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Many techniques are commonly used to increase server availability or for distributing the load among a group of servers. We propose a technique for splitting a single HTTP request that allows a TCP connection to be dynamically split between two Web servers without using a central control. For example, one server can handle connection establishment and closing, while another handles the data transfer...
The web is a crucial source of information nowadays. At the same time, web applications become more and more complex. Therefore, a spontaneous increase in the number of visitors, e.g., based on news reports or events, easily brings a web server in an overload situation. In contrast to the classical model of distributed denial of service (DDoS) attacks, such a so-called flash effect situation is not...
In this paper, the embedded web server, which take Samsung corporation's ARM9-S3C2440AL processor as core, is designed, it's operating system is Linux, the system hardware architecture is presented. Then the process of the Linux operating system being transplated on ARM is introduced. The realization of Boa and dynamic interaction between browser and the embedded system by using CGI are especially...
In this paper, we have designed and implemented a kernel-level Web-based QoS (WQoS) mechanism that could efficiently support differentiated services when serving multiple diverse types of Web requests in a cluster-based Web server system. Our mechanism is implemented at kernel level to effectively reduce the number of protection domain switches and data copying between kernel space and user space...
Remote controlling of devices or peripherals interfaced with an MCU is essential in couple of applications in Embedded Systems. Web Server is one of the best solutions to do such task if internet is available at such remote locations. The important aspect of this paper is to port an open source Embedded Linux operating system on the FPGA to manage the hardware resources. It is pre-emptible and can...
This paper designs a powerful Web-based gateway for the on-site monitoring equipment network composed by RS-485, CAN and other communication protocols, thus to bridge between them and the Internet, allowing remote users can browse and manage these on-site monitoring equipments through browser anytime and anywhere. It also describes a method to optimize the network module based on applications, introduces...
Virtual machine monitor provides the drastic improvement of isolation, consolidation and flexibility in running virtual machine. Also, virtual cluster becomes one of the hot topics for the combination of capacity planning, HPC (high performance computing) and virtualization technologies. In this paper we propose a dynamic protection system of Web server in virtual cluster using live migration. VMM...
The faultload is one of the most critical components of a dependability benchmark. It should embody a repeatable, portable, representative and generally accepted fault set. Concerning software faults, the definition of that kind of faultloads is particularly difficult, as it requires a much more complex emulation method than the traditional stuck-at or bit-flip used for hardware faults. Although faultloads...
With the explosive growth of the network, the workload on the servers is increasing rapidly so that servers will be easily overloaded for a short time. Linux virtual server (LVS) project which is an open source project overcomes the overloading problem of the servers. The three implemented ways of the virtual server is introduced. A LVS cluster of Web servers based on VS/DR is presented for an online...
The bloom of Internet and the convenience of e-Commerce bring a lot of demands of Internet booking applications. There are two challenges in Internet Booking Applications: high volume concurrent processing and complex business processing. Facing these two challenges, we designed an extensible framework for Internet booking applications, which includes an Internet Booking Engine, a rule engine, and...
In this paper, we propose a new data acquisition system based on embedded operation system which can be used to supervise the system remotely. The processor S3C44B0X, which used to data collection and storage, is as the control kernel of the system. The system adopt the uCLinux multi-task operation system. The system have many advantages,such as high quality of real-time, friendly interface, controlling...
Remote control network is a research focus in the application domain of wireless communication technology. Zigbee technology makes up for the vacancy of wireless communication market in the low-cost and low-power equipment domain. This paper presents the design and application of wireless sensor network web server based on S3C2410 and Zigbee protocol. This server can realize real-time motoring and...
Current Web servers are highly multithreaded applications whose scalability benefits from the current multi-core/multiprocessor trend. However, some workloads cannot capitalize on this because their performance is limited by the available memory and/or the disk bandwidth, which prevents the server from taking advantage of the computing resources provided by the system. To solve this situation we propose...
Computer forensics aimed at determining the relevant causes and effects between the present state of computer system and malicious operation through the measures which could be adopted on the court. This paper proposes an intrusion forensics worked on a WEB server. The forensics system monitor the access to the log files and combine it with the timestamp and other clues in the log file, thus comprehensive...
Effective defenses against DDoS attacks that deplete resources at the network and transport layers have been deployed commercially. Therefore, DDoS attacks increasingly use normal- looking application-layer requests to waste server CPU or disk capacity. CAPTCHAs attempt to distinguish bots from human clients and are often used to avoid such attacks. However, CAPTCHAs themselves consume resources and...
LinuxDirector is a software tool that directs network connections to multiple servers that share their workload, which can be used to build highly scalable and highly available services. LinuxDirector extends the TCP/IP stack of the Linux kernel to support three IP load balancing techniques, which can make parallel services of different kinds of server clusters to appear as a service on a single IP...
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