multicast

Im trying to write a server/service that broadcasts a message on the lan ever second or so, Kind of like a service discovery. The message needs to be received by multiple client programs that could be on the same machine or different machines. But there could be more than one program on each machine running at the same time. Im using delphi7, with indy 9.0.18 where im stuck is if i should be using UDP(TIdUDPClient/Server) or IP MultiCast (TIdIPMCastClient/Server) or if its even possible... Ive managed to get it to work with IP Multi Cast with one client per machine, but even after many trys

I'm looking at taking a set of objects, let's say there's 3 objects alive at the moment, which all implement a common interface, and then wrap those objects inside a fourth object, also implementing the same interface. The fourth object's implementations of methods and properties would simply call the relevant bits on those 3 underlying objects. I know that there will be cases here where it won't make sense to do that, but this is for a service multicast architecture so there's already a good set of limitations in place. My question is where to start. The generation of that fourth object

So, I've been trying to figure out exactly why this isn't working but I haven't a clue. I've managed to send packets from the iPhone and receive them on my Mac. And according to tcpdump my mac is correctly sending the packets. Additionally, if I run this in the simulator it works fine. This leads me to believe that it's a network problem, but I have no idea what that could be, so I was hoping(!) that it's something below. CFSocketContext socketContext = {0, self, NULL, NULL, NULL}; advertiseSocket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_DGRAM, IPPROTO_UDP, kCFSocketDataCallBack,

I have two programs: server ... it generates UDP traffic on a chosen multicast listener ... it prints UDP traffic on a chosen multicast (it subscribes to a multicast and prints whatever it receives). When I run the server on one machine and listeners on some (other) machine(s), the listener sees UDP traffic and prints it correctly. So these programs should be in a good shape. However, when I try to capture the traffic, on whatever machine, with tcpdump: sudo tcpdump -i eth0 'dst 233.65.120.153' -w 0.pcap and when I later try to replay it, on whatever machine, with tcpreplay: sudo tcpreplay -i

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done on fedora core 17 Linux. The idea is to receive a video stream via RTSP/HTTP or any other network protocol and multicast it on the loopback address so that I can use VLC to play the stream using multicast address. Leaving aside other bitrate and controlled multicast issues, I tried to read one video file and multicast on loopback device. But when tried to play the same on vlc it didn't worked. I'm able to see packet getting transmitted in wireshark but the src ip is taken from my