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1915 research outputs found
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End-site Routing Support for IPv6 Multihoming
Full text linkMultihoming is currently widely used to provide fault tolerance and traffic engineering capabilities. It is expected that, as telecommunication costs decrease, its adoption will become more and more prevalent. Current multihoming support is not designed to scale up to the expected number of multihomed sites, so alternative solutions are required, especially for IPv6. In order to preserve interdomain routing scalability, the new multihoming solution has to be compatible with Provider Aggregatable addressing. However, such addressing scheme imposes the configuration of multiple prefixes in multihomed sites, which in turn causes several operational difficulties within those sites that may even result in communication failures when all the ISPs are working properly. In this paper we propose the adoption of Source Address Dependent routing within the multihomed site to overcome the identified difficulties.TRUEpu
End-to-end Delay Analysis and Admission Control in 802,11 DFC WLANs
Full text linkIn this paper, we first present an analytical model to study the distribution of the backoff delay in an 802.11 DCF WLAN under saturation conditions. We show that, with our method, the probability that the backoff delay is below a given threshold can be computed accurately and efficiently. Then, we extend our backoff delay distribution model to analyze the end-to-end delay, and propose an admission control
algorithm based on this analysis. The proposed algorithm is evaluated in a mixed environment with voice and data stations, and simulation results confirm that it effectively provides voice stations with end-to-end delay guarantees. The algorithm is also evaluated in terms of computational cost and shown to be efficient enough for run-time usage.TRUEpu
Pasarela residencial multiservicio con soporte de calidad garantizada para acceso de banda ancha
Full text linkHabitualmente se considera que un acceso de banda ancha que proporciona una gran capacidad de transmisión tanto a entornos de negocio como a entornos residenciales, es suficiente como para distribuir servicios avanzados de calidad. Sin embargo ni las redes de acceso están aún lo suficientemente evolucionadas como para soportar todom tipo de servicios (HDTV sobre IP por ejemplo), ni el ancho de banda es el único parámetro que es necesario
garantizar para proporcionar servicios de valor añadido.
En este artículo se presentan las diferentes experie
ncias llevadas a cabo con una pasarela residencial habilitada para proporcionar servicios garantizados de ‘triple play’ a los terminales de los usuarios. Esta pasarela se ha desarrollado en el proyecto europeo
de investigación y desarrollo del VI programa marco MUSE (Multiservice Access Everywhere, www.ist-muse.org).TRUEpu
BGP-like TE Capabilities for SHIM6
Full text linkIn this paper we present a comprehensive set of
mechanisms that restore to the site administrator the
capacity of enforcing Traffic Engineering (TE) policies in
a multiaddressed IPv6 scenario. The mechanisms rely on
the ability of SHIM6 to securely perform locator changes
in a transparent fashion to transport and application
layers. Once an outgoing path has been selected for a
communication by proper routing configuration in the
site, the source prefix of SHIM6 data packets is rewritten
by the site routers to avoid packet discarding due to
ingress filtering. The SHIM6 locator preferences
exchanged in the context establishment phase are
modified by the site routers to influence in the path used
for receiving traffic. Scalable deployment is ensured by
the stateless nature of these mechanismsTRUEpu