API Application Programming Interface BAR Backbone Access Router

At last year’s inaugural AllHands meeting, our paper outlined the proposed development of a comprehensive and extensible network monitoring infrastructure for UK e-Science. This paper initially serves as an update, outlining the last year’s good progress in establishing an infrastructure which is already supplying tangible benefits. The paper then introduces the project’s second phase, which will see GridMon’s integration into Grid technology via compliance with the Open Grid Services Architecture. The starting point for this journey has been the development of GridMon as a web service. This, and future stages of the journey will be outlined. GridMon is not alone in developing a network monitoring system as a web and/or Grid service. Also described, as part of GridMon’s aim to be a “best of breed ” network monitoring system for UK e-Science, are ongoing collaborations such as those with the Internet2 piPEs initiative. Finally, consideration is given to new work which seeks to redress some of the widely observed imbalance between the achieved and expected network performance of end users. By building on relevant research, GridMon hopes to provide “best practice ” examples of TCP configuration, with our monitoring results showing these in a real world rather than ‘laboratory ’ context. Glossary