multicast

问题 In Python when we want to make a script that listens for multicast traffic we set the IP_ADD_MEMBERSHIP option of the socket with a value that consists of the multicast group address and the address of a local interface on which it will listen for the group's traffic. Many examples on the Internet pass to IP_ADD_MEMBERSHIP the INADDR_ANY wildcard address as the local interface, and some of them state that this will make the socket to listen on all interfaces for multicast packets. However the

问题 i'm puzzeled after a few attempts to get a simple UDP multicast receiver working. After my own code did not work as expected i tried out the exact example posted in the vertx documentation: DatagramSocket socket = vertx.createDatagramSocket(new DatagramSocketOptions()); socket.listen(1234, "0.0.0.0", asyncResult -> { if (asyncResult.succeeded()) { socket.handler(packet -> { // Do something with the packet }); // join the multicast group socket.listenMulticastGroup("230.0.0.1", asyncResult2 ->

问题 Task at hand is to bind a socket specifically to address 1.0.0.2:520 (assigned to eth2), then read multicast UDP packets addressed to 224.0.0.9:520. I am trying the code below, based on https://godoc.org/golang.org/x/net/ipv4 Unfortunately, result is this debbuging message is never reached: log.Printf("udpReader: recv %d bytes from %s to %s on %s", n, cm.Src, cm.Dst, ifname) I know eth2 is receiving the desired packets because I have this packet sniffer running on it: sudo tcpdump -n -i eth2

问题 Task at hand is to bind a socket specifically to address 1.0.0.2:520 (assigned to eth2), then read multicast UDP packets addressed to 224.0.0.9:520. I am trying the code below, based on https://godoc.org/golang.org/x/net/ipv4 Unfortunately, result is this debbuging message is never reached: log.Printf("udpReader: recv %d bytes from %s to %s on %s", n, cm.Src, cm.Dst, ifname) I know eth2 is receiving the desired packets because I have this packet sniffer running on it: sudo tcpdump -n -i eth2

问题 I have two hazelcast configure yaml files: hazelcast-cluster1.yml: hazelcast: cluster-name: cluster1 network: join: multicast: enabled:false tip-ip: enabled: true member-list: machineA machineB hazelcast-cluster2.yml: hazelcast: cluster-name: cluster2 network: join: multicast: enabled:false tip-ip: enabled: true member-list: machineC machineD What I wanted is machineA and machineB forms a cluster while machineC and machineD does a separate cluster. However, when I started machineC, it forms a

问题 I have two hazelcast configure yaml files: hazelcast-cluster1.yml: hazelcast: cluster-name: cluster1 network: join: multicast: enabled:false tip-ip: enabled: true member-list: machineA machineB hazelcast-cluster2.yml: hazelcast: cluster-name: cluster2 network: join: multicast: enabled:false tip-ip: enabled: true member-list: machineC machineD What I wanted is machineA and machineB forms a cluster while machineC and machineD does a separate cluster. However, when I started machineC, it forms a

问题 I need to set IP_MULTICAST_LOOP on a multicast UDP connection/socket so I can send/receive multicast packets on my local machine. This is the call that I've found which should work: l, err := net.ListenMulticastUDP("udp4", nil, addr) file, err := l.File() fd := syscall.Handle(file.Fd()) err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, 1) However it fails with "not supported by windows". I'm pretty sure this is supported by sockets in windows, just not in the Go

问题 I need to set IP_MULTICAST_LOOP on a multicast UDP connection/socket so I can send/receive multicast packets on my local machine. This is the call that I've found which should work: l, err := net.ListenMulticastUDP("udp4", nil, addr) file, err := l.File() fd := syscall.Handle(file.Fd()) err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, 1) However it fails with "not supported by windows". I'm pretty sure this is supported by sockets in windows, just not in the Go

问题 I need to set IP_MULTICAST_LOOP on a multicast UDP connection/socket so I can send/receive multicast packets on my local machine. This is the call that I've found which should work: l, err := net.ListenMulticastUDP("udp4", nil, addr) file, err := l.File() fd := syscall.Handle(file.Fd()) err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, 1) However it fails with "not supported by windows". I'm pretty sure this is supported by sockets in windows, just not in the Go

问题 I need to set IP_MULTICAST_LOOP on a multicast UDP connection/socket so I can send/receive multicast packets on my local machine. This is the call that I've found which should work: l, err := net.ListenMulticastUDP("udp4", nil, addr) file, err := l.File() fd := syscall.Handle(file.Fd()) err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, 1) However it fails with "not supported by windows". I'm pretty sure this is supported by sockets in windows, just not in the Go