Animated Reachability Graph

Les Cottrell, Last Update: November 9, 1996

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Reachability of Hosts that SLAC Pings

SLAC pings about 50 hosts in about 12 countries. They are grouped into 5 groups: ESnet hosts, Western half of N. America, Eastern half of N. America, International (Europe & Japan), and ISDN/ISP hosts in the San Francisco Bay Area. The animated graph below shows the average unreachability, where:
unreachability = 1 - reachability, and
reachability = # 30 min intervals for which the host was unreachable / Total # intervals

To replay the animation click on your browser's reload button. [a 3D Excel plot of % unavailable vs. host vs. month]

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Les Cottrell