I have an AP800 running in AP mode which does not seem to be bridging WiFi clients connected to it to the LAN. The main router is a BT Home Hub 3 and this configuration was previously working.

If I connect using a cable via the hub on the AP 800 then things work correctly.

If a device connects to the WiFi then while it shows as an active station on the AP800 it does not then seem to forward traffic to the network.

Devices connecting to the WiFi on the AP 800 are allocated an IP address and DNS server info but cannot be pinged from the physical part of the network.

Any suggestions would be appreciated.

Can not ping the default 192.168.1.2 or any other ip if you have changed of the AP?
Check the dhcp LAN >> General Setup
Also maybe something with the encryption key when is been set up the AP 80 or the mode b+g+n

On the AP800 the settings are as follows:

Operation Mode - AP

Enable AP management
General setup - Disable DHCP
Wireless LAN
2.4 Ghz
Enable LAN
Mixed mode B+G+N
match the SSID of the main router
Channel 11
Extension 7
Burst mode off
Antenna 2T2R
TX power 100%
Security
SSID 1
Mode mixed
Algorithm TKIP/AES
WPA password present
Access Control
Disable
WPS
Disable
AP discover
Disable

Looks ok ... i would say to use latest firmware 1.1.5, seems have fix for some dhcp, burn in problem etc
If you have the latest already master reset & try again
It may good idea as well to check the NIC of the devices

I have to admit that what I am doing should not be too complicated and I think that the router (a BT Home Hub) may be the culprit. That is being replaced so fingers crossed.