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I340-T4 adapter dropping multicast packets if other mcast socket is closed

I have experiencing a UDP Multicast packet drop with Intel I340-T4 quad port network adapter.

I believe this is caused by open/close Multicast receiving socket on the same physical network port.

Here is my setup:

OS: Windows Server 2003

I340-T4 Driver version 11.4.7.0

Multicast receiving socket which suffer dropped MCast packet:

- MCast IP: 234.234.234.234

- Port: 12345

- Interface: 192.168.8.11

- receving a 14MBit source

- experience packet drop once every 1 min

Open and closing socket:

open a socket, listen to a source for 2 second, then close it. Repeat this cycle every 4 second.

Socket 1

- MCast IP: 234.234.234.234

- Port 12345

- Interface: 192.168.8.11

- receive a 14MBit source

Socket 2 - 7

- MCast IP: 225.1.1.2

- Port 25000

- Interface: 192.168.8.11

- no source

Socket 8 

- MCast IP: 225.1.1.3

- Port 25000

- Interface: 192.168.8.11

- no source

Control socket:

Receive the same MCast source, from the same NIC card, but different physical port.

NO packet drop.

- MCast IP: 234.234.234.234

- Port 12345

- Interface: 192.168.9.11

- receive a 14MBit source

So far we believe it's likely a driver problem.

Can you confirm it?

Thanks!

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