CN106936875A - 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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- CN106936875A CN106936875A CN201511026543.1A CN201511026543A CN106936875A CN 106936875 A CN106936875 A CN 106936875A CN 201511026543 A CN201511026543 A CN 201511026543A CN 106936875 A CN106936875 A CN 106936875A
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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 method based on wide area network data compression, when the client that proxy server is listened in local area network sends connection request to the server in target LAN, then the connection request with wide area network mark can be sent to agent client by proxy server；Between proxy server and agent client privately owned option negotiation is carried out during foundation is connected；After the completion of connection, agent client carries out response using local termination pattern with proxy server to data；Based on wan environment, the data communication between proxy server and agent client is using improved Transmission Control Protocol mechanism and with the use of 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 transfer.
Description
Technical field
The present invention relates to wide area network acceleration technique, particularly a kind of improvement TCP agent method based on wide area network data compression.
Background technology
With economic fast-developing and science and technology rapid advances, the form and scale of enterprise also there occurs huge change.
Either large-scale enterprise group, is in the medium-sized and small enterprises in fast development process, and the distributed pattern of enterprises is all
It is problem that enterprise needs to face in the construction of information system and office automatic is carried out.Largely domestic or even foreign countries is different
There are the operation system and data of oneself in ground branch and the presence of office (hereinafter referred to as branch), each branch, in order to
Realize efficient synergetic office work, using the mode of the network interconnection will be dispersed in various regions branch Internal Small-scale information system and
Job network couples together collaborative work, and the large-scale data transfer of round-the-clock and application service are realized in whole intra-company
Shared best solution.
Transmission Control Protocol is in peace at the beginning of by the Transmission Control Protocol time delay that acknowledgement mechanism and congestion control are brought in itself, and birth
Full property aspect does not do excessive consideration, along with the efficiency of transmission by wide area network, network delay and network congestion etc. plant because
The influence of element, can each branch of enterprise subject matter when being carried out data transmission using TCP be that effectively improve data
The efficiency of transmission.The situation of the general trans-regional cross operator of wide area network is very universal, is lost caused by substantial amounts of route and gateway
Bag and time delay cause that the using effect of Transmission system is had a greatly reduced quality.The transmission speed of wide area network is improved from hardware and infrastructure
, it is necessary to many inputs for construction aspect, and be one it is long-term build and development process.For as enterprise this
For the user of sample, some solutions for being based on software and communication protocol can be provided, make the data between enterprise strange land
High efficiency of transmission can be realized by wide area network with network service, just become the extremely urgent demand of enterprise.
The content of the invention
It is an object of the invention to provide a kind of improvement TCP agent method based on wide area network data compression, so as to effectively reduce
The time overhead of wide area network data transmission, accelerates the speed of file and data transfer.
The technical solution for realizing the object of the invention is：A kind of improvement TCP agent method based on wide area network data compression,
In local area network, client is connected with proxy server, and in target LAN, agent client connects with server
Connect, method is comprised the following steps：
Step 1, based on wan environment, proxy server and client intercept driving event being locally registered；
Step 2, sent to the server in target LAN when the client that proxy server is listened in local area network
TCP connection requests, localling create a LAN TCP, and report connection request event to application layer；Then one is created
Individual WAN TCP corresponding with LAN TCP, constructs a new connection request SYN ' message, and send by WAN TCP
To agent client；
Step 3, sent to the server in target LAN when the client that agent client is listened in local area network
TCP connection requests, localling create a WAN TCP, and report connection request event to application layer；Then will request
WAN optimization options in message take common factor with local WAN optimization options, are stored in local；Finally, one and WAN are created
The corresponding LAN TCP of TCP, construct a new connection request SYN message, and be sent to server by LAN TCP；
Described WAN optimization options include in Transparent Proxy function, redundant data elimination function and data compression function
Plant or various, be stored in TCP message；
Step 4, when agent client receive server reply SYN+ACK messages, match local lan TCP；
Then corresponding WAN TCP are obtained, a new SYN+ACK ' message is constructed by WAN TCP, and be sent to
Proxy server；
After step 5, proxy server receive SYN+ACK ' messages, local WAN TCP are matched；Then by message
WAN optimization option and local WAN optimization options take commons factor, be stored in locally；Finally obtain corresponding LAN
TCP, a new SYN+ACK message is constructed by LAN TCP, does not carry local WAN optimizations option in message, concurrently
Give client；
Step 6, proxy server receive the ACK messages of client transmission, and local two TCP connections are set up and completed, to
Application layer reports DATA_READY events；Then new ACK ' messages are constructed, local WAN optimizations option is carried, is sent
To agent client；
Step 7, agent client receive the ACK ' messages of proxy server transmission, and local two TCP connections have been set up
Into reporting DATA_READY events to application layer；Then the WAN optimization options in message are optimized with local WAN and is selected
Item takes common factor, is stored in local；New ACK messages are finally constructed, local WAN optimizations option is not carried, be sent to clothes
Business device；So far, TCP agent connection is set up and is completed；
After step 8, connection are set up, the LAN TCP in proxy server receive client in local area network to mesh
The data message that server in mark LAN sends, forges ACK messages, is sent to client；Then application layer is notified
Read data；Finally, application layer calls data is activation interface, and agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receive client in local area network in target LAN
The data message that server sends, forges ACK messages, is sent to proxy server；Then notify that application layer reads data；
Finally, application layer calls data is activation interface, and server is sent the data to by LAN TCP；Communication process is completed.
Compared with prior art, beneficial effects of the present invention are：
(1) be combined for agent skill group and wide area network compress technique by the present invention, in proxy server and agent client
Between accelerated using the tcp protocol stack after improvement；Relative to the transmission acceleration method for needing service end and client,
Connection configuration and network topology structure of the present invention without modification service end and client, the application of institute's agent object is not influenceed
The use of software；
(2) relative to the TCP agent technology that application layer accelerates is realized, the present invention is between proxy server and client
Transport layer tcp data is controlled using the tcp protocol stack after improvement, improve wide area network data transmission rate；
(3) for the representative network application of big file download, the present invention is greatly improved the profit of wide area network bottleneck bandwidth
With rate；For the representative network application that Web page is accessed, the present invention is greatly reduced the time of data transmit-receive, reduces
Download time of webpage；
(4) present invention is processed the data in wide area network with reference to wide area network compress technique, and the load for reducing data is big
It is small, mitigate the load of wide area network link, substantially increase the page download speed of web access typical case's application.
Brief description of the drawings
Fig. 1 is network design schematic diagram of the invention.
Fig. 2 interacts schematic diagram for application layer of the present invention with transport layer.
Fig. 3 is that timing diagram is set up in present system connection.
Fig. 4 is the interactive 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
With reference to Fig. 1, Fig. 2, a kind of improvement TCP agent method based on wide area network data compression, in local area network,
Client is connected with proxy server, and in target LAN, agent client is connected with server, and method includes following
Step：
Step 1, based on wan environment, proxy server and client intercept driving event being locally registered；
Step 2, sent to the server in target LAN when the client that proxy server is listened in local area network
TCP connection requests, localling create a LAN TCP, and report connection request event to application layer；Then one is created
Individual WAN TCP corresponding with LAN TCP, constructs a new connection request SYN ' message, and send by WAN TCP
To agent client；
Step 3, sent to the server in target LAN when the client that agent client is listened in local area network
TCP connection requests, localling create a WAN TCP, and report connection request event to application layer；Then will request
WAN optimization options in message take common factor with local WAN optimization options, are stored in local；Finally, one and WAN are created
The corresponding LAN TCP of TCP, construct a new connection request SYN message, and be sent to server by LAN TCP；
Described WAN optimization options include in Transparent Proxy function, redundant data elimination function and data compression function
Plant or various, be stored in TCP message；
Step 4, when agent client receive server reply SYN+ACK messages, match local lan TCP；
Then corresponding WAN TCP are obtained, a new SYN+ACK ' message is constructed by WAN TCP, and be sent to
Proxy server；
After step 5, proxy server receive SYN+ACK ' messages, local WAN TCP are matched；Then by message
WAN optimization option and local WAN optimization options take commons factor, be stored in locally；Finally obtain corresponding LAN
TCP, a new SYN+ACK message is constructed by LAN TCP, does not carry local WAN optimizations option in message, concurrently
Give client；
Step 6, proxy server receive the ACK messages of client transmission, and local two TCP connections are set up and completed, to
Application layer reports DATA_READY events；Then new ACK ' messages are constructed, local WAN optimizations option is carried, is sent
To agent client；
Step 7, agent client receive the ACK ' messages of proxy server transmission, and local two TCP connections have been set up
Into reporting DATA_READY events to application layer；Then the WAN optimization options in message are optimized with local WAN and is selected
Item takes common factor, is stored in local；New ACK messages are finally constructed, local WAN optimizations option is not carried, be sent to clothes
Business device；So far, TCP agent connection is set up and is completed；
After step 8, connection are set up, the LAN TCP in proxy server receive client in local area network to mesh
The data message that server in mark LAN sends, forges ACK messages, is sent to client；Then application layer is notified
Read data；Finally, application layer calls data is activation interface, and agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receive client in local area network in target LAN
The data message that server sends, forges ACK messages, is sent to proxy server；Then notify that application layer reads data；
Finally, application layer calls data is activation interface, and server is sent the data to by LAN TCP；Communication process is completed.
Further, between client and proxy server connection, the connection between proxy server and agent client
And agent client and the connection of server are TCP connections, the HTTP connections based on TCP or the FTP based on TCP
Connection.
Proxy server needs to be compressed data treatment before sending data with agent client；Proxy server and generation
Reason client needs to carry out decompression to data 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 is stored and managed to out of order data message, retransmission queue to having sent but
The message for not receiving confirmation is stored and managed, the data to be sent such as preservation in transmit queue, to ensure in positive reason
Data is activation is carried out in order under condition.
SYN+ACK ' the reports that WAN TCP send in SYN ' the messages option and step 4 of WAN TCP transmissions in step 2
Selected works Xiang Zhongjun optimizes option comprising window factor option, enable selective retransmission option and WAN is expanded.
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 states are set to syn_sent, WAN TCP
State is set to syn_sent；In step 3 after agent client receives connection request message, WAN tcp states are set to
Syn_received, LAN tcp state are set to syn_received；Connected in step 6 after setting up, WAN TCP and LAN
Tcp state is set to established；Connected in step 7 after setting up, WAN TCP and LAN tcp states are set to
established。
The present invention is described in further details with reference to specific embodiment.
Embodiment
As shown in figure 1, agency is deployed on gateway, in intranet, with setting that client sets up that TCP is connected
Standby is proxy server；In another intranet, it is agent client to set up the equipment that TCP is connected with server；
It is wan environment between agent client and proxy server.
As shown in Fig. 2 agency is while with client communication in same LAN, another agency is logical in another side and wide area network
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 one, WAAS services are opened in proxy server and agent client, represent that TCP transmission needs to support wide area
Net accelerates function；And WAAS abilities are set for TFO/DRE/LZ, represent that proxy server and agent client support base
In the TCP agent function of wide area network compress technique, wide area network application service WAAS is intercepted to FTCP registrations and is driven and bind
Corresponding port；
Step 2, user end to server initiates connection, and agent client is to proxy server transmission source address and destination
Location is respectively the connection request message of client and server IP address, and carries out the option negotiation of request stage, FTCP
Intercept and capture user end to server send SYN messages, through FTCP resume modules after, will carry custom option SYN '
Message is sent to agent client, and reports socket_request events to WAAS applications；
Step 3, FTCP intercepts and captures the SYN+ACK messages that agent client is replied, and removal custom option is again by message
SYN '+ACK are sent to client；
Step 4, FTCP intercepts and captures the ACK messages that client sends, and ACK ' is sent into agency again after addition custom option
Client, and report data_ready events to WAAS；
Step 5, WAAS calls FTCP_Accept to get the current TCP handles for having completed connection foundation；
Step 6, FTCP intercepts and captures the data message that client sends, and data_ready is reported to WAAS
Event；
Step 7, WAAS reads data, then transfers to FTCP to send data；
Step 8, after data are processed through DRE/LZ, is sent to agent client；
Step 9, the data message that FTCP Intercept and capture services device sends to client reports data_ready events to WAAS；
Step 10, WAAS reads data, then transfers to FTCP to send data；
Step 11, data are sent to client through the contrary operation of DRE/LZ.
As shown in figure 3, the TCP connections (office that the TCP connections that the present invention sets up are included between client and proxy server
In the net of domain), TCP between proxy server and agent client connected (in wide area network) and agent client and service
TCP between device is connected (in LAN).
Proxy server and agent client are integrated in existing gateway, and the process of foundation is as follows：
Step one, according to network structure and application requirement, configures the configuration of each agent node, including the WAN of local terminal optimizes
Ability, the number of maximum client connection request and the maximum TCP numbers for completing connection；
Step 2, proxy server and agent client start listening port, monitor client connection；
Step 3, after startup, 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 messages；
Step 4, after proxy server receives request message, sets up WAN TCP Controls and LAN tcp loggings TCP letters
Breath, WAN TCP source addresses and destination address are respectively the source address and destination address of request message, and the source of LAN TCP
Address is respectively the destination address and source address of request message with destination address；Then RECONFIGURATION REQUEST message, adds local WAN
Optimization ability option, the original source address of message and destination address information is not changed, and be sent to agent client；
Step 5, after agent client receives request message, sets up WAN TCP Controls and LAN tcp loggings TCP letters
Breath, WAN TCP source addresses and destination address are respectively the destination address and source address of request message, and the source of LAN TCP
Address is respectively the source address and destination address of request message with destination address；Then RECONFIGURATION REQUEST message, removes WAN excellent
Change capability option, the original source address of message and destination address information are not changed, and be sent to proxy server；
Step 6, until connection is completed, proxy server and agent client are respectively provided with two connections to be set up state and is
The TCP connections of ESTABLISHED；
The present invention is illustrated with data transfer example below, data transfer includes connection procedure and interaction, wherein：
(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, optimizes option comprising local WAN, in proxy server
The state of two TCP is syn_sent；
Agent client sends connection request to server, and option, in agent client two are optimized not comprising local WAN
The state of individual TCP is syn_sent；
Server replys connection request response；
Agent client replys connection request response, and option, two TCP in agent client are optimized comprising local WAN
State be syn_received；
Proxy server replys connection request response, and option, two TCP in agent client are optimized not comprising local WAN
State be syn_received；
Client replys last response message；
Proxy server replys last response message, and option is optimized comprising local WAN, and connection is set up and completed, now
Tcp state is established；
Agent client replys last response message, and option is optimized not comprising local WAN, and connection is set up and completed, this
When tcp state be established.
(2) interaction is specific as shown in figure 4, comprising the following steps：
User end to server sends datagram；
Proxy server replys ACK messages to client；
Proxy server is sent to agent client after data message compression is processed；
The message that agent client will be received carries out decompression；
Agent client replys ACK to agent client；
Agent client is by the data is activation after data decompression to server；
Server replys ACK to agent client.
As shown in figure 5, simulating the WAN being connected with wide area network mouthfuls with three layers of mouth in gateway, simulated with two layers of mouth and office
LAN mouthfuls for being connected is netted in domain, under wan environment, Web page is carried out to system and accesses test.
Client accesses the website on Web server by proxy server and agent client, accelerates gateway deployment in generation
On reason two main frames of client and proxy server, three layers of mouth interconnection of three layers of mouth and agent client of proxy server,
Simulation wan environment；
It is Web page download time that Web page accesses test index；
Testing scheme：This test needs three files, is respectively that the RAR compressed packages of a 452.6MB size (are called in the following text
File A), a wmv video file (calling file B in the following text) for 43.1MB sizes, a TXT text for 18.2MB sizes
Presents (calls file C in the following text).
First carry out the step of reference of the three-wheel underlying transport test as follow-up test, test be tri- files of A, B, C by
Order is transmitted successively, is transmitted altogether twice；During test, often transmit a file and just record transmission after this document is transmitted
Time and average transmission rate；The test of this three-wheel underlying transport is respectively：
(1) original transmitted test：Under the system environments put up, any TCP agent is not started, by testing procedure
Tested；
(2) the underlying transport test based on the TCP agent for improving Transmission Control Protocol：Start transport layer optimization wide area network to accelerate
The TCP agent of technology, that is, open TFO functions, is tested according to testing procedure；
(3) the underlying transport test of the improvement TCP agent of wide area network data compression is combined：Start wide area network data compression
The TCP agent of technology, that is, open TFO/DRE/LZ functions, is tested according to testing procedure.
In order to avoid the randomness that system is brought, test result is the average value of multiple test result, as shown in table 1,
The table shows the download time for accessing Web page：
Table 1
From table 1 it follows that before deployment accelerates gateway, web page download time is more long.Deployment accelerates gateway obvious
Web page download time is reduced, improvement TCP agent method of this explanation based on wide area network data compression has in data transfer
There is efficiency of transmission higher.
Claims (4)
1. a kind of improvement TCP agent method based on wide area network data compression, in local area network, client and generation
Reason server connection, in target LAN, agent client is connected with server, it is characterised in that method including with
Lower step：
Step 1, based on wan environment, proxy server and client intercept driving event being locally registered；
Step 2, sent to the server in target LAN when the client that proxy server is listened in local area network
TCP connection requests, localling create a LAN TCP, and report connection request event to application layer；Then one is created
Individual WAN TCP corresponding with LAN TCP, constructs a new connection request SYN ' message, and send by WAN TCP
To agent client；
Step 3, sent to the server in target LAN when the client that agent client is listened in local area network
TCP connection requests, localling create a WAN TCP, and report connection request event to application layer；Then will request
WAN optimization options in message take common factor with local WAN optimization options, are stored in local；Finally, one and WAN are created
The corresponding LAN TCP of TCP, construct a new connection request SYN message, and be sent to server by LAN TCP；
Described WAN optimization options include in Transparent Proxy function, redundant data elimination function and data compression function
Plant or various, be stored in TCP message.
Step 4, when agent client receive server reply SYN+ACK messages, match local lan TCP；
Then corresponding WAN TCP are obtained, a new SYN+ACK ' message is constructed by WAN TCP, and be sent to
Proxy server；
After step 5, proxy server receive SYN+ACK ' messages, local WAN TCP are matched；Then by message
WAN optimization option and local WAN optimization options take commons factor, be stored in locally；Finally obtain corresponding LAN
TCP, a new SYN+ACK message is constructed by LAN TCP, does not carry local WAN optimizations option in message, concurrently
Give client；
Step 6, proxy server receive the ACK messages of client transmission, and local two TCP connections are set up and completed, to
Application layer reports DATA_READY events；Then new ACK ' messages are constructed, local WAN optimizations option is carried, is sent
To agent client；
Step 7, agent client receive the ACK ' messages of proxy server transmission, and local two TCP connections have been set up
Into reporting DATA_READY events to application layer；Then the WAN optimization options in message are optimized with local WAN and is selected
Item takes common factor, is stored in local；New ACK messages are finally constructed, local WAN optimizations option is not carried, be sent to clothes
Business device；So far, TCP agent connection is set up and is completed；
After step 8, connection are set up, the LAN TCP in proxy server receive client in local area network to mesh
The data message that server in mark LAN sends, forges ACK messages, is sent to client；Then application layer is notified
Read data；Finally, application layer calls data is activation interface, and agent client is sent the data to by WAN TCP；
WAN TCP in step 9, agent client receive client in local area network in target LAN
The data message that server sends, forges ACK messages, is sent to proxy server；Then notify that application layer reads data；
Finally, application layer calls data is activation interface, and server is sent the data to by LAN TCP；Communication process is completed.
2. it is according to claim 1 based on wide area network data compression improvement TCP agent method, it is characterised in that
Connection between client and proxy server, the connection between proxy server and agent client and agent client
Connection with server is TCP connections, the HTTP connections based on TCP or the FTP based on TCP are connected.
3. it is according to claim 1 based on wide area network data compression improvement TCP agent technology, it is characterised in that
Proxy server needs to be compressed data treatment before sending data with agent client.
4. it is according to claim 3 based on wide area network data compression improvement TCP agent method, it is characterised in that
Proxy server needs to carry out decompression to data after receiving data with agent client.
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| CN108833487A (en) * | 2018-05-23 | 2018-11-16 | 南京大学 | A kind of TCP transmission protocol agent method |
| CN109495388A (en) * | 2018-11-30 | 2019-03-19 | 四川安迪科技实业有限公司 | TCP accelerated method based on satellite communication |
| CN110740131A (en) * | 2019-09-30 | 2020-01-31 | 北京达佳互联信息技术有限公司 | Data processing method and device, electronic equipment and storage medium |
| CN112422396A (en) * | 2020-11-04 | 2021-02-26 | 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 |
| CN112637236A (en) * | 2020-12-31 | 2021-04-09 | 河南信大网御科技有限公司 | HTTP proxy method, architecture and medium for separating from protocol stack |
| 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 |
| 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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| WO2013055812A1 (en) * | 2011-10-14 | 2013-04-18 | Citrix Systems, Inc. | Systems and methods for dynamic adaptation of network accelerators |
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