compared to Geoff's config mine is probably a little more complex.
i have 2 VLANs configured (1 for main network, 1 for guest WIFI, which has total device isolation), OpenVPN configured, eth4 has PoE passthru enabled to power by Unifi AP. - in fact i have the ER-X powered via a POE injector. i also have DynDNS enabled so that if my WAN IP were ever to change it will update my host with the new IP (i have a webserver on my local LAN).
With the same hardware how did you manage to get the erx to connect to the sh3 in modem only mode. I have tried and when setting erx to wan dhcp it world not pick up the external ip address.
My old ASUS router picked up the external ip address with no issues but with that hardware I didn’t have to defined an input type for the wan.
i can get the erx to work but only if the sh3 is also working as a router and passing an internal ip address to the erx. Having two routers is not what I want and as the ASUS WiFi Router accomplished what I wanted out of the box the erx should also be able to do it.
Thank you for the suggestion. In the end I left the super hub off for 10 mins after switching it to modem only mode and when I reconnected the erx it managed to obtain an external IP address. Thanks for your help it was much appreciated. Now I have 1 router as I wanted. Thank you