+fairoot="$1"
+iface="eth0"
+
+[ "$2" ] && iface="$2"
+
+myip="`ifconfig $iface | grep inet\ addr | awk '{ print $2 }' | awk -F: '{ print $2 }'`"
+
+if [ -z $myip ] ; then
+ echo "unable to figure out your ip addr."
+ echo "pls specify the network interface."
+ echo
+ echo "example: $0 $1 br0"
+ echo
+ exit
+fi