Node.js socket.setTTL() Method
The socket.setTTL() method is an inbuilt application programming interface of class Socket within dgram module which is used to set or clear the IP_TTL socket option which helps to specify how many number of IP hops that a packet is allowed to travel through the specified router or gateway.
Syntax:
const socket.setTTL( ttl )
Parameters: This method takes integer value representing the number of IP hops that a packet is allowed to travel through the specified router or gateway.
Return Value: This method does not return any value.
Example 1: Filename: index.js
Javascript
// Node.js program to demonstrate the// server.setTTL() method// Importing dgram modulevar dgram = require('dgram');// Creating and initializing client// and server socketvar client = dgram.createSocket("udp4");var server = dgram.createSocket("udp4");let broadcast_address = 12345;// Catching the message eventserver.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_TTL socket option // and specifying the number of IP hopes // by using the setTTL() method server.setTTL(144);});// Client sending message to serverclient.send("Hello", 0, 7, broadcast_address, "localhost"); |
Output:
UDP String: Hello
Example 2: Filename: index.js
Javascript
// Node.js program to demonstrate the// server.setTTL() method// Importing dgram modulevar dgram = require('dgram');// Creating and initializing client// and server socketvar client = dgram.createSocket("udp4");var server = dgram.createSocket("udp4");// Catching the message eventserver.on("message", function (msg) { // Displaying the client message process.stdout.write("UDP String: " + msg + "\n"); // Exiting process process.exit();});// Catching the listening eventserver.on('listening', () => { const address = server.address(); console.log(`server listening ${address.address}:${address.port}`);});// Binding server with port addressserver.bind(1234, () => { // Enable the IP_TTL socket option // and specifying the number of IP hopes // by using the setTTL() method server.setTTL(144);});// Client sending message to serverclient.send("Hello", 0, 7, 1234, "localhost"); |
Output:
server listening 0.0.0.0:1234 UDP String: Hello
Run the index.js file using the following command:
node index.js
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_setttl_ttl
