IPv6
2 posts tagged IPv6.
Dual-stack on a Network Load Balancer is a listener rule, not a checkbox
Flip an NLB to dualstack and IPv6 clients connect, but every one of them reaches an IPv4 target as the load balancer's own address, because translated traffic is never source-preserved. The fix is a listener rule that routes by address family to an IPv6 target group, and it brings four requirements the checkbox never mentioned, one of which makes a UDP service fail to build at all.
Networking7 minA 200 millisecond penalty is what a completely broken IPv6 path looks like
Happy Eyeballs means a dead address family costs you latency instead of errors. The fixed delay on dual-stack destinations is a specific enough fingerprint to diagnose from, and it can sit unnoticed indefinitely.
Networking7 min