Listener rules allow one dual-stack NLB to direct IPv6 client traffic to IPv6 targets and IPv4 traffic to IPv4 targets, preserving client IP addresses natively without protocol translation or dual load balancers. This feature works on TCP, UDP, TCP_UDP, and TLS listeners and integrates seamlessly with existing NLB capabilities like connection draining and sticky sessions.
Available across AWS commercial and GovCloud regions at no additional cost beyond standard NLB usage fees, listener rules simplify multi-protocol traffic management and reduce the complexity and infrastructure footprint required to serve IPv4 and IPv6 clients concurrently.
Source & further reading
AWS Network Load Balancer now supports Listener Rules for custom traffic routing ↗Source published 2026-07-22. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.