PFSense - Suricata - Alerts - SURICATA UDPv4 invalid checksum

Disable Hardware Checksum Offloading under System → Advanced → Networking.

Suppress

#SURICATA UDPv4 invalid checksum
suppress gen_id 1, sig_id 2200075

NOTE: Try toggling the Hardware Checksum Offloading.

If that does not do it, you can simply disable this particular rule by either clicking the red X icon on the Alerts tab in the GID/SID column, or you can find and selectively disable that rule on the Rules tab for the interface.

See this thread from the official Suricata documentation Wiki for details:

http://suricata.readthedocs.io/en/latest/performance/packet-capture.html.

Suricata uses PCAP for packet capture during Legacy Blocking Mode operation, and Netmap for Inline IPS Mode operation.

In both cases, hardware checksum offloading needs to be disabled.