Hello, my ER707-M2 is forward facing my ISP and  I need help configuring my ER707 to use port forwarding (Virtual Servers) to allow devices in my 2.5 G LAN port2  to see the IP address of my ISP on 2.5g LAN port1, my services on LAN port 2 require the ability to obtain the public IP address, the error message I get is; The IP address from DDNS domain resolution is not the same as the WAN IP of the device. You need an Internet Public IP address to use Dynamic DNS. If this router is behind NAT, you may need to set up port forwarding on your ISP router. Any and all help regarding this issue is greatly appreciated in advance.