Searching for free networking tutorial

Hi all! i’m starting a new project based on online multiplayer and i’m searching for a free tutorial to learn how to do it. Any suggestion?

Hi Valerik,
First I’d like to point out that your question is as generic as “I want to make a game, where can I find a tutorial?”.

But, generically speaking, the first thing to do would be go to http://unity3d.com/unity/engine/networking and read the whole stuff.
Than you should define the type of communication that game will require (P2P, master server, etc) and look after the specific type of multiplayer for your needs. Also, if you’re going to use a server framework, some may not be available for some platforms, and each one may use a different programming language.

First do yourself a service and read Unity’s multiplayer/network documentation.
Next you can check out the tutorial from unity, a little dated but still gets it done.