IDS

• snort
• suricata
• Suricata + extras: SELKS

Only logs alerts. Need other tool to grep logs and send emails.

/etc/suricata/local.rules

alert udp !$DHCP_SERVERS 67 -> any 68 (msg:"detect rogue DHCP servers!"; sid:123456789;)
#alert udp !$DHCP_SERVERS 67 -> 255.255.255.255 any (msg: "detect rogue DHCP server!"; sid:1000001;)

3 method of installation:

• source
• docker image
• debian based ISO distro