We use a load balancer product that is Linux-based. It defaulted to blocking all IPv6 ICMP, including neighbor discovery. This made IPv6 not work at all. It was

We use a load balancer product that is Linux-based. It defaulted to blocking all IPv6 ICMP, including neighbor discovery. This made IPv6 not work at all. It was a struggle to get them to fix it. And I don't think they've released the update with the fix yet either.