Node.js socket.setMulticastTTL() Method Last Updated : 11 Apr, 2023 Comments Improve Suggest changes Like Article Like Report The socket.setMulticastTTL() is an inbuilt application programming interface of class Socket within dgram module which is used to set or clear the IP_MULTICAST_TTL socket option which helps to specify how many numbers of IP hops that a packet is allowed to travel through the specified multicast traffic. Syntax: const socket.setMulticastTTL( ttl ) Parameters: This method takes an integer value representing the number of IP hops that a packet is allowed to travel through the specified multicast traffic. Return Value: This method does not return any value. Example 1: Filename: index.js javascript // Node.js program to demonstrate the // server.setMulticastTTL() API // Importing dgram module const dgram = require('dgram'); // Creating and initializing client // and server socket let client = dgram.createSocket("udp4"); let server = dgram.createSocket("udp4"); let broadcast_address = 12345; // Handling the message event server.on("message", function (msg) { // Displaying the client message process.stdout.write("UDP String: " + msg + "\n"); // Exiting process process.exit(); }) .bind(broadcast_address, () => { // Enable the IP_MULTICAST_TTL socket option // and specifying the number of IP hopes // by using the setMulticastTTL() method server.setMulticastTTL(144); }); // Client sending message to server client.send("Hello", 0, 7, broadcast_address, "localhost"); Output: UDP String: Hello Example 2: Filename: index.js javascript // Node.js program to demonstrate the // server.setMulticastTTL() API // Importing dgram module const dgram = require('dgram'); // Creating and initializing client // and server socket let client = dgram.createSocket("udp4"); let server = dgram.createSocket("udp4"); // Handling the message event server.on("message", function (msg) { // Displaying the client message process.stdout.write("UDP String: " + msg + "\n"); // Exiting process process.exit(); }); // Handling the listening event server.on('listening', () => { const address = server.address(); console.log(`server listening ${address.address}:${address.port}`); }); // Binding server with port address server.bind(1234, () => { // Enable the IP_MULTICAST_TTL socket option // and specifying the number of IP hopes // by using the setMulticastTTL() method server.setMulticastTTL(255); }); // Client sending message to server client.send("Hello", 0, 7, 1234, "localhost"); Run the index.js file using the following command: node index.js Output: server listening 0.0.0.0:1234 UDP String: Hello Reference: https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_setmulticastttl_ttl Comment More infoAdvertise with us Next Article Node.js socket.unref() Method R rohitprasad3 Follow Improve Article Tags : Web Technologies Node.js Node.js-Methods Similar Reads Node.js socket.address() Method The socket.address() method is an inbuilt application programming interface of class Socket within dgram module which is used to get the object which contains the address information for the socket. 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