@Kevin_Z Thanks, yes had checked DHCP was off, it seems to be a fault with the WDR 4300, will change the software to open source and check again. Meantime built a bridge using a spare raspberry Pi,...

I have a small home Wired Lan and wish to bridge this with a WDR4300 to my BT SmartHub. I have set up the bridge as instructed WDS, select BT Hub from survey, DHCP off BT Hub Gateway 192.168.1.254...