1,387 research outputs found
Issues in providing a reliable multicast facility
Issues involved in point-to-multipoint communication are presented and the literature for proposed solutions and approaches surveyed. Particular attention is focused on the ideas and implementations that align with the requirements of the environment of interest. The attributes of multicast receiver groups that might lead to useful classifications, what the functionality of a management scheme should be, and how the group management module can be implemented are examined. The services that multicasting facilities can offer are presented, followed by mechanisms within the communications protocol that implements these services. The metrics of interest when evaluating a reliable multicast facility are identified and applied to four transport layer protocols that incorporate reliable multicast
Issues in designing transport layer multicast facilities
Multicasting denotes a facility in a communications system for providing efficient delivery from a message's source to some well-defined set of locations using a single logical address. While modem network hardware supports multidestination delivery, first generation Transport Layer protocols (e.g., the DoD Transmission Control Protocol (TCP) (15) and ISO TP-4 (41)) did not anticipate the changes over the past decade in underlying network hardware, transmission speeds, and communication patterns that have enabled and driven the interest in reliable multicast. Much recent research has focused on integrating the underlying hardware multicast capability with the reliable services of Transport Layer protocols. Here, we explore the communication issues surrounding the design of such a reliable multicast mechanism. Approaches and solutions from the literature are discussed, and four experimental Transport Layer protocols that incorporate reliable multicast are examined
The multidriver: A reliable multicast service using the Xpress Transfer Protocol
A reliable multicast facility extends traditional point-to-point virtual circuit reliability to one-to-many communication. Such services can provide more efficient use of network resources, a powerful distributed name binding capability, and reduced latency in multidestination message delivery. These benefits will be especially valuable in real-time environments where reliable multicast can enable new applications and increase the availability and the reliability of data and services. We present a unique multicast service that exploits features in the next-generation, real-time transfer layer protocol, the Xpress Transfer Protocol (XTP). In its reliable mode, the service offers error, flow, and rate-controlled multidestination delivery of arbitrary-sized messages, with provision for the coordination of reliable reverse channels. Performance measurements on a single-segment Proteon ProNET-4 4 Mbps 802.5 token ring with heterogeneous nodes are discussed
Flexible TDMA/WDMA passive optical network: energy efficient next-generation optical access solution
Roaming Real-Time Applications - Mobility Services in IPv6 Networks
Emerging mobility standards within the next generation Internet Protocol,
IPv6, promise to continuously operate devices roaming between IP networks.
Associated with the paradigm of ubiquitous computing and communication, network
technology is on the spot to deliver voice and videoconferencing as a standard
internet solution. However, current roaming procedures are too slow, to remain
seamless for real-time applications. Multicast mobility still waits for a
convincing design. This paper investigates the temporal behaviour of mobile
IPv6 with dedicated focus on topological impacts. Extending the hierarchical
mobile IPv6 approach we suggest protocol improvements for a continuous
handover, which may serve bidirectional multicast communication, as well. Along
this line a multicast mobility concept is introduced as a service for clients
and sources, as they are of dedicated importance in multipoint conferencing
applications. The mechanisms introduced do not rely on assumptions of any
specific multicast routing protocol in use.Comment: 15 pages, 5 figure
A Secure Key Agreement Protocol for Dynamic Group
To accomplish secure group communication, it is essential to share a unique
cryptographic key among group members. The underlying challenges to group key
agreement are scalability, efficiency, and security. In a dynamic group
environment, the rekeying process is more frequent; therefore, it is more
crucial to design an efficient group key agreement protocol. Moreover, with the
emergence of various group-based services, it is becoming common for several
multicast groups to coexist in the same network. These multicast groups may
have several shared users; a join or leave request by a single user can trigger
regeneration of multiple group keys. Under the given circumstances the rekeying
process becomes a challenging task. In this work, we propose a novel
methodology for group key agreement which exploits the state vectors of group
members. The state vector is a set of randomly generated nonce instances which
determine the logical link between group members and which empowers the group
member to generate multiple cryptographic keys independently. Using local
knowledge of a secret nonce, each member can generate and share a large number
of secure keys, indicating that SGRS inherently provides a considerable amount
of secure subgroup multicast communication using subgroup multicasting keys
derived from local state vectors. The resulting protocol is secure and
efficient in terms of both communication and computation.Comment: This article is accepted for the publication in Cluster Computing-The
Journal of Networks, Software Tools and Applications. Print ISSN 1386-7857,
Online ISSN 1573-754
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