VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T17:44:57ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2020-07-10T05:48:34Z2020-07-13T10:18:55Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3999This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/39992020-07-10T05:48:34ZA Way to Estimate TCP Throughput under Low-Rate DDoS Attacks: One TCP FlowTCP-targeted low-rate distributed denial-of-service (LDDoS) attacks were first introduced by A. Kuzmanovic and E. Knightly in 2003. The authors also proposed a simple model to quantify TCP throughput under LDDoS attacks. Since then, there have been many researchers attemping to estimate the throughput, such as Luo et al. We agree with them upon the sketch of TCP congestion window under a successful LDDoS attack but we find out that there are more cases than what has been specified. Moreover, the relative error of Luo’s estimation method is still high. Our goal in this paper is to propose a simple but more accurate method to estimate TCP throughput of a single TCP flow under such DDoS attacks. Our estimation values in various scenarios are compared with the results of simulations performed with NS-2 simulator, so that the effectiveness of our method is illustrated.Minh Viet Kieu15028023@vnu.edu.vnDai Tho Nguyennguyendaitho@vnu.edu.vnThanh Thuy Nguyennguyenthanhthuy@vnu.edu.vn2018-06-14T07:10:21Z2018-06-14T07:10:21Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2229This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/22292018-06-14T07:10:21ZTCP Enhancements and Performance over Networks with Wireless LinksTransmission Control Protocol (TCP) uses end-to-end flow, congestion, and error control mechanisms to provide reliable delivery over the Internet. During many years of extensive use in inter-networks, all weak-points of TCP are discovered and tuned, so that it performs very well in traditional network (wired network). However, inter-networks growth explosively and may consist of networks with wireless links
characterized by high and sporadic bit error rate and intermittent connectivity due to handoff. TCP performance
is degraded severely in such networks. Many studies have been carrying out to improve the performance of TCP in networks with wireless links. Some solutions are proposed and implemented.
This paper presents four main issues: Congestion avoidance and control mechanisms implemented in traditional TCP protocol; Step-by-step enhancements in traditional TCP; Characteristics of wireless links degrade TCP performance severely; and mechanisms to enhance TCP performance over network with wireless links.Dinh Viet Nguyenvietnd@vnu.edu.vn2018-06-14T07:03:27Z2018-06-14T07:03:27Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2228This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/22282018-06-14T07:03:27ZSo sánh hiệu suất của các kế hoạch kiểm soát lỗi trong mạng truyền thông máy tínhThis paper analyzes quantitatively link-by-link and end-to-end error control schemes in computer communication networks. Two measures used for performance evaluations are mean packet delay time and throughput of the networks. With two specific examples, performance comparisons are made for two cases: traditional computer networks (low-speed) and high-speed (gigabit/sec) computer networks. The results is that: link-by-link error control scheme is superior than end-to-end error control scheme for low-speed computer networks, by contrast, for high-speed computer networks end-to-end scheme is superior than link-by-link scheme.Dinh Viet Nguyenvietnd@vnu.edu.vn2018-06-14T07:01:56Z2018-06-14T07:01:56Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2227This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/22272018-06-14T07:01:56ZSimulation-based Evaluation of Performance of a Snoop TCP Scheme over Networks with Wireless LinksTCP is a transport protocol designed and tuned to work well in fixed networks, however TCP performance is degraded severely in a network with wireless links. To enhance TCP performance in such networks, some proposals have been made in the last several years. Among them Snoop TCP proposal is one of the most important ones. Our paper investigates the effect of various error rates of wireless link on the performance of snoop TCP; normal TCP is also put to our investigation to make a comparison. We use the network simulator ns-2, version 2.1b9 extensively. Our simulation results show that in comparison with normal TCP, snoop TCP enhances normalized throughput of LAN and WAN with wireless link 137% and 427% respectively.Dinh Viet Nguyenvietnd@vnu.edu.vn