Abstract: Data-intensive science projects rely on scalable, high-performance, fault-tolerant protocols for transferring large-volume data over a high-bandwidth, high-delay wide area network (WAN). The commonly used protocol for WAN data distribution is the GridFTP protocol. GridFTP uses encrypted sessions for data transfers and does not exchange any information with the network-layer resulting in reduced flexibility for network management at the site-level. We propose an application-aware software-defined networking (SDN) approach for providing differentiated network services for high-energy physics projects such as Compact Muon Solenoid (CMS) and Laser Interferometer Gravitational-Wave Observatory (LIGO). We demonstrate a policy-driven approach for differentiating network traffic by exploiting application- and network-layer collaboration to achieve accurate accounting of resources used by each project. We implement two strategies, a 7-3 queuing system, and a 10-3 queuing system, and show that the 10-3 strategy provides an additional capacity improvement of 11.74% over the 7-3 strategy.
Abstract— Security forms an important part of wireless network communication systems. A wide variety of attacks can be performed on IEEE 802.11 MAC thereby compromising the security of the system and also leading to degradation of the system performance. The security attacks can be classified into different categories based on criteria/nature of the attack, domain or attack techniques used. In this work we study the performance of IEEE 802.11 MAC with CSMA/CA systems under various jamming attacks. The study will comprise of simulation of jamming attacks and its effect on various system parameters like throughput, latency, offered load, etc.
Abstract: The use of Internet protocol suite of TCP/UDP in environments characterized by high delay and high link error rates result in significant degradation of the Protocol performance. The DTN bundle protocol can be used in such scenarios. Performance evaluation of delay-tolerant network bundle protocol in a live network is difficult due to the absence of networks characterized by extreme environs. Control on specific performance metrics like link delay, bandwidth, connectivity, traffic flow and queue sizes are thus rendered impossible without the incorporation of a control system either in software implementation or network hardware. The control over specific environments in real- world deployments and the analysis of the protocol deployment in the above provides an understanding into the performance of the bundling protocol in harsh networking environments. This paper presents the analysis and evaluation of performance of a delay-tolerant network in a virtual test platform setup.
Keywords: Internet, delays, transport protocols, Internet protocol, TCP/UDP, delay-tolerant network bundling protocol, scalable virtual network.
Abstract—Network Simulation is a predominant way of evaluating network performance of new routing algorithms and protocols. Discrete event simulation systems provide environments suitable for performance analysis. Dedicated simulation systems/small scale deployments of Delay-Tolerant Networks(DTN) are currently in use to explore the behavior and performance of Delay-Tolerant Networking Protocols and Architectures. The available simulation systems provide for varying system configurations at different levels of the protocol stack with the requirement for certain duplication/modification of the specified applications and protocols within the simulation environment. Also the simulation system depends on a flexible model of the developed system than the system itself. A real-world deployment discussed in  accommodates a link emulation system to provide a controlled environment for testing and analysis of Delay-Tolerant Networks. The development of a controlled test environment for deployment of a Delay-Tolerant Networking system requires significant infrastructure with complexities involving scalability and mobility. In this paper we present a scalable virtual networking test platform for deployment of delay-tolerant networks.
Abstract–The Internet Protocol Suite, although widely used in almost every application is ill-suited for use in communication systems characterized by unpredictable link reliability, intermittent network connectivity, very high round trip times (RTTs) and wide variations in data rates (also asymmetric). Challenges exist in the transfer of data between networks where the availability of an end-to-end path between the source and the destination may be absent. These issues are overcome by the use of Delay-Tolerant Networking (DTN) Architectures and Protocols. This paper presents the performance evaluation and analysis of such networks. The performance of DTN Bundling protocol is measured utilizing a variety of metrics under different network conditions and scenarios, thus providing a comprehensive characterization of such networks.
Abstract—Communication protocols today being extremely complex contain exhaustive definition and specification sets which need to be incorporated in the software implementations. As the information is difficult to comprehend, a visual model of the specifications provide a greater amount of clarity, thus leading to more efficient and bug-free implementations. A model driven approach to communication protocol design reduces significant development time and cost through automatic construction of the software from the visual design model. This paper presents a model driven architecture paradigm for design of Delay-Tolerant Network (DTN) Bundling Protocol. The design model formalism provides a well-defined structure which supports refactoring, event based modeling. The visual model also provides formalism for validation and verification of the design model. Models are designed using Object Management Group’s (OMG) model driven architecture core, Unified Modeling Language (UML). Furthermore, the protocol can be modeled using any language which supports state-transition semantics. The design can be modified to incorporate any of the four architectures suggested in the Bundle Protocol Specifications. Since UML is based on the object oriented methodology, translation of the state machines to the language of implementation is easily automated. The protocol interactions are modeled through the use of sequence and state diagrams This paper presents a methodology for designing and modeling the Delay Tolerant Network Bundling protocol. The methodology provides a common framework for use of the design with various suggested system architectural implementations. The automation in the implementation language also provides flexibility regarding the choice of the language itself.