Go, Go, Godot!
  • 0

Creating a UDP peer-to-peer connection

November 16, 2023

Creating network connections with Godot is simple — as long as you have the other party’s IP address, and there’s no NAT gateway involved. Unfortunately, that’s exactly the problem in most cases. You don’t know the other party’s IP, and these days, just about everyone is behind a combination wifi router/gateway/firewall with NAT.

Conceptually, NAT hole-punching is pretty simple, and this video explains how it’s done with just netcat.

In a nutshell:

  • listen on a particular port (e.g. 50001)
  • nc -u -l 50001
  • echo ‘hello’ | nc -u ipaddr 50001
  • echo ‘hole punch’ | nc -u -p 50001 ipaddr 50002
  • third party exchanges ip addresses

Putting it all together, player A (hosting a game) would require the game to connect to the directory server.

  • The directory server would list the game as something a player can now connect to.
  • player B (client who wants to join) will tell the directory service that it wants to connect, and will send its info
  • The directory server forwards the information to player A (host), player A will then send a packet to player B, and respond to the directory server
  • The directory server will then tell player B to go ahead and connect to player A.
  • Player B should be able to punch through to player A

With Godot, the connections from client to host would use ENetMultiplayerPeer.create_client(), which can specify the local port.

Here’s an older example of a signaling server: https://github.com/Faless/gd-webrtc-signalling/tree/master

gdscriptgodotnetworking
Posted in Godot.
Share
Previousgodot-matcha: Free multiplayer without a server
NextSuper Godot Galaxy Concept

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Related Posts

  • December 2, 2024

    Inventory System v1.18.1 available (and v2 progress update)

    I’m wrapping up development on version 1 of the Inventory System, which is currently at v1.18.1. All core functionality is in place, and it provides many quality-of-life features. The guide covers and walks through most of the code base, and the demo projects show off a lot of use cases. This first version has been …

  • January 15, 2025

    Inventory System 2 Alpha 1 available

    The first alpha of the inventory system v2 is now available. For v2, a lot of refactoring work has been done with a focus on improving the developer experience. As part of that, the naming convention of the addon classes was streamlined and is more consistent now. The GDScript documentation comments have been improved significantly …

  • August 1, 2022

    Godot Engine on the Steam Deck – Developing games on the go?

    Once I found out about the Steam Deck’s Desktop Mode, it got even more interesting. Steam Deck’s Gaming Mode vs Desktop Mode You see, the Steam Deck defaults to an analog of Big Picture mode on PC. It runs full screen in “Steam Deck gaming console” mode. But underneath all that is a Linux system …

  • October 9, 2023

    The Godot Jungle Demo

    It’s not Far Cry, nor Crysis, but it could be. The Realistic Jungle Demo demonstrates that Godot is capable of impressive visuals. If you want to run it yourself, download it from https://wrobot.itch.io/jungledemo. It was announced in this Reddit post. Update: The source code was released (with the commercial assets removed).

    © 2026 GoGoGodot.io. All rights reserved.