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Content Delivery Networks (CDNs) are able to improve user-oriented application performance through caching and anycast routing or DNS-based user mapping mechanism. With the fact that BGP is widely used for inter autonomous system (AS) routing for CDNs, there is a middle mile bottleneck problem, which cause by the nature limitation of BGP. To solve this problem, we propose an SDN-based tunnel multi-path...
The exponential growth of internet traffic over the last twenty years presents a real challenge to ISP looking to ensure a reliable and efficient service to their customers. Network traffic is far from being straightforward to predict and a deep understanding of the routing domains is a first requirement to achieve proper management of the traffic. This paper focuses on the monitoring and characterisation...
Multimedia traffic is characterized by its sensitivity to both network delay and packet losses. In high-load non-dedicated networks, Quality of Service (QoS) must be guaranteed to multimedia traffic to achieve a minimum acceptable quality. This paper presents QoSApp, an OpenFlow-based application that dynamically manages the network-bandwidth to provide QoS guarantees to multimedia traffic, while...
In the last years, several projects are emerged with the aim to addressing the challenge of providing solutions for deployment, monitoring, adaptation, and management of clouds belonging to different enterprises/organisations. In such scenarios the network connectivity is one of the key factors. SDN technologies represent a good solution to face this challenge. Separating the control plane from the...
As network complexity and heterogeneity have increased dramatically in the last decade, modern policy-based management techniques for adaptive routing decisions regarding path selection optimization and intelligent path control are necessary. In this paper, we analyze the application performance requirements, and the event-based management options for adaptive routing. Then, we propose an innovative...
In Software Defined Networks (SDN), intensive traffic monitoring is used to optimize the Quality-of-Service (QoS) of the network paths which are selected. Thus, we introduce the use of the Cognitive Packet Network (CPN) algorithm to SDN in order to optimize the search for new high-QoS paths. We install the CPN algorithm in the Cognitive Routing Engine (CRE), a new application software for SDN, and...
Ad-hoc Networks are multi hop network in which there is no need of central administration. Each and every nodes in Ad-hoc networks act as router to send and receive data. It means cooperation among the nodes is important for establishing communication between sender and corresponding receiver. It is not necessary that each node act as a cooperative node, some nodes can intentionally act as uncooperative...
Software-Defined Networking (SDN) Architecture is relatively well defined, but the standards still need further development. Currently, working groups are developing Application Programming Interfaces (APIs) in which network monitoring is a priority, because it is the first step towards controlling a network. We present a network monitor that provides basic Quality of Service (QoS) parameters without...
In the last decades, along with the continuously evolving of the Internet Protocol-based network, numerous Internet programs that have played critical roles in the current technological era are being developed inclusive of interactive applications. Nevertheless, the transmission performance and user experience of these instant services that require high bandwidth or low latency may suffer when serious...
With the size and various applications of Internet growing, the structure and function of the network are becoming more and more complex, which makes it hard to be managed and controlled. The Internet has difficulty in providing QoS guarantees. Therefore, this paper proposes a controllable network architecture based on SDN[1]. In this architecture, "Q+ X" business guarantee mechanism is...
In compute clusters, monitoring of infrastructure and application components is essential for performance assessment, failure detection, problem forecasting, better resource allocation, and several other reasons. Present day trends towards larger and more heterogeneous clusters, rise of virtual data-centers, and greater variability of usage suggest that we have to rethink how we do monitoring. We...
This paper presents new Software Defined Networking (SDN) control framework for Quality of Service (QoS) provisioning. The proposed SDN controller automatically and flexibly programs network devices to provide required QoS level for multimedia applications. Centralized control monitors state of the network resources and performs smart traffic management according to collected information. Beside QoS...
We propose a new multi-domain networking paradigm where multiple broker agents compete to provide desirable inter-networking services to autonomous systems (ASes) through market-driven incentives. Broker agents with cognitive intelligence can adaptively offer end-to-end performance on a distributed platform involving ASes.
MANETs (Mobile Ad hoc Networks) are self organized networks with mobile and collaborating nodes without any pre-established infrastructure. Because of these characteristics, securing MANETs constitute a hard and challenging task. Consequently, new mechanisms may be of interest to secure such networks. To this end, we have found that trust management can be a support for MANET security. In fact, the...
To study Internet's routing behavior on the granularity of Autonomous Systems (ASes), one needs to understand inter-domain routing policy. Routing policy changes over time, and may cause route oscillation, network congestion, and other problems. However, there are few works on routing policy changes and their impact on BGP's routing behaviors. In this paper, we model inter-domain routing policy as...
Most routing protocols in vehicular networks are geared toward supporting safety applications. In this paper, we shift our attention to study if short-range communication (DSRC or WiFi) could also support real-time video streaming applications for moving vehicles. Rendering real-time video streaming in vehicular network is a challenging task, since video streaming applications tend to have stringent...
Wireless Mesh Networks (WMNs) are becoming increasingly popular and user demand for high-quality rich media services is continuously growing. Despite the fact that WMNs offer significant flexibility, they suffer in respect to Quality of Service (QoS) provisioning. This paper proposes a novel mechanism for providing enhanced QoS support to video services in multi-hop WMNs. The mechanism makes use of...
The consistent performance, energy efficiency, and reliability are important factors for real-time monitoring of a patient's data, especially in a hospital environment. In this paper a routing protocol is proposed by considering the Quality of Service requirements of the body area network data packets. A mechanism for handling delay-sensitive packets is provided by this protocol. Extensive simulations...
Delay tolerant networks (DTNs), which are wireless networks prone to long delays and frequent disruptions are increasingly becoming common. We are exploring the challenges involved in designing effective event notification framework on DTNs. This paper presents the design and evaluation of a delay-tolerant event notification framework called DATEM based on the philosophy that failures and delays are...
The availability of a dependable (i.e. reliable and timely) QoS monitoring facility is key for the real take up of cloud computing, since - by allowing organizations to receive the full value of cloud computing services - it would increase the level of trust they would place in this emerging technology. In this paper, we present a dependable QoS monitoring facility which relies on the "as a Service"...
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