Traceroute

A simple command-line tracert implementation in Python 3 using ICMP packets

Details

Traceroute is a networking tool designed for tracing the movement of packets across a network. In this Python 3 implementation, ICMP 'ping' packets are used, much like the Windows tracert.exe program (and unlike Unix tracert which typically uses UDP packets).

The application sends a sequence of ICMP packets to the host, initially with the Time-To-Live field set to 1. As the packet travels across the network to its final destination, each node it passes through will decrement the TTL field by 1. When the field reaches zero the node will respond by saying that the packet could not reach its destination.

+------+           +--------+
|      |  TTL = 1  |        |
|      | --------> |        |
| HOST |           | node 1 |
|      |  timeout  |        |
|      | <-------- |        |
+------+           +--------+

Having now identified the first node that the packet passes through, tracert now sends another ICMP packet with TTL set to 2, which will timeout when it reaches the second node, and so on.

+------+           +--------+           +--------+
|      |  TTL = 2  |        |  TTL = 1  |        |
|      | --------> |        | --------> |        |
| HOST |           | node 1 |           | node 2 |
|      |  timeout  |        |  timeout  |        |
|      | <-------- |        | <-------- |        |
+------+           +--------+           +--------+


+------+           +--------+           +--------+           +--------+
|      |  TTL = 3  |        |  TTL = 2  |        |  TTL = 1  |        |
|      | --------> |        | --------> |        | --------> |        |
| HOST |           | node 1 |           | node 2 |           | node 3 |
|      |  timeout  |        |  timeout  |        |  timeout  |        |
|      | <-------- |        | <-------- |        | <-------- |        |
+------+           +--------+           +--------+           +--------+

Eventually, an ICMP packet will be sent with a sufficiently large TTL value that it can reach the final destination, at which point the process is complete.

+------+           +--------+           +--------+           +--------+           +--------+
|      |  TTL = 4  |        |  TTL = 3  |        |  TTL = 2  |        |  TTL = 1  |        |
|      | --------> |        | --------> |        | --------> |        | --------> |        |
| HOST |           | node 1 |           | node 2 |           | node 3 |           | TARGET |
|      |  success  |        |  success  |        |  success  |        |  success  |        |
|      | <-------- |        | <-------- |        | <-------- |        | <-------- |        |
+------+           +--------+           +--------+           +--------+           +--------+

A simple command-line tracert implementation in Python 3 using ICMP packets

Related tags

Overview

Traceroute

Details

Owner

James

Convert shellcode into :sparkles: different :sparkles: formats!

Command line interface for testing internet bandwidth using speedtest.net

Pastekan adalah website paste kode / teks sederhana

Python3 parser for Apple's crash reports

A mini command line tool to spellcheck text files using tadqeek.alsharekh.org

A minimal todo list for your terminal.

A terminal UI dashboard to monitor requests for code review across Github and Gitlab repositories.

Enriches Click with option groups, constraints, command aliases, help sections for subcommands, themes for --help and other stuff.

A simple reverse shell in python

CLI tool to develop StarkNet projects written in Cairo

Shellcode runner to execute malicious payload and bypass AV

Linux commands Interpreter for Windows and Mac based systems using Python

A command line tool to remove background from video and image

Un module simple pour demander l'accord de l'utilisateur dans une CLI.

A CLI tool that scans through a directory and organizes all loose files into folders by file type.

Ntfy - 🖥️📱🔔 A utility for sending notifications, on demand and when commands finish.

Baseline is a cross-platform library and command-line utility that creates file-oriented baselines of your systems.

Voidlx is a terminal cli apps launcher made in python

Random scripts and other bits for interacting with the SpaceX Starlink user terminal hardware

Notion-cli-list-manager - A simple command-line tool for managing Notion databases