This guide purpose, is to explain and show how to configure a Debian distribution to serve as a router, fully replacing a Livebox from Orange (ISP).

All those steps have only been tested on Debian 12.

You might need to adapt on other distribution or version.

Special thanks to lama for the help on Debian configuration and rss for his beautiful mod on the XGS-ONU-25-20NI ONU from fs.com