analyses the number of clients that cause traffic during a given time on a Freifunk gateway

traffic-analysis.sh

duration=$1
tmp=/tmp/traffic.tmp
localnet="10.116.128.0/17"
iface=br-ffki
echo capturing for $duration seconds
(
    sleep $duration
    pkill -f tcpdump
) & 
tcpdump -q -n -i $iface src net $localnet and dst net ! $localnet and dst net ! 224.0.0.0/4 and ! arp | \
    cut -d" " -f3 | \
    cut -d"." -f1-4 | \
    sort | uniq -c | sort -nr > $tmp; 
cat $tmp
echo -n "clients that caused traffic during the last $duration seconds: "
wc -l < $tmp
rm $tmp