Node's TCP sockets hardcode SO_REUSEADDR by default and this cannot be changed

output.txt

Using IPv4 unspecified address 0.0.0.0
Using IPv6 unspecified address ::
Interface lo0 has address ::1
Interface lo0 has address 127.0.0.1
Interface lo0 has address fe80::1%lo0
Interface en0 has address 192.168.1.7
Starting too many servers on port 4567...
Listening on 0.0.0.0 port 4567
Listening on :: port 4567
Listening on ::1 port 4567
Listening on 127.0.0.1 port 4567
Listening on fe80::1%lo0 port 4567
Listening on 192.168.1.7 port 4567
Started 6 servers
Connecting to 0.0.0.0 port 4567
Connecting to :: port 4567
Connecting to ::1 port 4567
Connecting to 127.0.0.1 port 4567
Connecting to fe80::1%lo0 port 4567
Connecting to 192.168.1.7 port 4567
Got connection on ::1 port 4567
Got connection on ::1 port 4567
Got connection on 127.0.0.1 port 4567
Got connection on 127.0.0.1 port 4567
Got connection on fe80::1%lo0 port 4567
Got connection on 192.168.1.7 port 4567
Message on ::1 port 4567: "hello ::"
Message on ::1 port 4567: "hello ::1"
Message on 127.0.0.1 port 4567: "hello 0.0.0.0"
Message on 127.0.0.1 port 4567: "hello 127.0.0.1"
Message on fe80::1%lo0 port 4567: "hello fe80::1%lo0"
Message on 192.168.1.7 port 4567: "hello 192.168.1.7"

thanks-node-thats-great.js

#!/usr/bin/env node

var net = require('net');
var os = require('os');
var interfaces = os.networkInterfaces();

var hosts = ['0.0.0.0', '::'];
Object.keys(interfaces).forEach(function(interfaceName) {
    var interface = interfaces[interfaceName];
    interface.forEach(function(info) {
        var address = info.address;
        // append the interface name onto link-local IPv6 addresses
        // http://stackoverflow.com/a/34275391
        if (address.indexOf('fe80:') === 0) {
            address += '%' + interfaceName;
        }
        console.log('Interface ' + interfaceName + ' has address ' + address);
        hosts.push(address);
    });
});

var port = 4567;

function createServer(host) {
    return new Promise(function(resolve, reject) {
        var server = net.createServer();
        server.listen({ host: host, port: port }, function() {
            console.log('Listening on ' + host + ' port ' + port);
            server.on('connection', function(socket) {
                console.log('Got connection on ' + host + ' port ' + port);
                var buffer = [];
                socket.on('data', function(data) {
                    buffer.push(data);
                });
                socket.on('end', function() {
                    console.log('Message on ' + host + ' port ' + port + ':',
                        JSON.stringify(buffer.join('')));
                });
            });
            resolve(server);
        });
        server.on('error', reject);
    });
}

function connectClient(host) {
    return new Promise(function(resolve, reject) {
        console.log('Connecting to ' + host + ' port ' + port);
        var socket = net.connect(port, host, function() {
            socket.end('hello ' + host);
            resolve(socket);
        });
        socket.on('error', reject);
    });
}

console.log('Starting too many servers on port ' + port + '...');
Promise.all(hosts.map(createServer))
    .then(function(servers) {
        console.log('Started ' + servers.length + ' servers');
        return Promise.all(hosts.map(connectClient));
    })
    .catch(function(error) {
        console.error('ERROR:', error);
    });