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#! /bin/sh
#
# Set the IFS parameters for an interface configured for
# point-to-point use at a specific distance. Based on a
# program by Gunter Burchardt.
#
DEV=ath0
d=0
usage()
{
echo "Usage: $0 [-i athX] [-d meters]"
exit 2
}
args=`getopt d:i: $*`
test $? -ne 0 && usage
set -- $args
for i; do
case "$i" in
-i) DEV="$2"; shift; shift;;
-d) d="$2"; shift; shift;;
--) shift; break;
esac
done
test $d -eq 0 && usage
slottime=`expr 9 + \( $d / 300 \)`
if expr \( $d % 300 \) != 0 >/dev/null 2>&1; then
slottime=`expr $slottime + 1`
fi
timeout=`expr $slottime \* 2 + 3`
printf "Setup IFS parameters on interface ${DEV} for %i meter p-2-p link\n" $d
ATHN=`echo $DEV | sed 's/ath//'`
sysctl dev.ath.$ATHN.slottime=$slottime
sysctl dev.ath.$ATHN.acktimeout=$timeout
sysctl dev.ath.$ATHN.ctstimeout=$timeout
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