Well, indeed, it requires you to turn your computer into a router (or somehow grab a network dump directly from your existing router), how else is the computer supposed to receive data the router only sends to the Wii, and data the Wii only sends to the router?

There is a tutorial for that here as well: forum.wii-homebrew.com/index.p…setup-mkw-ana-on-windows/

1. En gros, notre ordinateur doit être pirate?
   

I don't understand what you mean by that - translated to english that says "Basically, our computer must be a hacker?".

It doesn't need to be a "hacker", whatever you mean by that. It just needs a way to read the data the Wii sends and receives to/from the Internet.

MKW-Ana requires you to be able to read the data between Wii<->Router. Usually, this means doing one of these:
- Making your PC the router for your Wii.
- Setting up a static route so all traffic goes via your PC (Similar to first)
- Run a packet dumper on your router that your PC can read from (OpenWRT routers can do this, it's what I do :P)

Using a Nintendo Wi-Fi USB Connector works, too.

Another way I can think of getting it to work is to use hostednetwork method which requires you to have a wireless network adapter that supports it however I couldn't get it to work with my Wii U which for some odd reason running the Wii U in vWii mode doesn't seem to send any packets at all to the computer.