@debruina Once you make the connection, are you getting the same public IP as your network, if so, you are halfway there, I am thinking you have to forward a port on the 605 to access your web...

@Wuch I have a simular setup, I have a router/firewall connected to my cable modem, I have a static route from my firewall with DHCP turned off to my ER605 I have DHCP on the ER605 with 2 different...

@Jeesoon1 If I understand your question the setup was pretty basic before adding the Linux Firewall creating the double nat.

@Jeesoon1 I am running a double nat setup ISP>>LinuxFW>>ER605>>switch>> The Linux firewall (IPFIRE) is doing the NAT from there I have a static route to the ER605's WAN port, that is were the second...

I take it the customers are on the other side of the internet? If so could you create a vpn connection between devices?? If they are in the same network you could you possible create a static route??...

I have a cable modem connected to the WAN port of my IPfire firewall (192.168.10.1) a static route to the wan on the 605 (192.168.10.2) yes it its double nat..currently everything works and all...