Wifi connected devices could not be accessed sometimes from other LAN devices on #Asus
(this post is to help people with same problem)
I have read many and many posts explaining which could cause this problem but nothing reestablishing connection in my case.
All my devices are connected on this router (192.168.2.x), and the router is connected to internet with my ISP box by DHCP (Orange Livebox / 192.168.1.x)
My Wifi printer and a small local media server are connected to LAN through Wifi. When I reboot the router, I can access them (print on printer and ssh on server) during several minutes and then not at all. There is something strange : a NAT redirection to the media server permit to access to it from internet, even when it is not reachable on LAN ???
In fact, I've made a mistake when configuring my LAN : I have specified 192.168.1.1 (ISP box address) as default gateway ! So all device can access to internet, because they use this route to pass through ISP box, but there is a mess for exchange between LAN devices (and only for Wifi connected devices, I don't kwow why in fact)
To solve the problem, I've just removed default gateway address on router DHCP LAN settings and, now, it works perfectly !