case $SYSTYPE in
*BSD)
$IFCONFIG | grep "$ipaddr" -B4 | grep "UP," | cut -d ":" -f 1
$IFCONFIG | grep "$ipaddr " -B20 | grep "UP," | tail -n 1 | cut -d ":" -f 1
return 0;;
*)
: "comparing $ipaddr to $addr (from ifconfig)"