and a helper script tcpdump_postproc.sh for some postprocessing:
#!/bin/bash tcpdump -iany -G $((30*60)) -n -w tcpdump.io.%F_%H%M%S.pcap -z ./tcpdump_postproc.sh net 192.168.1.0/24 or net 192.168.2.0/24 > tcpdump.statistics ./tcpdump_postproc.sh
#!/bin/bash gzip *.pcap find . -maxdepth 0 -mmin +$((12*60)) -name '*.pcap.gz' -delete
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