default_route=$(ip route show)
default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n 1)
address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')

#ip address
ip=$(echo $address | awk '{print $1 }')
ip=${ip%%/*}

#broadcast
broadcast=$(echo $address | awk '{print $2 }')

#mask address
mask=$(route -n |grep 'U[ \t]' | head -n 1 | awk '{print