This issue has had me up a wall for the last week and I am about to abandon this router.

I have two static ip addresses, I host a website and an libretime server from two boxes

I have IP passthrough set up on my modem, with my dynamic ip powering my home network, and the last two ports as the ip passthrough going to the ER. 

I have i have 1 IP assigned to WAN and the other to WAN1/LAN.

WAN then has a port forward rule to forward 443 to the local machine.

WAN1/LAN also has a port forward rule to forward 443 to the other machine.

I can reach WAN1's website fine, but WAN1/LAN will not port forward for the life of me. The internet will work as far as outgoing but no matter what port i try and forward, it will not work externally.

when I tun a traceroute from a laptop connected to the local network, to the ip address of WAN1/LAN it just hits the router, then to the box. i can access it locally but externally at all.

It will only start working if i unplug WAN.

Any ideas?