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Software Defined Networking (SDN) is gaining momentum with the support of major manufacturers. While it brings flexibility to the management of flows within the data center fabric, this flexibility comes at the cost of smaller routing table capacities. Indeed, the Ternary Content-Addressable Memory (TCAM) needed by SDN devices has smaller capacities than CAMs used in legacy hardware.In this paper,...
Middleboxes, which implement specific network service functions – e.g. firewalls, load balancers, NATs – have traditionally been deployed as hardware appliances, thereby imposing significant constraints on network operators, who must ensure that the traffic is effectively routed to the appropriate set of middleboxes, following the right order. Being hardware-based, these boxes offer limited upgrade...
Peer to peer is a network approach where users (peers) act as client and server, depending on the request that it received. This double behavior client/server is a key pass to the offered service scale. The P2P allows sharing data and resources as well. An important parameter that will impact the protocol efficiency is the vision that a peer owns about the global network when acting in the swarm,...
Energy-efficient/green routing protocols aim at optimizing the energy consumption of networks. Such solutions usually require to take coordinated actions between routers to setup a green network topology. Green routing protocols have been studied theoretically and using simulations; however, they have not been implemented or tested yet in real routing protocols. Therefore, it is difficult to assess...
TCP Cubic is designed to better utilize high bandwidth-delay product paths in IP networks. It is currently the default TCP version in the Linux kernel. Our objective in this work is to better understand the performance of TCP Cubic in scenarios with a large number of competing long-lived TCP flows, as can be observed, e.g., in cloud environments. In such situations, Cubic connections tend to synchronize...
Virtualization is heavily used in modern private and public data centers. By enabling the consolidation of many virtual machines (VMs) in a physical server, virtualization blurs the frontier between networking and system. We have investigated in a previous work the various prices due to virtualization when a packet is moved from one VM to the physical NIC, by focusing on a pure UDP scenario and multiple...
Cloud networking typically leads to scenarii where a large number of TCP connections share a common bottleneck link. In this paper, we focus on the case of TCP Cubic, which is the default TCP version in the Linux kernel. TCP Cubic is designed to better utilize high bandwidth-delay product path in an IP network. To do so, Cubic modifies the linear window growth function of legacy TCP standards, e.g...
Virtualization is the cornerstone of modern private and public cloud solutions. By enabling the consolidation of many virtual machines (VMs) within a physical server, virtualization blurs the frontier between networking and system. The interconnection network now starts within the physical servers, where several (virtual) servers compete to access the network interface cards (NICs). However, our understanding...
Nowadays, power consumption in computer systems is an active and important subject of discussion in both research and political communities. Indeed, increasing the performance of such computer systems frequently requires increasing the number of resources, thus leading to higher power consumption and a negative impact on the environment. Some strategies to reduce the energy consumption are based on...
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