The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
I.-en Liao - One of the best experts on this subject based on the ideXlab platform.
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Detecting rogue access points using client-side bottleneck bandwidth analysis
Computers & Security, 2009Co-Authors: Kuo-fong Kao, I.-en LiaoAbstract:A rogue access point (AP) is an unauthorized AP plugged into a network. This poses a serious security threat. To detect an AP, a network manager traditionally takes the electric wave sensor across an entire protected place. This task is very labor-intensive and inefficient. This study presents a new AP detection method without extra hardware or hard work. This new method determines whether the network packets of an IP address are routed from APs, according to client-side bottleneck bandwidth. The network manager can perform his job from his office by monitoring the packets passing through the Core Switch. The accuracies remain above 99% when the parameter, sliding window size, of the proposed algorithm is larger than 20, according to experimental results. The proposed method effectively reduces the network manager's workload, and increases network security.
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Detecting rogue access points using client-side bottleneck bandwidth analysis
Computers & Security, 2009Co-Authors: Kuo-fong Kao, I.-en LiaoAbstract:A rogue access point (AP) is an unauthorized AP plugged into a network. This poses a serious security threat. To detect an AP, a network manager traditionally takes the electric wave sensor across an entire protected place. This task is very labor-intensive and inefficient. This study presents a new AP detection method without extra hardware or hard work. This new method determines whether the network packets of an IP address are routed from APs, according to client-side bottleneck bandwidth. The network manager can perform his job from his office by monitoring the packets passing through the Core Switch. The accuracies remain above 99% when the parameter, sliding window size, of the proposed algorithm is larger than 20, according to experimental results. The proposed method effectively reduces the network manager's workload, and increases network security. (C) 2008 Elsevier Ltd. All rights reserved
Kuo-fong Kao - One of the best experts on this subject based on the ideXlab platform.
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Detecting rogue access points using client-side bottleneck bandwidth analysis
Computers & Security, 2009Co-Authors: Kuo-fong Kao, I.-en LiaoAbstract:A rogue access point (AP) is an unauthorized AP plugged into a network. This poses a serious security threat. To detect an AP, a network manager traditionally takes the electric wave sensor across an entire protected place. This task is very labor-intensive and inefficient. This study presents a new AP detection method without extra hardware or hard work. This new method determines whether the network packets of an IP address are routed from APs, according to client-side bottleneck bandwidth. The network manager can perform his job from his office by monitoring the packets passing through the Core Switch. The accuracies remain above 99% when the parameter, sliding window size, of the proposed algorithm is larger than 20, according to experimental results. The proposed method effectively reduces the network manager's workload, and increases network security.
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Detecting rogue access points using client-side bottleneck bandwidth analysis
Computers & Security, 2009Co-Authors: Kuo-fong Kao, I.-en LiaoAbstract:A rogue access point (AP) is an unauthorized AP plugged into a network. This poses a serious security threat. To detect an AP, a network manager traditionally takes the electric wave sensor across an entire protected place. This task is very labor-intensive and inefficient. This study presents a new AP detection method without extra hardware or hard work. This new method determines whether the network packets of an IP address are routed from APs, according to client-side bottleneck bandwidth. The network manager can perform his job from his office by monitoring the packets passing through the Core Switch. The accuracies remain above 99% when the parameter, sliding window size, of the proposed algorithm is larger than 20, according to experimental results. The proposed method effectively reduces the network manager's workload, and increases network security. (C) 2008 Elsevier Ltd. All rights reserved
Jennifer Rexford - One of the best experts on this subject based on the ideXlab platform.
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proactive routing in scalable data centers with paris
ACM Special Interest Group on Data Communication, 2014Co-Authors: Dushyant Arora, Theophilus Benson, Jennifer RexfordAbstract:Modern data centers must scale to a large number of servers, while offering flexible placement and migration of virtual machines. The traditional approach of connecting layer-two pods through a layer-three Core constrains VM placement. More recent 'flat' designs are more flexible but have scalability limitations due to flooding/broadcasting or querying directories of VM locations. Rather than reactively learn VM locations, our PARIS architecture has a controller that pre-positions IP forwarding entries in the Switches. Switches within a pod have complete information about the VMs beneath them, while each Core Switch maintains complete forwarding state for part of the address space. PARIS offers network designers the flexibility to choose a topology that meets their latency and bandwidth requirements. We evaluate our PARIS prototype built using OpenFlow-compliant Switches and NOX controller. Using PARIS we can build a data center network that supports up to 100K servers.
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DCC@SIGCOMM - ProActive routing in scalable data centers with PARIS
Proceedings of the 2014 ACM SIGCOMM workshop on Distributed cloud computing - DCC '14, 2014Co-Authors: Dushyant Arora, Theophilus Benson, Jennifer RexfordAbstract:Modern data centers must scale to a large number of servers, while offering flexible placement and migration of virtual machines. The traditional approach of connecting layer-two pods through a layer-three Core constrains VM placement. More recent 'flat' designs are more flexible but have scalability limitations due to flooding/broadcasting or querying directories of VM locations. Rather than reactively learn VM locations, our PARIS architecture has a controller that pre-positions IP forwarding entries in the Switches. Switches within a pod have complete information about the VMs beneath them, while each Core Switch maintains complete forwarding state for part of the address space. PARIS offers network designers the flexibility to choose a topology that meets their latency and bandwidth requirements. We evaluate our PARIS prototype built using OpenFlow-compliant Switches and NOX controller. Using PARIS we can build a data center network that supports up to 100K servers.
Ichiroh Suzuta - One of the best experts on this subject based on the ideXlab platform.
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AXARPS: Scalable ARP Snooping Using Policy-Based Mirroring of Core Switches
Advanced Information Networking and Applications, 2020Co-Authors: Motoyuki Ohmori, Naoki Miyata, Ichiroh SuzutaAbstract:In order to handle a computer security incident or network failure, it is important to grasp a list of pairs of IP and MAC addresses of hosts. Ones may then traditionally poll an Address Resolution Protocol (ARP) table of a Core Switch at an interval using SNMP or other methods. This traditional method based upon polling, however, has two major drawbacks that (1) some pairs of IP and MAC addresses may not be obtained and (2) incurs a heavy load on a Core Switch. This paper then proposes AXARPS that is the novel scalable ARP snooping to build a list of pairs of IP and MAC addresses. AXARPS can avoid missing pairs of IP and MAC addresses by monitoring all ARP traffic instead of the traditional method. AXARPS also can reduce a CPU load on a recent high-end Core Switch by approximately 20% in comparison with the traditional method. AXARPS is scalable because AXARPS incurs no additional CPU load even the number of hosts increases. AXARPS employs a policy-based mirroring of a Switch that mirror traffic that matches a specified filter. The policy-based mirroring can then mirror ARP traffic only, and reduce a load on an ARP parsing server.
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AINA - AXARPS: Scalable ARP Snooping Using Policy-Based Mirroring of Core Switches
Advanced Information Networking and Applications, 2019Co-Authors: Motoyuki Ohmori, Naoki Miyata, Ichiroh SuzutaAbstract:In order to handle a computer security incident or network failure, it is important to grasp a list of pairs of IP and MAC addresses of hosts. Ones may then traditionally poll an Address Resolution Protocol (ARP) table of a Core Switch at an interval using SNMP or other methods. This traditional method based upon polling, however, has two major drawbacks that (1) some pairs of IP and MAC addresses may not be obtained and (2) incurs a heavy load on a Core Switch. This paper then proposes AXARPS that is the novel scalable ARP snooping to build a list of pairs of IP and MAC addresses. AXARPS can avoid missing pairs of IP and MAC addresses by monitoring all ARP traffic instead of the traditional method. AXARPS also can reduce a CPU load on a recent high-end Core Switch by approximately 20% in comparison with the traditional method. AXARPS is scalable because AXARPS incurs no additional CPU load even the number of hosts increases. AXARPS employs a policy-based mirroring of a Switch that mirror traffic that matches a specified filter. The policy-based mirroring can then mirror ARP traffic only, and reduce a load on an ARP parsing server.
Riccardo Hertel - One of the best experts on this subject based on the ideXlab platform.
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Influence of the dynamic dipolar interaction on the current-induced Core Switch in vortex pairs
Physical Review B, 2009Co-Authors: Yaowen Liu, Zhiwei Hou, Sebastian Gliga, Riccardo HertelAbstract:The effective manipulation of the orientation of a vortex Core by spin-polarized currents introduces the technologically relevant possibility of addressing individual nanomagnets within large arrays. The vortex configuration, which minimizes the interactions between elements, in principle, allows for high integration densities. Using micromagnetic simulations, we find however that the polarity and vorticity of neighboring vortices can strongly modify the parameters necessary to trigger the Core Switch, increasing, for example, the Switching currents as compared to an insolated disk. Such variations are attributed to the formation of charges during the vortex dynamics and can be interpreted using an analytical model based on the generalized Thiele equation. This model takes into account the dynamic dipolar interaction between neighboring vortices
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Switching a magnetic antivortex Core with ultrashort field pulses
Journal of Applied Physics, 2008Co-Authors: S. Gliga, Riccardo Hertel, Christian SchneiderAbstract:Antivortices are fundamental magnetic structures found alongside vortices in soft magnetic extended films and in patterned elements above a few micrometers in size. While the dynamic behavior of vortices has been the object of numerous studies, the magnetization dynamics of antivortices has not been studied as thoroughly. Using micromagnetic simulations, we investigate the dynamics of a single isolated antivortex in response to subnanosecond external field pulses. We find that these pulses can trigger the reversal of the antivortex Core. This reversal mechanism is complementary to the one recently found in the vortex Core Switch. We also investigate the stability of the Switching process in the isolated antivortex structure.