Well, you can verify the bindings by doing a
"netstat -an" while the two receivers are running.
If either of the them has a "*" for the address listed
with your port, then that one didn't bind to a particular
group address, but rather INADDR_ANY.
You can also use strace or ltrace (with some
filtering, if it's too much) to see what arguments
you're getting to the socket, bind and send
system calls, which may also help.
+-DLS
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