VPN Appliance behind home network

[pfalls]

I've been racking my brain and reading everything I can find but I can't figure this out. I would like to setup a Cisco RV180 on my home network to act as a VPN connector to my work network. I can use Windows to connect a PPTP VPN from my computer fine. but I need a couple devices to connect to my work network so I thought I would put them behind a VPN appliance to get them connected. I have a great JPG showing what I want to do but I can't attach it to this post.

At work I have a FortiGate 200B firewall setup with IPSEC Phase1 and Phase2. I want to configure the RV180 to connect to that tunnel and route traffic between my two devices and my work network. I've set everything up on both of them according to different tutorials I've found but still no joy.

Does anyone have any experience with this kind of setup? If you'd like to see the diagram, click HERE.

Any help you guys can give is greatly appreciated. I'm beginning to go bald from all the pulling of hair.

 

[choucove]

One thing that could possibly be causing some issues is normally a VPN gateway needs to be just that, the gateway to your home network. In most cases your home network is going to have a modem or gateway from the internet provider which is doing the endpoint connection back to your ISP (commonly PPPoE.) I've known many firewalls and VPNs that would not work properly unless they were the outside connection and didn't have a modem in the way of the connection. This means you may need to set up your modem in bridged mode and set your VPN gateway as the outside ISP connection.