multicast

I found recently that if I have a dial-up connection (this is for a kiosk) and a local area network connection, when the dial-up connection is established (with internet access), my multicast sendto would default to the dial-up rather than my LAN NIC. This made the multicast go out to the dial-up connection instead rather than to my LAN which has several multicast subscribers. I understand that I need to use IP_MULTICAST_IF to set the interface on my multicast socket. Question is how do I enumerate the interfaces and how do I use IP_MULTICAST_IF in setsockopt? On the kiosk Windows XP Embedded,

I am learning and trying to understand how Multicast is implemented in Java. I had developed a small program following the example given at http://www.nmsl.cs.ucsb.edu/MulticastSocketsBook/#javaexamples and it did do multicast of datagram (UDP) packets to multiple clients on same host. However when I tried to run clients on different machines (within same LAN (i.e. my home WiFi) no packets got received at client end. I made sure that my router's firewall was disabled as well as all other machines had a port open. Thinking my program could have some error, I took the examples, compiled them and

I need to come up with clients that can multicast to other clients reliably. That implies I'll be using TCP to connect reliably between clients within a multicast group. Doesn't that come up to n^2 number of connections? That seems a little silly to me. Wouldn't/shouldn't there be a way to more easily multicast with reliability? EDIT: UNIX/C EDIT: i didn't clarify how multithreading comes into play. but if i was to open up n^2 connections, i figured, i'd be multithreading and that's even more complication than i would want. There are several reliable multicast solutions. DDS (Data distribution

I have a server which sends UDP packets via multicast and a number of clients which are listing to those multicast packets. Each packet has a fixed size of 1040 Bytes, the whole data size which is sent by the server is 3GByte. My environment is follows: 1 Gbit Ethernet Network 40 Nodes, 1 Sender Node and 39 receiver Nodes. All Nodes have the same hardware configuration: 2 AMD CPUs, each CPU has 2 Cores @2,6GHz On the client side, one thread reads the socket and put the data into a queue. One additional thread pops the data from the queue and does some light weight processing. During the

I am trying to get my head around how multicasting works in MSMQ but I cannot receive messages at all, even from the same machine. I'm obviously doing something wrong but cannot see what. Here's where I'm at: I manually created a non-transactional private queue called MulticastTest and then set the Multicast address to 234.1.1.1:8001 . Then my test sending app does this: MessageQueue queue = new MessageQueue("FormatName:MULTICAST=234.1.1.1:8001"); queue.Send("Hello World"); This works, it at least seems to send the message which I see in an outgoing queue on the same machine. At least I assume