RRDFile=/home/db/work/rrdtool/bandwidth.rrd
network_interface=nve0

while [ 1 ]
do
        data=`/usr/bin/netstat -ib | /usr/bin/grep $network_interface | /usr/bin/grep Link | /usr/bin/awk '{ print $7":"$10; }'`
        /usr/local/bin/rrdtool update $RRDFile "N:$data"
        sleep 5
done