I have just installed a Vigor 2925 and am having a basic connection problem.
I hav a LAN2 mapped to port 5 and the only one to use it.
DHCP is on and the gateway is set to 192.168.2.1 and address start at 192.168.2.2 with 255 IP pool count.
A switch plugs into port 5. All devices get ip via DHCP.
My Windows PC is plugged into the switch.
An access point is plugged in to the same switch.
A mobile phone is logged into the access point and I can ping the phone from the pc.
However, I cannot ping the access point nor get into its admin page even though the access point is working as normal on the internet.

What could cause this behaviour?

Are you sure you have the right up address for the AP?