Ok, I really need help on this one.  I have two nics and I want to broadcast to "255.255.255.255".  What happens is that

 when I use INADDR_BROADCAST I get 192.168.0.255, which is en0.  The source address is 192.168.0.29.

I can deliberately broadcast using en1 in sendto with the broadcast address of en1, 192.168.75.255.  But that is not 
what I want to do.

What I want is to have a source IP of 192.168.75.80 (en1) and dest IP of 255.255.255.255.  At least that is what I think

 I want.

I have tried binding and IP_MULTICAST_IF.  Nothing seems to change the source to en1 and nothing seems to make any 
difference to the dest IP with the exception of changing sendto to the specific subnet.  I have tried to sendto "255.255

.255.255" and it still sends to 192.168.0.255.  This does not seem correct to me at all.

Can anyone help?  Thanx
Tim