May 28, 2009 · How should I choose an IPv4 multicast address for my application's use? I may need more than one (a whole range perhaps ultimately) but just want to avoid conflicts with other applications. Packets will be entirely contained within an administrative domain, probably a LAN

May 31, 2013 · It's possible that your switch is multicast aware, but if IGMP is disabled it won't notice if any attached hardware subscribes to a particular multicast group so it wouldn't forward those packets. To test this, temporarily connect two machines directly together with a cross-over cable. That should (AFAICR) always work.

Sep 12, 2013 · Depending on what you're doing, there's a Win32 method that might help. It'll return the best interface for a given IP address. To get the default one (the 0.0.0.0), which is usually what you want for multicast, it's pretty easy: P/Invoke signature:

May 22, 2012 · The "join multicast group" operation (IP_ADD_MEMBERSHIP) is needed because it basically tells your network adapter to listen not only for ethernet frames where the destination MAC address is your own, it also tells the ethernet adapter to listen for IP multicast traffic as well for the corresponding multicast ethernet address. Each multicast IP ...

Nov 4, 2019 · There are several reasons not to work multicast in windows 10. I have solved it by following 2 steps: Interface Metric: From network settings, go to advance option and uncheck Automatic metric and set Interface matric a number. Lower the prior. Change C# code: By default, multicast send data to loopback interface. Hence need to specify which ...

Jun 23, 2017 · If the multicast connection is supporting UDP then the multicast port should be set to 4003. The only reason I can think of for the "multicast port" distinction is if a socket connection were opened for some protocol other than UDP or TCP, but a TCP/UDP multicast connection was needed for the same remote host.

Feb 5, 2009 · As I said, multicast is a property of Internet Protocol, not of WCF or any other library. It is up the ISP/network admin to determine whether or not multicasting is supported. I don't believe that you can write to multicast addresses using TCP, so WCF won't be possible :(. –

Oct 15, 2011 · Multicast requirements add time / cost to any application deployment timelines The software developer otherwise doesn't want to invest the time and energy wrestling with various host OS IGMP stacks and other multicast infrastructure complications

Binding to your multicast address will prevent this and ensure you only get multicast packets on that port. EDIT: Fixed the code based on above comment, binding to multicast address, stored in 'group', as opposed to INADDR_ANY to receive only multicast packets sent to multicast address.

Oct 14, 2015 · Of course, one can ensure that multicast datagram never leave A, by creating and enforcing a loopback device for multicast: sudo ifconfig lo multicast sudo route add -net 224.0.0.0 netmask 240.0.0.0 dev lo But now, if I want to consume the UDP datagram simultaneously in another linux box, say, "B", there is no way they arrive there.