Pardon my post if this is not the appropriate list - I looked at darwin-userlevel and it seemed too general. If this isn't the appropriate place, please let me know. I'm working on my cocoa application, which does some network communication. I am using sockets with the sin_addr portion of the sockaddr_in set to INADDR_BROADCAST. I have run into a problem and need some help. I need to send a general network broadcast (IP = 255.255.255.255), but under BSD implementations of sockets, if I specify the general broadcast address, the sockets layer automatically masks it to the interface's subnet, thus creating a subnet broadcast (e.g. if the subnet mask is 255.255.255.0 and my IP is 192.168.20.73, then the broadcast would be 192.168.20.255). I MUST have a full general broadcast. Steven's book says that BSD v3.0 includes a new flag IP_ONESBROADCAST (pg 471) that will do this, but I can't find any reference to this in the OS X headers or documentation (or man pages). Does anyone know how to get OS X to send a general broadcast instead of a subnet broadcast? Robert Palmer, Jr ----------------------------- Robert G. Palmer, Jr. Lead Engineer, 360 Video Surveillance Internet Pictures Corp. robert.palmer@ipix.com (865) 220-6574 _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.