| Graph of Network status check |
|---|
| The graph displays the results of checking network connectivity
from two different locations, to both the outside internet, and
to the SETI@Home data server machine sagan . The first
test site is the machine iosef at SSL Berkeley, the
second test site is a machine in Santa Cruz, CA.
The links are checked every 12 minutes with the 'ping' function.
Over time, the graph fills in from left to right as lines are
drawn vertically for every 12 minute test cycle.
|
| Any shade of green indicates a functional pathway.
Any red indications indicate failures between the links.
A blank section on the graph would indicate that the check was
not performed. (check machine could be off) Periodic blank
lines in the graphs are graphing artifacts.
|
| The data server is in trouble when iosef can ping
the internet but it can not ping sagan. Such outages
are very rare since iosef and sagan are on
the same LAN network.
|
| The second indication of trouble would be when the
Santa Cruz machine can ping the internet, but it can
not ping sagan. Such failures can happen intermittantly
due to network congestion.
|
| If either of these two error conditions occur for two
12 minute test cycles in succession, the data server is probably
definately in trouble and the SETI pager is activated
by email.
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project, The Search for Extraterresterial Intelligence