is connect with proxy server, and in target LAN, agent client and server connect
Connect, method the following steps are included:
Step 1 listens to driving event being locally registered based on wan environment, proxy server and client；
Step 2 is sent out when proxy server listens to server of the client in local area network into target LAN
TCP connection is requested out, is localling create a LAN TCP, and report connection request event to application layer；Then create one with
The corresponding WAN TCP of LAN TCP constructs a new connection request SYN ' message by WAN TCP, and is sent to proxy client
End；
Step 3 is sent out when agent client listens to server of the client in local area network into target LAN
TCP connection is requested out, is localling create a WAN TCP, and report connection request event to application layer；Then by request message
In WAN optimization option and local WAN optimize option take intersection, be stored in local；Finally, creation one is corresponding with WAN TCP
LAN TCP, a new connection request SYN message is constructed by LAN TCP, and is sent to server；
The WAN optimization option includes in Transparent Proxy function, redundant data elimination function and data compression function
It is one or more, it is stored in TCP message；
Step 4, when agent client receive server reply SYN+ACK message, be matched to local lan TCP；So
After obtain corresponding WAN TCP, a new SYN+ACK ' message is constructed by WAN TCP, and is sent to agency service
Device；
After step 5, proxy server receive SYN+ACK ' message, it is matched to local WAN TCP；It then will be in message
WAN optimization option and local WAN optimization option take intersection, are stored in local；Corresponding LAN TCP is finally obtained, by
LAN TCP constructs a new SYN+ACK message, does not carry local WAN optimization option in message, and be sent to client；
Step 6, proxy server receive the ACK message of client transmission, and local two TCP connections, which are established, to be completed, Xiang Ying
DATA_READY event is reported with layer；Then new ACK ' message is constructed, local WAN is carried and optimizes option, be sent to agency visitor
Family end；
Step 7, agent client receive the ACK ' message of proxy server transmission, and local two TCP connections, which are established, to be completed,
DATA_READY event is reported to application layer；Then the WAN optimization option in message is taken into intersection with local WAN optimization option,
It is stored in local；New ACK message is finally constructed, local WAN optimization option is not carried, is sent to server；So far, TCP generation
Reason connection, which is established, to be completed；
After step 8, connection are established, the LAN TCP in proxy server receives the client in local area network to mesh
The data message that the server in local area network is sent is marked, ACK message is forged, is sent to client；Then notice application layer is read
Data；Finally, application layer calls data transmission interface, agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receives the client in local area network into target LAN
The data message that server is sent forges ACK message, is sent to proxy server；Then notice application layer reads data；Most
Afterwards, application layer calls data transmission interface, sends the data to server by LAN TCP；Communication process is completed.
Compared with prior art, the invention has the benefit that
(1) agent skill group and wide area network compress technique are combined by the present invention, in proxy server and agent client
Between accelerated using improved TCP protocol stack；Relative to the transmission acceleration method for needing server-side and client, this hair
Bright connection configuration and network topology structure without modifying server-side and client, does not influence the application software of institute's agent object
It uses；
(2) relative to the TCP agent technology for realizing that application layer accelerates, the present invention is between proxy server and client
Transport layer controls TCP data using improved TCP protocol stack, improves wide area network data transmission rate；
(3) it is directed to the representative network application of big file download, the benefit of wide area network bottleneck bandwidth is greatly improved in the present invention
With rate；For the representative network application of Web page access, the present invention is greatly reduced the time of data transmit-receive, reduces webpage
Download time；
(4) present invention combines wide area network compress technique to handle the data in wide area network, and the load for reducing data is big
It is small, mitigate the load of wide area network link, substantially increases the page download speed of web access typical case.
Detailed description of the invention
Fig. 1 is that network of the invention disposes schematic diagram.
Fig. 2 interacts schematic diagram with transport layer for application layer of the present invention.
Fig. 3 is that timing diagram is established in present system connection.
Fig. 4 is the interaction timing diagram of client and server of the invention.
Fig. 5 is system testing networking diagram in the embodiment of the present invention.
Specific embodiment
In conjunction with Fig. 1, Fig. 2, a kind of improvement TCP agent method based on wide area network data compression, in local area network, visitor
Family end is connect with proxy server, and in target LAN, agent client is connect with server, method the following steps are included:
Step 1 listens to driving event being locally registered based on wan environment, proxy server and client；
Step 2 is sent out when proxy server listens to server of the client in local area network into target LAN
TCP connection is requested out, is localling create a LAN TCP, and report connection request event to application layer；Then create one with
The corresponding WAN TCP of LAN TCP constructs a new connection request SYN ' message by WAN TCP, and is sent to proxy client
End；
Step 3 is sent out when agent client listens to server of the client in local area network into target LAN
TCP connection is requested out, is localling create a WAN TCP, and report connection request event to application layer；Then by request message
In WAN optimization option and local WAN optimize option take intersection, be stored in local；Finally, creation one is corresponding with WAN TCP
LAN TCP, a new connection request SYN message is constructed by LAN TCP, and is sent to server；
The WAN optimization option includes in Transparent Proxy function, redundant data elimination function and data compression function
It is one or more, it is stored in TCP message；
Step 4, when agent client receive server reply SYN+ACK message, be matched to local lan TCP；So
After obtain corresponding WAN TCP, a new SYN+ACK ' message is constructed by WAN TCP, and is sent to agency service
Device；
After step 5, proxy server receive SYN+ACK ' message, it is matched to local WAN TCP；It then will be in message
WAN optimization option and local WAN optimization option take intersection, are stored in local；Corresponding LAN TCP is finally obtained, by
LAN TCP constructs a new SYN+ACK message, does not carry local WAN optimization option in message, and be sent to client；
Step 6, proxy server receive the ACK message of client transmission, and local two TCP connections, which are established, to be completed, Xiang Ying
DATA_READY event is reported with layer；Then new ACK ' message is constructed, local WAN is carried and optimizes option, be sent to agency visitor
Family end；
Step 7, agent client receive the ACK ' message of proxy server transmission, and local two TCP connections, which are established, to be completed,
DATA_READY event is reported to application layer；Then the WAN optimization option in message is taken into intersection with local WAN optimization option,
It is stored in local；New ACK message is finally constructed, local WAN optimization option is not carried, is sent to server；So far, TCP generation
Reason connection, which is established, to be completed；
After step 8, connection are established, the LAN TCP in proxy server receives the client in local area network to mesh
The data message that the server in local area network is sent is marked, ACK message is forged, is sent to client；Then notice application layer is read
Data；Finally, application layer calls data transmission interface, agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receives the client in local area network into target LAN
The data message that server is sent forges ACK message, is sent to proxy server；Then notice application layer reads data；Most
Afterwards, application layer calls data transmission interface, sends the data to server by LAN TCP；Communication process is completed.
Further, the company between the connection between client and proxy server, proxy server and agent client
It connects and the connection of agent client and server is TCP connection, the HTTP connection based on TCP or the FTP connection based on TCP.
Proxy server and agent client need to carry out compression processing to data before sending data；Proxy server with
Agent client needs to unzip it data processing after receiving data.
Two TCP of agent client and proxy server safeguard three queues, respectively out-of-order queue, retransmission queue
And transmit queue；Out-of-order queue carries out storage and management to out-of-order data message, and retransmission queue is to having sent but not
The message for receiving confirmation carries out storage and management, the data to be sent such as preservation in transmit queue, to guarantee under normal circumstances
The orderly progress that data are sent.
SYN+ACK ' the message choosing that WAN TCP is sent in SYN ' the message option and step 4 that WAN TCP is sent in step 2
Xiang Zhongjun includes to expand window factor option, enabled selective retransmission option and WAN to optimize option.
Proxy server and agent client include transport stream optimization module and data redundancy cancellation module.
In step 2 after proxy server receives connection request message, LAN TCP state is set to syn_sent, WAN TCP
State is set to syn_sent；In step 3 after agent client receives connection request message, WAN TCP state is set to syn_
Received, LAN TCP state are set to syn_received；After connection is established in step 6, WAN TCP and LAN TCP state is equal
It is set to established；After connection is established in step 7, WAN TCP and LAN TCP state is set to established.
The present invention is described in further details combined with specific embodiments below.
Embodiment
As shown in Figure 1, agency is deployed on gateway, it is located in intranet, the equipment for establishing TCP connection with client
It is proxy server；In another intranet, the equipment for establishing TCP connection with server is agent client；Agency
It is wan environment between client and proxy server.
As shown in Fig. 2, agency is on one side with client communication in same local area network, another side and agency another in wide area network are logical
Letter；WAAS refers to wide area network acceleration equipment application, and FTCP is the transport layer protocol stack of TCP agent；Communication steps are as follows:
Step 1 opens WAAS service in proxy server and agent client, indicates that TCP transmission needs support wide area network
Acceleration function；And it is TFO/DRE/LZ that WAAS ability, which is arranged, indicates that proxy server and agent client are supported based on wide area
The TCP agent function of net compress technique, wide area network application service WAAS listen to driving to FTCP registration and bind corresponding port；
Step 2, user end to server initiate the connection, and agent client is to proxy server transmission source address and purpose
Address is respectively the connection request message of client and server IP address, and carries out the option negotiation of request stage, and FTCP is cut
SYN ' the message for carrying custom option is sent to by the SYN message for obtaining user end to server transmission after FTCP resume module
Agent client, and socket_request event is reported to WAAS application；
Step 3, FTCP intercept and capture the SYN+ACK message that agent client is replied, and remove custom option again by message SYN '
+ ACK is sent to client；
Step 4, FTCP intercept and capture the ACK message that client is sent, and ACK ' is sent to agency visitor again after adding custom option
Family end, and data_ready event is reported to WAAS；
Step 5, WAAS call FTCP_Accept to get and have currently completed the TCP handle that connection is established；
Step 6, FTCP intercept and capture the data message that client is sent, report data_ready thing to WAAS
Part；
Step 7, WAAS read data, then FTCP is transferred to send data；
Step 8, data are sent to agent client after DRE/LZ is handled；
Step 9, the data message that FTCP Intercept and capture service device is sent to client report data_ready event to WAAS；
Step 10, WAAS read data, then FTCP is transferred to send data；
Step 11, contrary operation of the data through DRE/LZ, is sent to client.
As shown in figure 3, the TCP connection that the present invention establishes includes the TCP connection (local between client and proxy server
In net), the TCP connection (in wide area network) between proxy server and agent client and between agent client and server
TCP connection (in local area network).
Proxy server and agent client are integrated in existing gateway, and the process of foundation is as follows:
Step 1 configures the configuration of each agent node according to network structure and application requirement, the WAN optimization including local terminal
Ability, the number of maximum client connection request and the maximum TCP number for completing connection；
Step 2, proxy server and agent client start listening port, monitor client connection；
Step 3, after starting, user end to server request connection, proxy server transmission source address and destination address divide
Not Wei client and server IP address TCP connection request message；
Step 4 after proxy server receives request message, establishes WAN TCP Control and LAN TCP logging TCP letter
Breath, WAN TCP source address and destination address are respectively the source address and destination address of request message, and the source address of LAN TCP
It is respectively the destination address and source address of request message with destination address；Then RECONFIGURATION REQUEST message, addition local WAN optimize energy
Power option does not change the original source address of message and destination address information, and is sent to agent client；
Step 5 after agent client receives request message, establishes WAN TCP Control and LAN TCP logging TCP letter
Breath, WAN TCP source address and destination address are respectively the destination address and source address of request message, and the source address of LAN TCP
It is respectively the source address and destination address of request message with destination address；Then RECONFIGURATION REQUEST message, removal WAN optimization ability choosing
, do not change the original source address of message and destination address information, and be sent to proxy server；
Step 6, until connection is completed, proxy server and agent client, which all have two connections, to be established state and is
The TCP connection of ESTABLISHED；
The present invention is illustrated with data transmission instance below, data transmission includes connection procedure and interactive process, in which:
(1) connection procedure, it is specific as shown in Figure 3, comprising the following steps:
User end to server sends connection request message；
Proxy server sends connection request to agent client, comprising local WAN optimization option, in proxy server
The state of two TCP is syn_sent；
Agent client sends connection request to server, optimizes option not comprising local WAN, and two in agent client
The state of a TCP is syn_sent；
Server replys connection request response；
Agent client replys connection request response, optimizes option comprising local WAN, two TCP in agent client
State be syn_received；
Proxy server replys connection request response, optimizes option not comprising local WAN, and two in agent client
The state of TCP is syn_received；
Client replys the last one response message；
Proxy server replys the last one response message, optimizes option comprising local WAN, connection, which is established, to be completed, at this time
TCP state is established；
Agent client replys the last one response message, does not include local WAN and optimizes option, and connection, which is established, to be completed, this
When TCP state be established.
(2) interactive process, it is specific as shown in Figure 4, comprising the following steps:
User end to server sends datagram；
Proxy server replys ACK message to client；
Proxy server will be sent to agent client after data message compression processing；
The message received is unziped it processing by agent client；
Agent client replys ACK to agent client；
Data after data decompression are sent to server by agent client；
Server replys ACK to agent client.
As shown in figure 5, simulate the WAN being connected with wide area network mouth in gateway with three layers of mouth, simulated with two layers of mouth and office
Net connected LAN mouth in domain carries out Web page access test to system under wan environment.
Client accesses the website on Web server by proxy server and agent client, and gateway deployment is accelerated to exist
On two hosts of agent client and proxy server, three layers of mouth interconnection of the three layers of mouth and agent client of proxy server,
Simulate wan environment；
It is Web page download time that Web page, which accesses test index,；
Testing scheme: this test needs three files, is that the RAR compressed package of a 452.6MB size (calls text in the following text respectively
Part A), the wmv video file (calling file B in the following text) of a 43.1MB size, the TXT text file of a 18.2MB size (is called in the following text
File C).
First carry out three-wheel underlying transport and test reference as follow-up test, the step of test be tri- files of A, B, C by
Sequence is successively transmitted, and is transmitted in total twice；When test, one file of every transmission just records this document and is transmitted rear transmission time
And average transmission rate；The test of this three-wheel underlying transport is respectively as follows:
(1) original transmitted is tested: under the system environments put up, not being started any TCP agent, is carried out by testing procedure
Test；
(2) the underlying transport test based on the TCP agent for improving Transmission Control Protocol: starting transport layer optimization wide area network accelerates skill
The TCP agent of art, i.e. unlatching TFO function, are tested according to testing procedure；
(3) combine the underlying transport test of the improvement TCP agent of wide area network data compression: starting wide area network data compresses skill
The TCP agent of art, i.e. unlatching TFO/DRE/LZ function, are tested according to testing procedure.
In order to avoid randomness brought by system, test result is the average value of multiple test result, as shown in table 1,
The table shows the download times of access Web page:
Table 1
From table 1 it follows that web page download time is longer before deployment accelerates gateway.Deployment accelerates gateway obvious
Reduce web page download time, this explanation is had in data transmission based on the improvement TCP agent method that wide area network data compresses
Higher efficiency of transmission.
Claims (3)
1. a kind of improvement TCP agent method based on wide area network data compression, in local area network, client and agency service
Device connection, in target LAN, agent client is connect with server, which is characterized in that client and proxy server it
Between connection, the connection between proxy server and agent client and the connection of agent client and server be that TCP connects
Connect, the HTTP connection based on TCP or the FTP connection based on TCP, method the following steps are included:
Step 1 listens to driving event being locally registered based on wan environment, proxy server and client；
Step 2 issues TCP when proxy server listens to server of the client in local area network into target LAN
Connection request is localling create a LAN TCP, and is reporting connection request event to application layer；Then one and LAN is created
The corresponding WAN TCP of TCP constructs a new connection request SYN ' message by WAN TCP, and is sent to agent client；
Step 3 issues TCP when agent client listens to server of the client in local area network into target LAN
Connection request is localling create a WAN TCP, and is reporting connection request event to application layer；It then will be in request message
WAN optimization option and local WAN optimization option take intersection, are stored in local；Finally, one LAN corresponding with WAN TCP of creation
TCP constructs a new connection request SYN message by LAN TCP, and is sent to server；
The WAN optimization option includes Transparent Proxy function, redundant data elimination one of function and data compression function
Or it is a variety of, it is stored in TCP message；
Step 4, when agent client receive server reply SYN+ACK message, be matched to local lan TCP；Then it obtains
Corresponding WAN TCP is taken, a new SYN+ACK ' message is constructed by WAN TCP, and be sent to proxy server；
After step 5, proxy server receive SYN+ACK ' message, it is matched to local WAN TCP；Then by the WAN in message
Optimization option and local WAN optimization option take intersection, are stored in local；Corresponding LAN TCP is finally obtained, by LAN
TCP constructs a new SYN+ACK message, does not carry local WAN optimization option in message, and be sent to client；
Step 6, proxy server receive the ACK message of client transmission, and local two TCP connections, which are established, to be completed, to application layer
Report DATA_READY event；Then new ACK ' message is constructed, local WAN is carried and optimizes option, be sent to agent client；
Step 7, agent client receive the ACK ' message of proxy server transmission, and local two TCP connections, which are established, to be completed, Xiang Ying
DATA_READY event is reported with layer；Then the WAN optimization option in message is taken into intersection with local WAN optimization option, saved
In local；New ACK message is finally constructed, local WAN optimization option is not carried, is sent to server；So far, TCP agent connects
Foundation is connect to complete；
After step 8, connection are established, the LAN TCP in proxy server receives the client in local area network to target office
The data message that server in the net of domain is sent, forges ACK message, is sent to client；Then notice application layer reads data；
Finally, application layer calls data transmission interface, agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receives service of the client in local area network into target LAN
The data message that device is sent forges ACK message, is sent to proxy server；Then notice application layer reads data；Finally, answering
Data transmission interface is called with layer, server is sent the data to by LAN TCP；Communication process is completed.
2. the improvement TCP agent method according to claim 1 based on wide area network data compression, which is characterized in that agency
Server and agent client need to carry out compression processing to data before sending data.
3. the improvement TCP agent method according to claim 2 based on wide area network data compression, which is characterized in that agency
Server and agent client need to unzip it data processing after receiving data.
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| CN108833487B (en) * | 2018-05-23 | 2021-05-04 | 南京大学 | TCP transmission protocol proxy method |
| CN109495388B (en) * | 2018-11-30 | 2021-04-27 | 四川安迪科技实业有限公司 | TCP acceleration method based on satellite communication |
| CN110740131B (en) * | 2019-09-30 | 2022-11-04 | 北京达佳互联信息技术有限公司 | Data processing method and device, electronic equipment and storage medium |
| CN112422396B (en) * | 2020-11-04 | 2022-04-19 | 郑州信大捷安信息技术股份有限公司 | TCP network transmission acceleration method and system based on SSLVPN channel |
| CN112685301A (en) * | 2020-12-28 | 2021-04-20 | 浙江国利网安科技有限公司 | Fuzzy test method and device |
| CN112637236B (en) * | 2020-12-31 | 2022-08-16 | 河南信大网御科技有限公司 | HTTP proxy method, architecture and medium for separating from protocol stack |
| CN116647538A (en) * | 2023-06-06 | 2023-08-25 | 深圳市捷讯云联科技有限公司 | Connecting device capable of accessing different intranet services |
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| CN101977234A (en) * | 2010-11-02 | 2011-02-16 | 中南大学 | Parallel TCP (Transmission Control Protocol) technology based wide area network (WAN) communication acceleration method |
| CN101986648A (en) * | 2010-11-24 | 2011-03-16 | 北京星网锐捷网络技术有限公司 | Negotiation method, device and network device of TCP option |
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