AZ497428 - Generally Available: FQDN Filtering in DNAT rules in Azure Firewall

Azure Updates

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Last Updated

Jul 1, 2025

Published Jun 30, 2025

Status

Launched

Timeline

  • June 2025
    General Availability

Product

Azure Firewall

Tag

Features
Security

Category

Networking
Security

Description

Azure Firewall supports the use of Fully Qualified Domain Names (FQDNs) in DNAT (Destination Network Address Translation) rules, allowing inbound traffic to be routed to backend resources using domain names instead of static IP addresses.  

 

This feature is especially useful for scenarios where backend IP addresses are dynamic or centrally managed via DNS.  

 

Key Highlights: 

  • DNS-based backend targeting: Route inbound traffic to backend servers using FQDNs.  
  • Dynamic IP support: Ideal for applications where backend IPs change frequently.  
  • Monitoring: Monitor DNAT activity using AZFWNatRule logs. 

Learn more: