How to set up WAN. (help please. DHCP ERROR)

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@WayOutWest

Have tried this but the Apple Airport Express is not even assigning an IP address to the Turris. Tried using both the WAN port and LAN1 port connected to an unused port on my network switch. After connecting the Turris, arp -a shows that there is no IP address being allocated by the Apple router to the Turris so it would appear that the Turris still cannot even talk to the local network

Could it be that you were also hit by this bug:

Swich ports offline if plugged during boot

There is a fix coming for that but in the meantime adminX has a good workaround.