Predictability and Security of High Performance Networks:
Expanding Control through Monitoring, Visualization and Analysis
Active measurement activitiesA major focus of CAIDA's NGI effort is the gathering and analysis of Internet traffic path data (connectivity, routing and performance), with the help of a tool called skitter. This tool intermittently sends ICMP packets to many destinations (thousands). The number of servers receiving measurement packets is so large that it is impossible for us to notify all of the administrators individually of the reason for the unusual ICMP traffic.
Some have mistaken our measurements as hostile activity. PLEASE note that CAIDA has no hostile intentions whatsoever. Our intent is measurement only, at a low enough frequency to not be a significant network resource consumer at an end site (typically one 52-byte packet every half hour or less).
CAIDA's measurement efforts are intended to help users, providers and researchers understand the complexities in the current and future Internet. skitter is intended to help us understand one part of the complexity: a large and varied worldwide topology.
The image displayed here is a visualization generated by Hal Burch of CMU during a summer internship with Lucent Bell Laboratories, using skitter data. In this picture, lighter colors represent links closer to the source and darker colors are used for links further from the source (by hop count).
More Information about the CAIDA NGI EffortReports, Presentations and the Original NGI proposal to DARPA
OC48MON2 performance graphs at Metromedia Fiber Network (MFN) in San Jose, CA
Passive monitoring with CoralReef
Skitter data use in the Research Community
Security Management in Next Generation Networks (Coral Security Applications)