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Detect DHCP Servers With Systemd

Created by dave. Last edited by dave, 4 years and 360 days ago. Viewed 1,293 times. #3
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Need to detect DHCP servers on the local network.

Pretty Crude Solution



[Service] Type=forking ExecStart=/usr/bin/flock /var/lock/dhcp-monitor /usr/local/sbin/start-dhcp-monitoring




tcpdump -i ens192 -nev udp src port 67 | egrep 'Broadcast|bootps' | logger -t dhcp-monitor &

Alerting on rogue DHCP servers is left as an exercise for the reader.

Like I said, crude.

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