Scale of Measurements
18 Monitoring sites - 7 in US (5 ESnet, 2 vBNS), 2 in Canada, 7 in Europe (ch, de, dk, hu, it, uk(2)), 2 in Asia (jp, tw)
1261 monitoring-remote-site pairs
379 unique hosts, 272 sites
50 beacon sites, 27 countries
Metrics include response, jitter, loss, reachability
1 Million probes of Internet / day