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For data center networks (DCNs), it is very important to perform multicast transmission reliably. However, due to packet loss in DCNs, not only the reliability of data transmission should be guaranteed, but also the network throughput should be maintained stably. To this end, in this paper, we design a multicast fat-tree data restoration strategy (MRDC). The advantage of MRDC is that it can haul back...
Federated cloud facilitates data sharing across multiple organizations. Existing distributed storage systems cannot support efficient data search with complicated query requirements. This paper proposes a DS-index solution to provide distributed search in federated cloud, targeting to support multi-attribute range search with secondary index. DS-index includes a three-layer architecture with a multi-attribute...
In this work, routing strategies of an arriving request to a server in a prioritized limited multi-server processor-sharing (PS) system are studied in order to optimize a given performance criterion. In this system, an arriving request enters the dispatcher, which routes this request to each server according to a predetermined strategy. In the prioritized limited PS server, a high-priority request...
With the development of network, IP geolocation technology has been widely used. Nearly all of the previous IP geolocation technology depends on the delay information. And most of them are based on the assumption of strong correlation between network delay and the geographic distance. But in China the correlation is weak. That makes the IP geolocation precision very low. To improve the problem, we...
An overlay network's efficiency can be improvedby taking advantage of its network structure. However, beforea structured network can be constructed, nodes has to be topologicallysorted. One of the common form of topological sortingis linearization where nodes are arranged in a linear order withrespect to its identifiers. Linearization is not a difficult task,however, to keep nodes in a correct state...
Over the last decade, the evolution of data center architecture designs has been mainly driven by the ever increasing bandwidth demands, high power consumption and cost. With all these in mind, a significant potential to improve bandwidth capacity and reduce power consumption and cost can be achieved by introducing PONs in the design of the networking fabric infrastructure in data centers. This work...
A computer has become possible to operate more services by improving the performance. Therefore, there is a growing tendency to aggregate a single computer. In consequence, a virtualization technology such as VM (Virtual Machine) is receiving a lot of attention.
In this work, we focus on designing high-throughput anycast mechanisms in a software Defined Network (SDN), as anycast routing serves as a fundamental building block for many services. Specifically, we investigate two main challenges for efficient implementation of a SDN-based anycast system: high throughput anycast routing (HTAR) and congestion-free anycast reconfiguration (CFAR). For the first challenge,...
Computer networks today typically do not provide any mechanisms to the users to learn, in a reliable manner, which paths have (and have not!) been taken by their packets. Rather, it seems inevitable that as soon as a packet leaves the network card, the user is forced to trust the network provider to forward the packets as expected or agreed upon. This can be undesirable, especially in the light of...
The traditional identifier locator split network has many issues such as inflexibility, hard to innovate and difficult to deploy. SDN (Software Defined Network) provides a new direction for designing flexible identifier locator split network. The recent identifier locator split network based on SDN use the OpenFlow swicth directly via rewritting the address, which lacks the scalability and utilizes...
Server-centric data center networks enable several important features of modern data center applications, such as cloud storage and big data processing. However, network failures are ubiquitous and significantly affect network performance, such as routing correctness and network bandwidth. Existing server-centric data centers do not provide specific fault-tolerance mechanisms to recover the network...
This paper aims to design a Hadoop system and evaluates the performance of a task allocation scheme. The task allocation scheme splits each job into tasks using an appropriate splitting ratio, and assigns tasks to slave servers based on server processing performance and network resource availability. We experimentally evaluate the performance of the scale out of the task allocation scheme with five...
The flexible architectures address the determined server population in the rigid designs of data centers networks. However, the asymmetrical connection of flexible architectures will introduce load imbalance. To address this issue, we take flexibility and symmetry into consideration and propose ComCell. ComCell is recursively constructed on the division of ports in a switch, where all switches play...
For stabilizing power frequency in the grid, demand-supply balancing capability by manipulating the demand side, known as Demand Response (DR), is getting attention because of the continuous increase in renewable energy resources and deferrable loads such as electric vehicles in addition to the traditional adjustment function by supply side such as thermal plants. In the future smart grid, it is imperative...
This paper shows the effectiveness of the system that controls the network route based on social information. An automatic route control is performed with the network virtualization node FLARE that uses VLAN coupling between each base of the wide area network test bed called JGN-X as a platform.
SDI (Software Defined Infrastructure) provides virtualized infrastructures to customers by slicing computing resources and network resources. One of the important problems for deploying SDI framework is to control the assignment of physical resources to a virtual network against changes of traffic demand and service demand. For this problem, VNE (Virtual Network Embedding) problem that maps a virtual...
Link flooding attack (LFA), as a new type of DDoS attack, can degrade or even cut off network connectivity of a target area. This attack employs legitimate, low-density flows to flood a group of selected links. Therefore, these malicious flows can hardly be distinguished by traditional schemes. In this paper, we propose a scheme called Woodpecker, which makes the LFA more difficult to take effect...
Named-Data Networking (NDN) is a promising architecture for the future Internet. However, it is hampered by interest flooding, an NDN-tailored DDoS attack which has been shown to cause dropping majority of legitimate packets. While several defence mechanisms have been suggested against it, they cannot protect NDN against the Collusive Interest Flooding Attack (CIFA), a previously disregarded version...
It is important to build overlays for topic-based publish/subscribe (pub/sub) under resource constraints. In a topic-connected overlay (TCO), each topic t induces a connected sub-overlay among all nodes interested in t. Existing work merely consider how to optimize a complete TCO and implicitly commit the unrealistic assumption of unlimited resources. In contrast, we make maximum use of restricted...
The rapid development of cloud computing has raised big concerns over the high energy consumption of modern data centers. To satisfy the ever increasing data traffic needs, the energy consumption of data center network (DCN) also takes a significant proportion. The newly emerging technology, Software Defined Networking (SDN), which allows flexible control of network devices, brings a new opportunity...
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