Difference betwen down and unreachable

[stan]

I had a machine that was restored from an old backup tape, and did not have
it's external facing NIC configured for a few days last week. Nagios
reported it as down, rather than unreachable. How is this determined?

-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.

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