I have just bought the above, and with to use it so I can connect a PC to it via Ethernet connected to my Wireless network upstairs. I would run cables, but we rent, so not a option

I have read the manual ans trolled the net for most of the night, and cannot get it to work

Have followed many instructions and multiple configurations, but nothing seems to give me internet access

Wireless router DHCP set from 192.168.1.5 to 192.168.1.199, so no IP conflict

Its setup like this at present (and not working)
IP of WA901ND - Static on 192.168.1.254
Gateway 192.168.1.1
DHCP OFF (so router upstairs does the DHCP)

It is connected to the wireless router and I have entered the passphrase as needed (I can see it on the wireless DHCP client list, so I assume its connected)
I can ping the wireless router on 192.168.1.1 OK

I can only connect to the WA901 if I set the PC to a manual IP setting, DHCP won't give me a connection

Anyone, please, any ideas
If you're in the Churton Park area, I'll even pay you!