I've solved the problem. To connect a LAN port on the TP-Link Archer D7 to the WAN port of the Fast 5355 you need to use a crossover cable because there is no auto correction.

flying snow wrote Hi, that's the settings on the Fast 5355, you can connect a computer to the WAN port of the Fast 5355 directly , make sure you can get internet access on the computer. Then connect...

Hi, thank you for your prompt reply. Yes, the Fast 5355 is connected to the ISP with telephone line and does have internet access. I have now disabled the DHCP service on the D7 as per your...

Model : Archer D7 Hardware Version : v1 00000001 Firmware Version : 1.6.0 0.9.1 v002d.0 Build 160216 Rel.57110n ISP : Telstra Telstra NBN Optical Fibre to the Node VDSL Telstra supplied sagecom Fast...