The internal and external passthrough Network Load Balancers now support load balancing to unmanaged instance groups comprised of IPv6-only VM instances

## Feature The internal and external passthrough Network Load Balancers now support load balancing to unmanaged instance groups comprised of IPv6-only VM instances. Protocol forwarding also supports IPv6-only target instances. For more details, see the following pages: * [Protocol forwarding overview](https://cloud.google.com/load-balancing/docs/protocol-forwarding) * [Backend service-based external passthrough Network Load Balancer overview](https://cloud.google.com/load-balancing/docs/network/networklb-backend-service) * [Internal passthrough Network Load Balancer overview](https://cloud.google.com/load-balancing/docs/internal) * [Set up an internal passthrough Network Load Balancer with IPv6-only subnets and backends](https://cloud.google.com/load-balancing/docs/internal/setting-up-internal#configure-ipv6-only) This feature is available in **General Availability**.