From the project home page:

Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF). Suricata is developed by the OISF and its supporting vendors.

Install the suricata^AUR package.

The main configuration file is /etc/suricata/suricata.yaml.

You should change the following parts of the configuration in order to make it run:

 default-log-dir: /var/log/suricata/ # where you want to store log files
 classification-file: /etc/suricata/classification.config
 reference-config-file: /etc/suricata/reference.config
 HOME_NET: "[10.0.0.0/8]" # your local network
 host-os-policy: .. # according to the OS running the ips
 magic-file: /usr/share/file/misc/magic.mgc

You may use Scirius CE [1] or SELKS [2] as web interface for rule management, log analysis, and other sensor management options.

You may start the suricata service manually with: # /usr/bin/suricata -c /etc/suricata/suricata.yaml -i eth0

To start Suricata automatically at system boot, enable suricata.service.