FWIW, here's what I use. Requires net/fping.
#!/bin/sh
target=ip.address.of.next.hop.out
echo "- Started at `date`"
is_dead=0
while true; do
fping -q $target
fping_rc=$?
if [ $is_dead -eq 0 -a $fping_rc -gt 0 ]; then
echo "! Failure at `date`"
is_dead=1
fi
if [ $is_dead -eq 1 -a $fping_rc -eq 0 ]; then
echo " Alive at `date`"
is_dead=0
fi
sleep 30
done
--
James.
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