Application using Multicast IP settings

Hi,

We are using SCVMM 2012 R2. I have a windows 2012 R2 virtual machine which has two NIC (Live and Management), and is running an application which advertises to a multicast group ip address of 224.10.10.10 with a port of 31337, and the windows 7 clients are supposed to join this multicast group using the client application to listen for the server advertising packets.

However, the clients never receive any information from the server. I checked on the router and the server doesn't join the group. I've run a test program on the windows 7 clients with the ip address and port number above which sends an hello message to other clients running the client software which worked since it crashed the program on all those machines (they didn't know what to do with the hello message I sent them), so I know they are all listening and received the test data.

If I run another test program which has a server part which sends out a message (ip address above and port number), and a client test program (ip address above and port number), on the server to receive the message, this also works, since the client displays an hello message.

The part that doesn't work is the server sending out information and the clients receiving it (also tested with the server and client test app)

netstat on the server:

UDP    0.0.0.0:31337          *:*                                    3960

and on the client:

UDP    0.0.0.0:31337          *:*                                    5680

Previously we were using physical machines running windows 2003 with the same application and this worked fine. If I reboot this server, then check the router I see multicast information appearing.

If I run the following on the server: netsh interface ip show joins, it give the following information:

Interface 12: Live

Scope       References  Last  Address
----------  ----------  ----  ---------------------------------
0                    0  No    224.0.0.1
0                    1  Yes   224.0.0.252

Interface 13: Management

Scope       References  Last  Address
----------  ----------  ----  ---------------------------------
0                    0  Yes   224.0.0.1
0                    1  Yes   224.0.0.252
0                    1  Yes   224.10.10.10

The 224.10.10.10 appears on the management NIC which seems incorrect since it should appear on the Live NIC which has a default gateway configured (Management does not)

Are there any special settings I need to set on the Hyperv client? How do I get the multicast group to bind to the Live NIC.

I have set the live nic to be first in the list to be accessed by network services and IPv4 binds before IPv6.

Thanks.

Jaz