Layer 4 Concepts Apr 2, 2021 Share on: Top > Ingress and Egress > Layer 4 > Layer 4 Concepts Stateless Firewall - A stateless firewall operates at the raw IP packet level and requires the specification of both inbound and outbound access for "duplex" protocols like HTTP, SSH, etc. 🌐 Before You Leave 🤘 Subscribe to my 100% spam-free newsletter! Email: