Modbus protocol detection is disabled in the NixOS build; the 5 Modbus
SIDs (2250005-2250009) cause the config test to fail and crash-loop the
service. Disable them alongside the existing DNP3 exclusions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Passive network monitoring via af-packet on eno1. Rulesets auto-updated
from ET/Open, abuse.ch, and other community sources via suricata-update.
Runs alongside fail2ban; IPS/blocking mode can be enabled later.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
