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Dag SoftwareResearcher: Jörg Micheel, WAND group, Computer Science Department, University of Waikato (New Zealand)Jörg Micheel, Data Network Researcher with the Waikato Applied Network Dynamics (WAND) group of the Computer Science Department at the University of Waikato (New Zealand), had the opportunity of visiting the Measurement and Analysis Group in June, with Prof. Ian Graham (Dean, School of Computing and Mathematical Sciences). During the visit, Jörg worked to improve the operational stability of the Dag3 cards, which are used in the passive monitors. Back at Waikato University, he works with Prof. John Cleary, head of the WAND group, on a passive network monitoring project involving long traces (24 hours) at a limited number of sites. In addition, he works with Prof. Graham as the release engineer of the Dag software, as the point of contact regarding bugs, and as the webmaster of the WAND and Dag Web sites. The architecture of the Dag3 software follows the classical approach as implemented in the OC3-mon/Coral monitors. Jörg is interested in developing this further by investigating a more modular approach, which should provide better scaling properties towards high bandwidth internet links. This approach challenges both the current measurement hardware and software. He hopes to create a new framework for network data measurements and processing. The Dag team has had two new software releases this year. The recent 2.1 software release covers a number of new features as well as bug fixes, such as Coral Reef support, multi-cell AAL5 capture, card synchronization (deploying DUCK technology), and support for the Dag4.0 (OC48 ATM) and Dag3.2E (10/100BaseT) cards. There is a separate package dagtools coming soon which deals with post-processing network traces, as captured by the Dag cards. A preliminary version (dagtools 0.8.1) is available from the Dag Web site (see pointers on the left).
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