[oclug] Netcraft.com uptime
David F. Skoll
dfs at roaringpenguin.com
Mon Jan 8 15:51:15 EST 2001
Remember a long time ago I asked how Netcraft can remotely determine
the uptime of a Linux box?
I figured out how it's done. Linux sends a "timestamp" option with
some TCP packets. This timestamp contains the number of jiffies
(hundredths of a second) since the system was booted.
I'm sure it would be a tiny patch to add, oh I don't know, 300 days of
uptime to all the TCP timestamps, so Netcraft suddenly thinks Linux boxes
are extremely reliable. :-)
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