statelessFragmentDefaultActions

The actions to take on a fragmented UDP packet if it doesn't match any of the stateless rules in the policy. Network Firewall only manages UDP packet fragments and silently drops packet fragments for other protocols. If you want non-matching fragmented UDP packets to be forwarded for stateful inspection, specify aws:forward_to_sfe.

You must specify one of the standard actions: aws:pass, aws:drop, or aws:forward_to_sfe. In addition, you can specify custom actions that are compatible with your standard section choice.

For example, you could specify ["aws:pass"] or you could specify ["aws:pass", “customActionName”]. For information about compatibility, see the custom action descriptions under CustomAction.