node.js - Sending UDP messages from multiple worker processes -

in node.js i'm having problems using dgram child processes. if try send udp messages multiple worker processes, messages 1 of processes sent.

if run code below , run netcat listen on udp (nc -ul 8111), should see 1 of workers sending udp messages, though there multiple workers logging console.

const cluster = require('cluster'); const http = require('http'); const numcpus = require('os').cpus().length; const dgram = require('dgram');  function dosocketstuff() {   var socket = dgram.createsocket('udp4');   var workerid = cluster.ismaster ? 'master' : cluster.worker.id;    setinterval(() => {     console.log("worker " + workerid);     var message = new buffer("udp " + workerid + "\n");      socket.send(message, 0, message.length, 8111,  'localhost');   }, 1000);  }  if (cluster.ismaster) {   (var = 0; < numcpus; i++) {     cluster.fork();   }    cluster.on('exit', (worker, code, signal) => {     console.log(`worker ${worker.process.pid} died`);   }); } else {   dosocketstuff(); } 

i have seen issue on osx node.js 5.1.0 , on windows node.js 4.2.6.

this behavior comes netcat. quoting this answer:

when nc listening udp socket, 'locks on' source port , source ip of first packet receives.

if listen messages differently, should see them all. example:

require('dgram').createsocket('udp4')   .bind(8111)   .on('message', function (buf) { console.log(buf.tostring()); });