Introduction In real-world enterprise networks, it is common to access DMZ servers using a public IP address, even from internal LAN users. This design improves consistency, simplifies DNS, and mirrors real internet access behavior. In this blog, I will demonstrate User NAT / Destination NAT (UNAT) configuration on a Palo Alto Networks firewall using a practical lab setup with LAN, WAN, and DMZ zones. This guide explains how traffic from a LAN PC reaches a DMZ mail server using its public IP, with UNAT applied on the firewall. Zone and IP Design Zone Network Purpose LAN 192.168.10.0/24 Internal users WAN…