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Active network measurements play an important role not only in network monitoring for OAM purposes, but also in assessing the current network status and providing real-time information for the optimization of applications. This paper proposes the extension of SNMP-based monitoring mechanisms to also support active in-network measurements conforming to the standardized OWAMP protocol. A specialized...
Achieving accurate, cost-efficient, and fast anomaly localization is a highly desired feature in computer networks. Prior works, examining the problem of single link-level anomaly localization, have claimed that a necessary condition for localizing anomalies unambiguously is to deploy resources that enable the monitoring of a set of paths distinguishing between all links of the network pairwise. In...
HTTP Adaptive Streaming (HAS) is rapidly becoming a key video delivery technology for fixed and mobile networks. However, today there is no solution that allows network operators or CDN providers to perform network-based QoE monitoring for HAS sessions. We present a HAS QoE monitoring system, based on data collected in the network, without monitoring information from the client. To retrieve the major...
An increasing number of datacenter network applications, including automated trading and high-performance computing, have stringent end-to-end latency requirements where even microsecond variations may be intolerable. The resulting fine-grained measurement demands cannot be met effectively by existing technologies, such as SNMP, NetFlow, or active probing. We propose instrumenting routers with a hash-based...
We investigate the effects of employing a probabilistic fault detection approach relative the performance of a deterministic network monitoring method. The approach has its foundation in probabilistic network management, in which performance limits and thresholds are specified in terms of e.g. probabilities or belief values. When combined with adaptive mechanisms, probabilistic approaches can potentially...
We propose a circuit switching Network-on-chip with a parallel probe searching setup method, which can search the entire network in constant time, only dependent on the network size but independent of the network load. Under a specific search policy, the setup procedure is guaranteed to terminate in time 3D+6 cycles, where D is the geometric distance between source and destination. If a path can be...
It is very difficult to identify the location of bottlenecks when there is deterioration of Quality of Service (QoS) because current Internet service is the complicate structure which is provided through a number of ISP. This paper proposes bottleneck detection algorithm which can detect the bottleneck point easily and efficiently even though there is no prior knowledge of the network connection status...
IP-spoofing attacks remain one of the most damaging attacks in which an attacker replaces the original source IP address with a new one. Using the existing attacking tools to launch IP spoofing attacks, an attacker can now easily compromise access routers and not only the end-hosts. In this paper, we propose a trust-based approach using a Bayesian inference model that evaluates the trustworthiness...
Opto-electronic oscillators (OEOs) are based on a long optical fiber that acts as a high Q cavity. However, a long fiber is sensitive to the temperature fluctuation. The aim of this paper is to study the possibility of stabilizing the OEO cavity by employing the technology of radio frequency transfer over fiber links. We propose a scheme of a dual-loop OEO with a probe signal and experimentally demonstrate...
Today's Internet is a massive, distributed network which continues to grow in size as globalization takes major role in everyone's life. The problem is complicated by the fact that one cannot rely on the cooperation of individual servers and routers to aid in the collection of network traffic measurements vital for these tasks. Packet Forwarding Priority can have a significant impact on the performance...
Bandwidth is one of the most common terms in digital communication as it represents the supported amount of data that a link or network path can send per unit of time. Multimedia application's performance is directly impacted by available bandwidth because these applications have diverse Quality of Service (QoS) requirements. Internet is now a necessary technology in our daily life, and because of...
In cognitive radio networks, dynamic spectrum access is achieved by allowing secondary users (SUs) to probe the spectrum and utilize available channels opportunistically. Spectrum probing mechanisms should be efficient and fast to avoid harmful interference with primary users (PUs). Periodic probing has been commonly adopted as a default spectrum probing mechanism. In this paper, we attempt to study...
We present a statistical probing-approach to distributed fault-detection in networked systems, based on autonomous configuration of algorithm parameters. Statistical modelling is used for detection and localisation of network faults. A detected fault is isolated to a node or link by collaborative fault-localisation. From local measurements obtained through probing between nodes, probe response delay...
Network performance monitor has now become a central issue in network application and operation optimization. This article describes an integrated network performance monitor system using a combination of active and passive measurement techniques. Active probing technique is used for overall network performance monitor, and passive monitoring technique is used for local network performance information...
A Real-time and reliable detection of anomalies is an important and challenging task. Unlike most detection methods based on the statistical analysis of the packet headers (Such as IP addresses and ports), we propose a new nonlinear approach only using network traffic volumes to detect anomalies reliably. Our method is based on the largest Lyapunov exponent and the change-point detection theory to...
Monitoring at the flow level is crucial to ensure the correct operation of networks. Any sizable network relies on a number of monitoring probes, both to provide different observation points but also to scale to the ever-increasing number of flows that go through it. This situation gives rise to the difficult problem of assigning monitoring of flows to the available probes so that the network-wide...
This paper studies the problem of the real-time communication in the on-line monitoring system, which achieves the on-line monitoring of B / S mode through the ActiveX controls and network programming technology based on the TCP / IP protocol. This paper proposes an improved congestion control algorithm grounded on the one-way delay (CCAOD), using the value and the change trendency of the one-way...
Various tools, which are capable to evade different security mechanisms like firewall, IDS and IPS, exist and that helps the intruders for sending malicious traffic to the network or system. So, inspection of malicious traffic and identification of anomalous activity is very much essential to stop future activity of intruders which can be a possible attack. In this paper we present a flow based system...
In this paper, we propose a network performance monitoring method which can measure delay of each network using the RTCP(Real-time Transport Control Protocol) timestamp fields to detect a trouble section in interworking environment. According to the increment of real-time multimedia service provision, network performance monitoring method is necessarily needed for QoS management of real-time services...
We have proposed CoMPACT monitor that achieves scalable measurement of one-way delay distribution for each flow. CoMPACT monitor is technique that transforms one-way delay data obtained by active measurement by using passively monitored traffic data of the target flow. In a recent study, it was reported that by using an inter-probe time that has a Gamma distribution can improve the accuracy of simple...
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