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How to optimize DNS for dual-stack networks

Networking & Content Delivery Blog

This post discusses how to optimize DNS for dual-stack (IPv4 and IPv6) networks during a phased IPv6 deployment. It covers challenges that can arise when a node has connectivity to IPv4 destinations but limited connectivity to IPv6 destinations, causing connections to prefer IPv6 and time out before falling back to IPv4.

Specifically, the article covers:

  • The considerations for a phased IPv6 deployment
  • The challenges of dual-stack connectivity with limited IPv6 paths
  • Modifying operating system settings to influence IPv4 vs. IPv6 preference
  • Using CoreDNS in Kubernetes to filter out AAAA (IPv6) records
  • Using AWS Route 53 Resolver DNS Firewall to filter AAAA records at the VPC level
  • Conclusion on recommended approaches during IPv6 adoption
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