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Achieving Flow-Level Controllability in Network Intrusion Detection System

Achieving Flow-Level Controllability in Network Intrusion De...

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ACIS international conference on Software Engineering, Artificial Intelligence, networking, and Parallel/distributed computing (SNPD)

作者： Bo Song Weibing Yang Mingyu Chen Xiaofang Zhao Jianping Fan Chinese Academy of Sciences Beijing Beijing CN Institute of Computing Technology Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424474226;9780769540887

Current network intrusion detection systems are lack of controllability, manifested as significant packet loss due to the long-term resources occupation by a single flow. the reasons can be classified into two kinds. the first kind is known as normal reasons, that is, the processing of mass arriving packets of a large flow can not be limited to a determinable period of time and thus makes other flows starved. the second kind, in which the CPU is trapped in a dead-loop like state due to processing some packets with particular content of a flow, is considered as abnormal reasons. In fact, it is a kind of software crashes. In this paper, we discuss the innate defects of traditional packet-driven NIDS, and implement a flow-driven framework which can achieve fine-grained controllability. An Active Two-threshold scheme based on ideal Exit-Point (ATEP) is proposed in order to diminish data preserving overhead during flow switches and to detect crash in time. A quick crash recovery mechanism is also given which can recover the trapped thread from 90% crashes in 0.2 ms. the experimental results show that our flow-driven framework with ATEP scheme can achieve higher throughput and less packet loss ratio than the uncontrollable packet-driven systems with less than 1% of extra CPU overhead. What's more, in the case of crash occurrence, the ATEP scheme is still able to maintain rather steady throughput without sudden decrease.

关键词： Controllability Intrusion detection Computer crashes Vehicle crash testing System testing Software testing throughput Software engineering Artificial intelligence

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Experiences with Hierarchical Storage Management support in Blue Whale File System

Experiences with Hierarchical Storage Management support in ...

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11th international conference on Parallel and distributed computing, Applications and Technologies, PDCAT 2010

作者： Ma, Hongyuan Liu, Zhenjun Zhang, Huan Feng, Shuo Han, Xiaoming Xu, Lu Institute of Computing Technology Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769542874

In order to meet the challenges of significant storage and application growth, as well as shortened backup windows and limited IT resources, more and more organizations embrace Hierarchical Storage Management (HSM). Parts of SAN file systems provide the ability to support HSM, but they didn't provide more details in design considerations and how to implement. In this paper, we present design considerations in Blue Whale File System (BWFS) which is a high performance SAN file system and implement the system. Event, migration and attribute constitute the three aspects of data management mechanism in BWFS. As for READ/WRITE/TRUNCATE event, the problem is that a client directly accesses to storage devices containing file data, rather than through a metadata server. We monitor LayoutGet operation instead of real I/O path. BWFS is a multi-volume file system which can support single name space across multiple data volumes. When different storage devices are managed by BWFS, migration is between volumes in BWFS. We also implement migration between BWFS and external repository. We believe the solutions to the problem we encountered are useful to file system developers. © 2010 IEEE.

关键词： Information management

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A Faster P Solution for the Byzantine Agreement Problem

A Faster P Solution for the Byzantine Agreement Problem

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11th international conference on Membrane computing

作者： Dinneen, Michael J. Kim, Yun-Bum Nicolescu, Radu Univ Auckland Dept Comp Sci Auckland 1 New Zealand

ISBN: (纸本)9783642181221

We propose an improved generic version of P modules, an extensible framework for recursive composition of P systems. We further provide a revised P solution for the Byzantine agreement problem, based on Exponential Information Gathering (EIG) trees, for N processes connected in a complete graph. Each process is modelled by the combination of N + 1 modules: one "main" module, plus one "firewall" communication module for each process (including one for itself). the EIG tree evaluation functionality is localized into a "main" single cell P module. the messaging functionality is localized into a three cells communication P module. this revised P solution improves overall running time from 9L+6 to 6L + 1., where L is the number of messaging rounds. Most of the running time, 5L steps, is spent on the communication overhead. We briefly discuss if single cells can solve the Byzantine agreement without support and protection from additional communication cells;we conjecture that this is not possible, within the currently accepted definitions.

关键词： P systems P modules Byzantine agreement distributed algorithms Modular design

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A proposal for WS-agreement negotiation

A proposal for WS-agreement negotiation

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2010 11th IEEE/ACM international conference on Grid computing, Grid 2010

作者： Battré, Dominic Brazierz, Frances M.T. Clarkz, Kassidy P. Oeyz, Michael Papaspyroux, Alexander Wäldrichy, Oliver Wieder, Philipp Zieglery, Wolfgang Technische Universität Berlin Complex and Distributed IT Systems 10587 Berlin Germany Fraunhofer SCAI Schloss Birlinghoven 53754 Sankt-Augustin Germany Systems Engineering Faculty of Technology Policy and Management Delft University of Technology Netherlands Robotics Research Institute TU Dortmund University Dortmund Germany IT Management and Service Computing Group TU Dortmund University Dortmund Germany

ISBN: (纸本)9781424493487

the Web Services Agreement specification defines a normative language to formulate Service Level Agreements and a basic protocol to expose service-level descriptions, validate service-level requests, and come to an agreement. this protocol, often called "take-it-or-leave-it", allows a service provider and a service consumer to decide whether to accept or reject a service offer. Although this approach is sufficient for a number of use cases, others exist with requirements for multi-step negotiation or the adaptation of an existing agreement. In this paper, we describe the Web Services Agreement Negotiation protocol, a proposal by the Open Grid Forum to extend the existing specification. this proposal is the result of combining various research activities that have been conducted to define protocols for negotiating service levels or to supersede the existing "take-it-or-leave-it" protocol. the main characteristics of this proposal are the multi-round negotiation capability, renegotiation capability, and compliance with the original specification. © 2010 IEEE.

关键词： Web services

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A novel model and a simulation tool for churn of P2P network

A novel model and a simulation tool for churn of P2P network

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11th international conference on Parallel and distributed computing, Applications and Technologies, PDCAT 2010

作者： Luo, Qiuming Li, Yun Dong, Wentao Liu, Gang Mao, Rui National High Performance Computing Center Shenzhen University China College of Computer Science and Software Engineering Shenzhen University China College of Information Engineering Shenzhen University China

ISBN: (纸本)9780769542874

the prior studies setup the churn model by measuring the historical logs or records of a P2P network, and treat it as one whole black-box without understanding the inside of peer's population. the metrics used to characterize the churn is distributions of the node session lengths and arrival intervals. We investigate churn in another point of view, and find that modeling it based on the global geographical distribution of peer nodes will result in a system which behave in the way compliant to the measurement taken by previous works. this model considers the user behavior pattern into account. then we provide a Matlab tools that can provide churn events according to this model. From the output events of simulation, we do see some more future things than other models. We might expect or predict when and what nodes would return back, as well as when and what nodes would disappear at high possibility. So it is useful when designing a system optimized both to the pass and the future, which could reduce the overhead of the maintenance of underlying overlay network of DHTs and lower the redundant level of replications for P2P storage system. © 2010 IEEE.

关键词： Geographical distribution

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Analysis and modeling of time-correlated failures in large-scale distributed systems

Analysis and modeling of time-correlated failures in large-s...

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2010 11th IEEE/ACM international conference on Grid computing, Grid 2010

作者： Yigitbasi, Nezih Gallet, Matthieu Kondo, Derrick Iosup, Alexandru Epema, Dick Delft University of Technology Netherlands Ecole Normale Superieure de Lyon France INRIA Grenoble France

ISBN: (纸本)9781424493487

the analysis and modeling of the failures bound to occur in today's large-scale production systems is invaluable in providing the understanding needed to make these systems fault-tolerant yet efficient. Many previous studies have modeled failures without taking into account the time-varying behavior of failures, under the assumption that failures are identically, but independently distributed. However, the presence of time correlations between failures (such as peak periods with increased failure rate) refutes this assumption and can have a significant impact on the effectiveness of fault-tolerance mechanisms. For example, the performance of a proactive fault-tolerance mechanism is more effective if the failures are periodic or predictable;similarly, the performance of checkpointing, redundancy, and scheduling solutions depends on the frequency of failures. In this study we analyze and model the time-varying behavior of failures in large-scale distributed systems. Our study is based on nineteen failure traces obtained from (mostly) production large-scale distributed systems, including grids, P2P systems, DNS servers, web servers, and desktop grids. We first investigate the time correlation of failures, and find that many of the studied traces exhibit strong daily patterns and high autocorrelation. then, we derive a model that focuses on the peak failure periods occurring in real large-scale distributed systems. Our model characterizes the duration of peaks, the peak inter-arrival time, the inter-arrival time of failures during the peaks, and the duration of failures during peaks;we determine for each the best-fitting probability distribution from a set of several candidate distributions, and present the parameters of the (best) fit. Last, we validate our model against the nineteen real failure traces, and find that the failures it characterizes are responsible on average for over 50% and up to 95% of the downtime of these systems. © 2010 IEEE.

关键词： Fault tolerance

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Reliability analysis of declustered-parity RAID 6 with disk scrubbing and considering Irrecoverable Read Errors

Reliability analysis of declustered-parity RAID 6 with disk ...

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5th IEEE international conference on networking, Architecture and Storage, NAS 2010

作者： Gao, Yan Meister, Dirk Brinkmann, André University of Paderborn Paderborn Center for Parallel Computing Fuerstenallee 11 33102 Paderborn Germany

ISBN: (纸本)9780769541341

We investigate the impact of Irrecoverable Read Errors (IREs) on Mean Time To Data Loss (MTTDL) of declustered-parity RAID 6 systems. By extending the analytic model to study the reliability of RAID 5 systems from [1] we obtain the MTTDL which mainly takes into account two types of data loss: data loss caused by three independent disk failures, and data loss due to a detected IRE during the rebuild after two disks failed. Furthermore we improve the analysis by also considering disk scrubbing to reduce the probability of IREs via periodically reading the data stored on a disk. the results of our numerical analysis show that IREs have a large effect on the MTTDL. the countermeasure is to increase the disk scrubbing rate. As an example, the MTTDL of a system where each disk is scrubbed everyday increases by a factor of at least 27 compared to that of a system with a scrubbing rate of once a year. In addition, declustered-parity RAID 6 system improves the reliability of standard non-declustered RAID 6 systems. For example, a declustered-parity RAID 6 system without disk scrubbing improves the MTTDLs by a factor at least 150 compared to that of a standard system where each disk is scrubbed everyday. © 2010 IEEE.

关键词： Errors

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An adaptive timeout strategy for UDP flows using SVMs

An adaptive timeout strategy for UDP flows using SVMs

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11th international conference on Parallel and distributed computing, Applications and Technologies, PDCAT 2010

作者： Cai, Jing Zhang, Zhibin Zhang, Peng Song, Xinbo Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China National Engineering Laboratory for Information Security Beijing China

ISBN: (纸本)9780769542874

With the increase of network bandwidth, more and more new applications such as audio, video and online games have become the main body in network traffic. Based on realtime considerations, these new applications mostly use UDP as transport layer protocol, which directly increase UDP traffic. However, traditional studies believe that TCP dominates the Internet traffic and previous traffic measurements were generally based on it while UDP was ignored. In view of this, we mainly discuss the adaptive timeout strategy of UDP flows in this paper. Firstly, due to the significant differences in flow characteristics between the TCP flows and UDP flows, we expound and prove that the existing adaptive timeout strategies are not appropriate for UDP flows. Secondly, we present our adaptive strategy using Support Vector Machine techniques. We build six classifiers to accurately predict its corresponding maximum packet inter-arrival time and adapt its timeout value within the flow duration. Limited to its accurate rating, we present another concept of adjust accuracy rating which can probability-guaranteed(90%,95%,98%) to avoid long flow to be cut into short flows. the experiment result reveals that our adaptive strategy has the potential to achieve significant performance advantages over other widely used fixed and other adaptive timeout schemes. © 2010 IEEE.

关键词： Support vector machines

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Methodology of measurement for energy consumption of applications

Methodology of measurement for energy consumption of applica...

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international Workshop on Grid computing

作者： Georges Da Costa Helmut Hlavacs IRIT Université Paul Sabatier Toulouse France Department of Distributed and Multimedia Systems University of Technology Vienna Vienna Austria

For IT systems, energy awareness can be improved in two ways, (i) in a static or (ii) in a dynamic way. the first way leads to building energy efficient hardware that runs fast and consumes only a few watts. the second way consists of reacting to instantaneous power consumption, and of taking decisions that will reduce this consumption.

关键词： Power demand Power measurement Kernel Hardware Load modeling Computers Current measurement

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On evaluation of the F0 estimation based on time-varying complex speech analysis

On evaluation of the F0 estimation based on time-varying com...

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作者： Funaki, Keiichi Computing and Networking Center University of the Ryukyus Japan

We have already proposed a robust fundamental frequency (F0) estimation based on robust ELS (Extended Least Square) time-varying complex-valued speech analysis for an analytic speech signal. It has been reported that the method performs better for IRS filtered speech corrupted by white Gauss noise or pink noise since speech spectrum can be accurately estimated in low frequencies. However, the evaluation was performed by using only time-invariant speech analysis, in which order of basis expansion was 1. In this paper, the performance of time-varying speech analysis is evaluated using Keele pitch database with respect to degree of voiced stationarity of frame. the evaluation demonstrates that the time-varying ELS-based robust complex analysis performs best for strong stationary voiced frame although it does not perform better for non-stationary voiced frame. © 2010 ISCA.

关键词： Frequency estimation

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