Multicast on PXI using multiple PXI-8231s

Hi,
I am seeing some very weird behavior when trying to use multicast on my
PXI chassis. The chassis contains two PXI-8231 Ethernet modules. I
would like to send multicast messages out the two different modules. I
used the write only Open UDP Multicast vi, passing in the individual
net addresses for the two different cards. Both ports seem to open ok,
but when I go to send traffic... instead of appearing on both network
cards, all the data is sent out the same card. Changing the data for
the second card to a different multicast group did not remedy the
situation.
Any suggestions?
Angela

Hi,
I have some additional questions for you to help troubleshoot this issue. Can you confirm that both cards work individually? If you remove one of the cards, can you send out data from the other card? This will help confirm that the network settings and the hardware are working correctly.
What operating system are you using? Below is a link that describes how to use two network cards in a Real Time application.
http://digital.ni.com/public.nsf/websearch/44318045C524C9CF8625713E0047D1A1?OpenDocument
From other discussion forums, it looks like the network card that the application uses will be controlled by the operating system.
http://forums.ni.com/ni/board/message?board.id=170&message.id=29987&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&message.id=52020&requireLogin=False
Please let me know if you have any questions about this. Have a great afternoon!
Regards,
Missy S.
Calibration Engineer
National Instruments

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