Framework for throughput analysis of simple reliable multicast protocol in a M2MP network

M2MP has been developed to support M2MI applications in a mostly reliable wireless network. Currently, most M2MI/M2MP applications have been developed and tested in a reliable wired network. There has been a requirement to test the M2MP in a real world environment i.e. an unreliable proximal ad-hoc wireless network of mobile devices, where devices are constantly joining and leaving the network. Also, M2MP provides unreliable multicast service. There is a requirement to build and integrate a reliable multicast layer to the M2MP implementation to provide reliable multicast service. This Master s project aims to satisfy the requirements by building a framework to test a reliable M2MP implementation in a simulated unreliable network

Defined-trust Limited Domains

Defined-trust Limited Domains are a type of Limited Domain [RFC8799] where the rules specifying the (networked) communication of application information are defined in a communications schema that governs the information communicated in a particular Limited Domain. The schema includes the required format of information and specifies identities and the attributes that are required to legally construct a particular format. Application-local trust management enforces the schema which allows members of the domain to be “definite in what they accept” [LANG] and hence secure the Domain without a physical perimeter. All communications must be signed by a verifiable member identity. The schema specifies the format of the communications as well as the format of identity certificates and all signing rules are specified as a chain of trust that terminates at the trust anchor of the Domain. Non-conformant communications are detected and discarded early in the arrival process, preventing external information from entering the Domain. Encryption can be specified in the schema for privacy of Domain information. A Defined-trust Limited Domain may also be referred to as a Trust Domain or just Domain where the context is clear

Using reliable multicast for caching and collaboration within the world wide web

Journal ArticleThe World Wide Web has become an important medium for information dissemination. One model for synchronized information dissemination within the Web is webcasting in which data are simultaneously distributed to multiple destinations. The Web's traditional unicast client/server communication model suffers, however, when applied to webcasting; approaches that require many clients to simultaneously fetch data from the origin server using the client/server model will likely cause server and link overload. In this paper we describe a webcast design that improves upon previous designs by leveraging application level framing (ALF) design methodology. We build upon the Scalable Reliable Multicast (SRM) framework, which is based upon ALF, to create a custom protocol to meet webcast's scalability needs. We employ the protocol in an architecture consisting of two reusable components: a webcache component and a browser control component. We have implemented our design using a new SRM library called libsrm. We present the results of a simple performance evaluation and report on lessons learned while using libsrm

GRIDKIT: Pluggable overlay networks for Grid computing

A `second generation' approach to the provision of Grid middleware is now emerging which is built on service-oriented architecture and web services standards and technologies. However, advanced Grid applications have significant demands that are not addressed by present-day web services platforms. As one prime example, current platforms do not support the rich diversity of communication `interaction types' that are demanded by advanced applications (e.g. publish-subscribe, media streaming, peer-to-peer interaction). In the paper we describe the Gridkit middleware which augments the basic service-oriented architecture to address this particular deficiency. We particularly focus on the communications infrastructure support required to support multiple interaction types in a unified, principled and extensible manner-which we present in terms of the novel concept of pluggable overlay networks

Towards Scalable Web Documents

The current Web is running into serious scalability problems. The standard solution is to apply techniques like caching, replication, and distribution. Unfortunately, as the variety of Web applications continues to grow, it will be impossible to find a single solution that fits all needs. The authors advocate a different approach to tackling scaling problems. Instead of seeking a general-purpose solution, they argue that it makes more sense to look at each Web document separately. For each document, three issues need to be addressed: placement of replicas, required coherence, and best coherence protocol. The authors examine each of these issues, and identify the alternatives. However, forcing developers to decide on the best alternatives will turn the Web into an unworkable system. Therefore, a number of possible ways to reduce complexity is indicated. Also, the authors briefly discuss a wide-area infrastructure that can be used as a flexible basis for developing per-document solutions