In general this is not possible since multicast packets aren’t routed. There are some techniques to work around this (DVMRP, MOSPF and others) but they all require that you can configure all the routers between your server and the clients (or create a tunnel). There are backbone networks (Abilene, Mbone) with multicast support, but those … Read more
The short answer: io.sockets.adapter.rooms I analysed io: I got the following output: { server: { stack: [ [Object], [Object], [Object], [Object], [Object], [Object] ], connections: 3, allowHalfOpen: true, watcher: { host: [Circular], callback: [Function] }, _events: { request: [Function], connection: [Function: connectionListener], listening: [Object], upgrade: [Object] }, httpAllowHalfOpen: false, cache: {}, settings: { home: “https://stackoverflow.com/”, … Read more
After some years facing this linux strange behaviour, and using the bind workaround describe in previous answers, I realize that the ip(7) manpage describe a possible solution : IP_MULTICAST_ALL (since Linux 2.6.31) This option can be used to modify the delivery policy of multicast messages to sockets bound to the wildcard INADDR_ANY address. The argument … Read more
To bind a UDP socket when receiving multicast means to specify an address and port from which to receive data (NOT a local interface, as is the case for TCP acceptor bind). The address specified in this case has a filtering role, i.e. the socket will only receive datagrams sent to that multicast address & … Read more
This works for me: Receive import socket import struct MCAST_GRP = ‘224.1.1.1’ MCAST_PORT = 5007 IS_ALL_GROUPS = True sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) if IS_ALL_GROUPS: # on this port, receives ALL multicast groups sock.bind((”, MCAST_PORT)) else: # on this port, listen ONLY to MCAST_GRP sock.bind((MCAST_GRP, MCAST_PORT)) mreq = struct.pack(“4sl”, socket.inet_aton(MCAST_GRP), socket.INADDR_ANY) sock.setsockopt(socket.IPPROTO_IP, … Read more