Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Modified RED algorithm to improve the performance of web traffic(2013) Dadhania, M.K.; Kumar, K.V.Reducing the delay of web traffic has been an important issue in Internet works. However, it is difficult to reduce delay while improving throughput. This is because, in order to reduce delay queue size should be less but to improve throughput queue size should be more. In our modification, web traffic and ECN marked packets are dropped only when high congestion occurs at router. We propose a solution to improve response time as well as the number of packets transmitted of web traffic without affecting throughput of bottleneck link. We applied this solution to RED algorithm and tested the performance and efficiency of modified RED algorithm as compared to the original RED algorithm. © 2013 IEEE.Item On the effectiveness of CoDel for active queue management(2013) Raghuvanshi, D.M.; Annappa, B.; Tahiliani, M.P.Internet in the present scenario has become a gigantic source of information. There has been a tremendous rise in the variety of Internet applications, with each application demanding a specific performance criteria to be satisfied. Routers presently use Passive Queue Management (PQM) mechanisms and hence, merely have any control over the queue occupancy. Therefore, there has been an increased interest in exploring Active Queue Management (AQM) in Internet routers so as to reduce the queue latency and meet the demands of time sensitive applications. In this paper, we mainly focus on analyzing the effectiveness of a recently proposed AQM mechanism called Controlled Delay (CoDel). We study the effectiveness of CoDel by carrying out simulations in ns-2 and comparing its performance with existing AQM mechanisms in variety of Internet scenarios. Based on the simulation results obtained, we discuss the advantages and shortcomings of CoDel in terms of bottleneck link utilization, mean queue length and packet drop rate. © 2013 IEEE.Item Analysis of cautious adaptive RED (CARED)(2013) Tahiliani, M.P.; Shet, K.C.Internet in the present scenario has become a gigantic source of information. There has been a tremendous rise in the variety of Internet applications with each application demanding a specific performance criteria to be satisfied. Routers presently use Passive Queue Management (PQM) mechanisms and hence, merely have any control over the queue occupancy. Therefore, there has been an increased interest in exploring Active Queue Management (AQM) in Internet routers so as to reduce the queue latency and meet the demands of time sensitive applications. In this paper, we mainly focus on analyzing the AQM mechanism which we proposed recently, named Cautious Adaptive Random Early Detection (CARED). We study the effectiveness of CARED by carrying out simulations in ns-2 and comparing its performance with Adaptive RED (ARED) and Refined Adaptive RED (Re-ARED) in a wide variety of Internet scenarios. Based on the simulation results obtained, we highlight the advantages of CARED in terms of throughput, packet drop rate and the stability of the average queue size. © 2013 IEEE.Item Comparative analysis of queue mechanisms with respect to various traffic in wired-cum-wireless network(Institute of Electrical and Electronics Engineers Inc., 2014) Dhadse, J.S.; Chandavarkar, B.R.Current Active Queue Management (AQM) and TCP are designed to work well for wired networks where packet loss is mainly due to network congestion. In wired cum wireless networks, however, wireless bandwidth is much smaller than the wired network and at base station packet loss occurs due to bottleneck wireless link. As a result, the performance of TCP flows is significantly degraded. To overcome this problem, Base Station (BS) is the key point for performance enhancement in wired-cum-wireless network. There is need of AQM at base station which stabilize the system and achieve low delay, low packet loss, and high link utilization regardless the dynamic of network conditions. To study the behavior of Queue at base station, we carry out simulation of wired-cum-wireless network with respect to various traffics (Background, streaming, conversational) in ns-2. © 2014 IEEE.Item Performance evaluation of CoDel for active queue management in wired-cum-wireless networks(Institute of Electrical and Electronics Engineers Inc., 2014) Jain, T.; Annappa, B.; Tahiliani, M.P.Internet is the major source of information today and its usage is increasing at an alarming rate. A wide variety of data travels over the Internet to cater the needs of end users. This has eventually led to heavy congestion in the network which in turn, worsens the user perceived latency. Internet routers are the main agents that detect congestion prior to end hosts. Traditional router incorporates Passive Queue Management (PQM) strategies which fail to control congestion. Moreover, PQM has several drawbacks which drew the attention of researchers towards the evolution of Active Queue Management (AQM). AQMs are designed to effectively avoid congestion at network routers. AQM apparently became very popular for wired networks, but there are very few researches to find their effectiveness over wireless networks. In this paper we evaluate the effectiveness of a recently proposed AQM mechanism called Controlled Delay (CoDel) in wired-cum-wireless networks. Simulations are carried out by using ns-2 and CoDel's performance is compared with that of Random Early Detection (RED) and Droptail. © 2014 IEEE.Item Extended ECN mechanism to mitigate ECN-based attacks(Institute of Electrical and Electronics Engineers Inc., 2014) Bommisetti, S.; Annappa, B.; Tahiliani, M.P.Today, usage of internet is growing exponentially. Congestion detection and avoidance algorithms are the major issues in TCP/IP. Earlier, packet drops are only source of congestion indication, but it leads to loss of throughput. Active Queue Management (AQM) can detect congestion before the queue overflows and informs the end hosts to respond congestion. It allows gateways to drop packets when average queue is greater than maximum threshold and marks the packets otherwise. Explicit Congestion Notification (ECN) mechanism marks the packets when the average queue size is between predefined thresholds and improves the throughput of a network. But it depends on the end hosts to respond to congestion. So there is a possibility of misbehavior by sender to increase its congestion window, even if the receiver correctly signals about congestion. So misbehaving ECN sender flow obtains more throughput than the normal ECN-enabled flows. We present an Extended ECN mechanism that enables a router to mark packets and the receiver to signal congestion to the sender without trusting the sender whether it has responded congestion or not. Our improved mechanism is robust in detection and prevention of this misbehaving sender in network and compatible with ECN and TCP/IP mechanisms. © 2014 IEEE.Item Revisiting TCP outcast problem using DCTCP in data center networks(Institute of Electrical and Electronics Engineers Inc., 2015) Patidar, A.; Tahiliani, M.P.Data Center Networks (DCNs) today are used to compute and store the data of multiple users because of low cost, flexibility and availability. In this multi-tenant cloud environment, resources are shared among different users. Suppose two users fetch data at same time from the same DCNs, one fetches small amount of data (like web search) while another user fetches larger amount of data (like software update). If these large set of flows and small set of flows arrive at two different input ports of a switch and compete for same output port, then large flow packets get the buffer while small flow packets are dropped consecutively. This issue occurs due to drop tail implementation of queue in switches and as one set of flows is outcast by other, the problem is known as TCP Outcast. While a few studies have already explored the TCP Outcast problem, this paper aims to revisit this problem by using DCTCP in DCNs. The experiments carried out using Mininet show that DCTCP solves the problem of TCP Outcast by ensuring fairness for all types of flows. © 2015 IEEE.Item BCON: Back pressure based congestion avoidance model for Named Data Networks(Institute of Electrical and Electronics Engineers Inc., 2017) Agarwal, A.; Tahiliani, M.P.Queue management in Named Data Networks (NDN) has gained a lot of attention recently. Unlike the traditional IP architecture, the transport mechanism in NDN is intricate and comprises of in-network caching of data packets at routers. Hence, the most effective avoidance of congestion can occur at the routers itself. In this paper, we make two contributions: first, we propose a back pressure based congestion avoidance model for NDN which leverages the benefits of Active Queue Management (AQM) mechanisms. Using this model, we apply the existing AQM mechanisms like Random Early Detection (RED), Adaptive RED (ARED), Controlled Delay (CoDel) and Proportional Integral controller Enhanced (PIE) in NDN. Second, we study the effectiveness of our proposed model by performing simulations using ndnSIM. Our simulation results indicate that the proposed model successfully balances the tradeoff between link utilization and Data drop rate. © 2016 IEEE.Item Situation-Based Congestion Control Strategies for Wired and Wireless Networks(Institute of Electrical and Electronics Engineers Inc., 2018) Kharat, P.; Kulkarni, M.Performance of transport layer is measured mostly in terms of packet delivery ratio, transmission delay, and throughput. Congestion control (CC) strategies are responsible for transport layer performance. There are different congestion control algorithms are designed and developed by researchers to handle shared, highly distributed and heterogeneous environment. In this paper, we are analyzing most of the popular congestion control algorithms based on link state, type of traffic, mode of transmission and bandwidth delay product (BDP). In the proposed algorithmic solutions, networking researchers not only looking for congestion but also taking care of effective use of network resources in different types of environments such as wired, wireless, high-speed, long-delay, etc. To avoid severe congestion based on feedback mechanism few packets are dropped randomly by using active queue management (AQM) techniques. Using explicit congestion notification (ECN) mechanism unnecessary packet dropping is avoided. Data center network (DCN) uses a different approach to handle congestion. © 2018 IEEE.