FIPS stands for Federal Information Processing Standards and you can read more about it at


This is an enterprise-level feature of Security Onion. Contact Security Onion Solutions, LLC via our website at for more information about purchasing a Security Onion Pro license to enable this feature.

Enabling FIPS During the ISO Install

The recommended way to use FIPS with Security Onion is to install via our Security Onion ISO image. At the ISO boot menu, you’ll need to modify the boot command. This can be done using the e key in UEFI boot mode or the Tab key in BIOS boot mode before it automatically boots. Then append fips=1 (and possibly other options like LUKS and STIG) to the boot parameters and continue the boot process.