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OSPF is one of the routing protocols which is the most widely used in internet and intranet today. The link-state algorithm in OSPF is based on the thought of local optimization, but in certain cases, routing algorithms based on local optimization might lead to a disadvantage which will remarkably depress global performances. A self-adaptive method based on the genetic algorithm is proposed, which...
In this paper we propose a Packet-based measurement technique called Floating IP Active Measurement (FIPAM) that utilizes routing loop to measure Delay and Throughput in IP networks. Calculating these parameters in multi-provider and complex networks like Internet has became a challenge as most of current active measurement tools relying on ICMP and majority of today's networks block ICMP traffics...
The poor performance of TCP, designed about 30 years ago, over high bandwidth-delay product connections has attracted much attention in the past few years. Some research work attempt to solve this problem by using innovative window estimations. The bursty nature of packet transmission has compounded the challenges in the problem. In this paper, we propose a new transmission protocol - Fairness Control...
To enable seamless integration of ad hoc networks with other Infrastructure LANs and to the Internet, TCP seems to be the natural choice for users of ad hoc networks that want to communicate reliably with each other and with the Internet. It is well-known that due to the nature of multi-hop wireless Ad hoc network applications, TCP throughput instability can have a devastating impact on the QoS requirements...
Base on the QOS requirements of modern broadband networking, the paper presents our recent research on QOSPF in the on-demand computing over the traditional OSPF. The disadvantage in a distributed routing protocol under the QOS requirement is firstly discussed; then a new QOSPF which supports the QOS routing scheme is proposed. The advantage of new approach is demonstrated in the simulation of OSPF...
In this paper is introduced a FSC (Fuzzy Service Classification) algorithm. The algorithm adaptively changes weight coefficients that determine the amount of allowed bandwidth for each service class in the outputs of routers. New weight coefficients are calculated periodically on routers. The proposed fuzzy model simplifies the link sharing to two service classes: one for UDP and another for TCP....
There is a growing need to support real-time applications over the Internet. Real-time interactive applications often have multiple quality-of-service (QoS) requirements which are application specific. Traditional provisioning of QoS in the Internet through IP routing - Intserv or Diffserv - faces many technical challenges, and is also deterred by the huge deployment issues. As an alternative, application...
The average link utilization at the backbone of Internet is less than 10%. But the bandwidth that users can experience is very limited. Researchers find the switching capability of metropolitan area networks (MAN) is the major bottleneck. This paper adopts the multi-path self-routing switching structure as the switching fabric, which is interconnected by multistage sorting concentrators. With its...
As wireless local area networks (WLAN) become ubiquitous and an integral part of data networks, they will also be increasingly used for applications ranging from standard Internet services like ftp to time bound multimedia applications, such as Voice (or Video) over IP (VoIP/VIP), HDTV etc. with strict latency, throughput or jitter restrictions. These applications on WLAN will also be more bandwidth...
This paper presents an evaluation of the quality of Service Signalling Layer Protocol (QoS-NSLP) of the NSIS (next steps in signalling) protocol suite. The QoS-NSLP in combination with the NSIS Transport Layer Protocol (NTLP) is proposed by the Internet Engineering Task Force (IETF) as an alternative to the Resource reSerVation Protocol (RSVP). We describe our implementations of the software architecture,...
The past few years have seen researchers debate the size of buffers required at core Internet routers. Much of this debate has focused on TCP throughput, and recent arguments supported by theory and experimentation suggest that few tens of packets of buffering suffice at bottleneck routers for TCP traffic to realise acceptable link utilisation. This paper introduces a small fraction of real-time (i...
This paper describes the security features of Real time Transport Protocol features like confidentiality, integrity and authentication. The main goal of this research is the confidentiality to provide security to data, authentication which identify legal users, and optimization of multiple paths for Quality of Service (QoS). In multimedia application it is expected that the router should be able to...
A plethora of packet-scheduling algorithms have been proposed in the literature in order to meet the stringent time constraints of real time flows at an IP router level. In this regard, the so-called EDF algorithm attracted special attention since it is prominent for optimally managing flows with strict time constraints. However, EDF is complex and expensive as far as implementation is concerned,...
CHART seeks to improve the performance of operational DoD Internets through the introduction of an intelligent network overlay. TCP performance-particularly between CONUS and forward-deployed components located in combat theaters-can be severely degraded due to high loss rates and long latencies. The lack of current information about network conditions in the core NIPR-net/SIPRnet further compounds...
A major challenge in the Internet is to deliver live video content with a good quality to large number of heterogeneous receivers. Layered multicast is a promising solution to accomplish this task efficiently. However, schemes using it suffer from slow convergence time, lack of inter-session fairness and TCP-friendliness, and considerable losses induced by slow response; and failed join-experiments...
The transmission control protocol (TCP) is the dominant transport layer protocol for the end-to-end control of information transfer. Accurate models of TCP performance are a key and basic step for designing, dimensioning and planning IP (Internet Protocol) networks. Packet-level simulation models do not scale with the growth of network capacities and number of users. Measurements can only be used...
Conventionally, many researchers and experts are only focused on studies of routing protocol over the MANET. Currently, the pervasion of Internet applications causes TCP as the standard transmission protocol for most of the networking applications. For the reliable packets delivery, TCP can support the mechanisms of flow and congestion control. Due to the unconstrained movement of the mobile nodes,...
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