Stop the CNAME chain struggle: Simplified management with Route 53 Resolver DNS Firewall

This article discusses a new feature in Amazon Route 53 Resolver DNS Firewall that simplifies the management of DNS resolution chains involving CNAME, DNAME, or Alias records.

Specifically, the article covers:

• The purpose of DNS Firewall in protecting against security risks like malicious code exfiltrating data via DNS requests
• The challenge of configuring DNS Firewall rules to allow resolution of domains that involve redirection chains (CNAME, DNAME, or Alias records)
• A new parameter in the UpdateFirewallRule API to automatically trust all domains in a redirection chain for a domain specified in the DNS Firewall rule
• A step-by-step example demonstrating how to update a DNS Firewall rule to trust the redirection chain for alexa.amazon.com
• The benefit of this feature in simplifying DNS Firewall management without needing to manually maintain lists of authorized domains in redirection chains