Is there a known host address that you can only ping thru the ppp interface?
If so, you might script a ping test, then let X act based on the result
code. Something like this might work:
#Wait for 4 'echo reply's or 10 seconds, whichever is greater
#NOTE: -w does not work under kernel 2.2.12-20 (RH 6.1).
# It does work under kernel 2.2.16-22 (RH 7.0) and under
# kernel 2.2.16-3 (RH 6.2), or maybe its the ping version?
ping -c 4 -w 10 $dest
rc=$?
if [ $rc = 0 ]; then
... success ...
else
... failure ...
fi
$dest can be a command line entry, or you can code it directly into the
script. To test failed attempts, ping www.microsoft.com. :)
bd
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