I've been running into an odd issue lately as I deploy IPv6. I have several subnets that are IPv6 enabled and both Windows and Linux clients work fine on them but for some reason, Macs are occasionally refusing to talk on IPv6 outside their subnet. So long as the traffic is within the same subnet, it works. Removing and Re-adding the Ethernet adapter fixes the problem until the machine goes to sleep for an extended period at which point the problem resurfaces. I'm trying to find out from my imaging team what they're doing to the Macs to see if there's something they're doing that could cause this behavior but any other suggestions?