No answer I'm afraid but I can confirm the symptoms and the cause. It's definitely the Intel i217-LM chipset that's causing the problem when the PC's go to sleep.
INTEL ARE YOU AWARE OF THIS PROBLEM AND IS THERE A FIX? It is a REAL issue that has the potential to kill a network and, believe me, it's not easy to track down the cause. We have spent 30+ hours on investigations to nail this problem to your chipset and it would be nice to know whether there is a fix. It seems to affect machines from all manufacturers (Dell and HP to name two) so it's not a PC manufacturer problem, it's an INTEL PROBLEM. Please provide a fix ASAP.
We found *exactly* the same case on HP EliteONe 800 with I217LM Ethernet.
12machines killing totally the local area network during 15 minutes once a day !
See ICMPv6 'Multicast Listener Report' messages are flooding the local network
Answer of Microsoft is : change Ethernet card or turn off IPv6 or turn off sleeping state ! But it does only mask the REAL problem.
PLEASE Intel, could you give information about this issue ?
I have the same problem with Intel I217-LM NIC. I am using Win 7 64 bit OS and am looking for the driver update to fix the problem with ICMPv6 multicast listener flooding. All I see is the drivers for Win 8. Can you point me in the right direction please. I initiated the temporary fixes of disabling IPV6 and Wake on LAN...