Discussion on application of WAN optimization technology in petroleum industry

The information construction of petroleum industry has developed rapidly in recent years, and there are up to dozens of kinds of systems including OA, mail, video conferencing and professional application system.  And the enterprise that carries these businesses internal wide area network mostly uses the special line way with each subordinate branch organization to carry on the networking, for some limited well field as well as some overseas branches also uses the satellite to carry on the networking. Enterprise's reliance on information is more and more high, the internal application system and the data load is more and more, and the network of the Green Line and satellite is often limited by the bandwidth and the quality of the net, and the cost of increasing the bandwidth is also very high. How to optimize the link of WAN, and realize more efficient transmission of various application systems and data under the limited bandwidth and quality of WAN, has very practical significance.  With the rapid development of WAN optimization technology in recent years and the maturing of its technology, this paper probes into the characteristics of WAN optimization technology combined with the information of petroleum industry. WAN optimization technology was first introduced in 2004, this technology mainly uses the data caching technology, TCP protocol and Application Protocol optimization, flow analysis and optimization technology to improve and optimize WAN data transmission of the speed problem faced: 1 data caching technology This technology is not a simple file cache, Instead, the packets transferred in the WAN are split into smaller "fragments" by a certain algorithm, and assign a unique label to the fragment, storing the fragment and label separately in the local device and destination receiving device, transferring only "tags" to the destination when the same "label" content needs to be transferred again,  The receiving device extracts content from the local device according to the label. 2 TCP protocol optimization and application optimization TCP protocol was proposed in the 70 's, in which the sliding window, slow start algorithm and congestion avoidance algorithm have better transmission effect under the network conditions. But with the rapid development of the Internet, many algorithms have become the bottleneck of network transmission rate under the current network conditions.  For example, the test shows that the network delay to a certain degree of network transmission rate has a very large impact, see the following figure.  Other network applications in the LAN access speed is very good, but because of its transmission mechanism to the Internet after the delay, packet loss after the impact of its access speed will be very big impact.  The WAN optimization equipment (both ends deployment) can optimize the window sliding mechanism, the window size and the protocols of some application systems to achieve higher network utilization and transmission speed.  3 flow analysis and optimization through the network of traffic in the Application Protocol analysis, and according to the importance of the application and the requirements of real-time networks to different priority levels for the dynamic allocation of bandwidth. The wide area network of petroleum industry is characterized by wide geographical distribution, many kinds of bearing applications and large data carrying capacity, and the wide Area network optimization technology canWide area Network application traffic for effective optimization and processing, mainly to solve a few aspects of the problem: 1 line link Optimization: Limited bandwidth, if the load will cause network congestion and then appear network delay increase, network loss packet phenomenon, through the WAN data caching technology can reduce the network load in the line To avoid congestion.  In addition, some WAN optimization products can reduce the packet loss rate through packet redundancy technology, which will help to improve the effect of video conferencing or VoIP. This data reduction application will bring great convenience to seismic data transmission analysis for the large amount of seismic wave data transmission inside the petroleum system. Because of the large amount of data and the long access time of the network transmission, the traditional seismic wave data can be brought back to the analysis by the human by the hard copy.  After the wide-area network optimization data reduction technology can be popularized and applied, it will be able to effectively improve data transmission efficiency and improve the efficiency of seismic data  analysis. 2 application system and data transmission speed: Through the data caching technology and protocol optimization technology can make the application system access and data transmission in the inherent dedicated line bandwidth of access faster. In the test deeply convinced by the technology to provide the WAN optimization equipment process, found that the WAN Optimization device acceleration effect is very obvious, or even more than the original physical bandwidth many times, the specific test data are as follows: in the 4M wide-area network under the conditions of access speed comparison: a) OA Office system Access test  The use of HttpWatch grab package in the use of wide-area network to optimize the acceleration function after the opening of the internal oil Group portal site speed increased significantly. b Internal File open speed Test (b/s structure, download internal word and PDF file in the test process, after opening the WAN Optimization acceleration feature, multiple document opening speed increased significantly, and in the first open when there is a significant acceleration, which also indicates that WAN acceleration is not the way to use file caching, Instead, it uses a caching method based on packet fragmentation.  And can see the WAN optimization adopt the transmission "label" way, so that the actual data throughput of both ends of the line (708kb/s*8=5664bps≈5.5mbps,3413.3kb/s*8=26.7mbps) far more than the 4Mbps of the theoretical bandwidth of the line. 3 Bandwidth dynamic allocation guarantee core application: The current internal dozens of kinds of applications of the importance of the network real-time requirements are not the same, in addition to using the above optimization means, through the protocol analysis and internal application system of the flow analysis, through the internal video conferencing, Video monitoring and other real-time requirements of high application and some important business systems to provide high priority.  Other application systems can still guarantee access quality through the above two optimization methods. Nowadays, WAN optimization technologyForeign applications have been very common, many of the world's top 500 enterprises have been deployed WAN optimization solutions, and at present in the domestic wide-area network optimization technology application has just started, in this article I only based on the Sichuan-Qing drilling own WAN construction experience in conjunction with WAN optimization technology How to solve the problem, For the vast number of peer together for some discussion.