Abstract-Technological developments of the last few years have favoured the creation of distributed networking infrastructures (usually referred to as Community Networks) where the resources are made available to the members of a community of people. With emerging large-scale community infrastructures the opportunities for new commercial services and for innovative business models are becoming feasible. Since one of the most resource-demanding services today is access to user-generated content through the web, suitable content delivery services are needed in the context of Community Networks in orders to make an effective usage of shared resources.In this paper we describe two architectures we have designed to provide optimized delivery of multimedia web content (e.g. video but also other kinds of User Generated Content) within Community Networks. Both architectures work without any kind of cooperation from the original content providers but assume that a basic web caching service is provided within the network, either by commercial Service Providers or by the community members themselves.While the first architecture relies on a traditional centralized control entity, the second is designed according to the peer-topeer paradigm, in order to provide better scalability, robustness to failures and self-configurability. Experimental results are also presented aimed at evaluating the performance gains for endusers from a localized distribution of content in scenarios in which community members are distributed in clusters sparse at different geographic locations.
Several multi-path routing algorithms have been recently proposed to achieve load balancing and increase security. However, the functionalities required to split traffic flows over multiple paths have not been standardized yet. Multi-protocol label switching (MPLS) offers a suitable environment to implement multi-path routing algorithms, as multiple parallel label switched paths (LSPs) may be established to carry each a portion of a traffic flow. This paper focuses on a traffic splitting mechanism designed for MPLS networks. We propose a set of new operations to be performed by the edge routers and illustrate them with reference to a popular open source implementation of the MPLS stack. We implemented the new operations and give a demonstration of their functionality using an experimental testbed
Abstract-Cloud-enabled datacenters need advanced support for an integrated management of platform virtualization technologies. The networking infrastructure of large-scale datacenters is implemented according to redundant multi-tiered architectures whose layers operate at Layer 3 of the networking stack. Splitting the network infrastructure of a datacenter in a number of IP subnets, however, creates limits to the migration of Virtual Machines, reducing the possibility for administrators to efficiently balance the load and reduce the energy consumption of the whole infrastructure. In this paper we propose an innovative solution that allows transparent migration of Virtual Machines across the whole datacenter, based on the coordinated use of NAT rules that need to be consistently managed across the layers of the datacenter networking infrastructure. We describe in details how our approach can be easily implemented with current network devices without any modification to their hardware and present an experimental evaluation of an early prototype of our solution.
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