[Mesh] coucou

Coucou, TL;DR: Help? After setting a N600 router following the wiki page, I am able to connect my router using WiFi (using the private access point) but I can't ping any device other than the ones connected to my router. I don't know what to do now. Is there any troubleshoot page ? To reproduce: 1. Follow the guide (well written!) 2. Pain Thanks, Keo