Understanding Snort Rules – ‚alert udp any any -> any 67‘ Message „Possible DHCP server“ will alert if a TCP packet is sent from any source to any destination on port 67 potentially indicating a DHCP server this rule can be used to identify and alert on potential DHCP server activity on the network

05/07-10:15:17.565258 [**] [1:527:8] BAD-TRAFFIC same SRC/DST [**] [Classification: Potentially Bad Traffic] [Priority: 2] {UDP} 0.0.0.0:68 -> 255.255.255.255:67

root@rpi-iot-jsho-snort-02:~# vi .swatchrc
ignore /0.0.0.0:68 -> 255.255.255.255:67/
watchfor /Priority\: [1-3]/
echo=normal
mail=js@dpsolution.de,subject=[SNORT] Priority [1-3] Alert

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