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I'm using the standard Windows PGM socket implementation (also known as the "MSMQ PGM"), with RDM socket type. I have noticed that, as per this Microsoft link, the MulticastLoopBack socket option cannot be set.

In other words, the rather familiar syntax:

_socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastLoopback, 0);

will throw an invalid argument error.

Is anybody aware of any alternative means to disable multicast loopback on a PGM socket instance? Anything from the cleanest one-liner to a registry hack would be very welcome.

vanni.torelli
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  • This is from a private e-mail reply from Mike Rettig, author of Emcaster. _No, I don't know of an option to disable loopback. If one does not exist, it could be implemented within the library based upon the source ip of the message._ – vanni.torelli Apr 15 '12 at 01:10

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