This paper outlines initial analysis from research in progress into ADSL homed Nepenthes honeypots. One of the Nepenthes honeypots prime objective in this research was the collection of malware for analysis and dissection. A further objective is the analysis of risks that are circulating within ISP networks in Western Australian. What differentiates Nepenthes from many traditional honeypot desi...

In this paper we investigate a new technique in FEXT cancellation along with the comparison with other techniques in this area of research. In our algorithm, FIR filters are derived from channel and crosstalk transfer functions, which are the key part of FEXT canceling process. Its comparison with Vectored-DMT and Adaptive Multi-User Power Control shows its effectiveness in removing FEXT withou...

This paper presents an efficient method for updating echo canceller (EC) coefficients in ADSL transceivers during transmission that removes the dependency of updates on the far end signal. The new method improves on the frequency domain EC architecture by Ho, Cioffi, and Bingham in that it converges faster, improves the stability to perturbation, and is not prone to bias from pilot tones. The n...

A growing number of network computers are connected to the Internet through asymmetric connections such as ADSL, CableNet, Satellite link and other broadband solutions. However, the asymmetric nature of such connections may have significant impact on the performance of TCP transmission as upstream bandwidth can be easily overloaded. In this situation TCP’s selfclocking mechanism may be misled w...

TCP is the most widely used protocol for data transfer over the Internet and for most applications the performance metric of interest is throughput. Identifying the reasons for the throughput limitation of an observed connection is a complex task. We present a set of techniques, called the TCP root cause analysis toolkit, that allow users to determine from a passively captured packet trace the ...

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique which is already widely employed in both wireless communication systems (WLAN, DVB-T, WiMAX) as well as wireline systems (ADSL, VDSL, PLC). Due to highly increasing speeds and lower costs of electronics, OFDM has recently also gained much interest in optical communication systems. In this paper, we will dis...

We present and evaluate a procedure that utilizes mobility and throughput prediction to prefetch video streaming traffic in integrated cellular and WiFi networks. Our evaluation is based on trace-driven simulation considering empirical measurements and shows how various parameters influence the performance, in terms of the number of paused video frames and the energy efficiency; these parameter...

HSDPA technology has been recently introduced by UMTS mobile operators as a solution both for increasing the downlink throughput and for achieving a more efficient usage of the radio resources. This work analyses the performance of TCP traffic over HSDPA from the user perspective based on experiments and measurements over a real network. The effect of multiple HSDPA users sharing the overall ca...

Wireless communication is one of the speedily evolving and dynamic technology areas in realm communication. OFDM an acronym for Orthogonal Frequency Division Multiplexing. It a version FDM which orthogonal subcarriers are closely spaced to maximize bandwidth consumption. By decreasing Inter Symbol Interference (ISI) increasing Signal-to-Noise ratio (SNR), it has enhanced quality long-distance I...