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Mohammad Saad avatar Server

Port forwarding on a FortiGate firewall sitting behind an ISP router

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Mohammad Saad

I have a FortiGate firewall (30E) which is sitting behind a router (provided by ISP). The router has allocated local IP to the firewall and from this firewall subnet is created on which the server is running. enter image description here

Router -> Global IP
Firewall -> 172.135.0.2 (Gateway address)
Server -> 10.0.0.3

Goal: I would like to expose an application (hosted on server's localhost) to the external internet.

To achieve this, I have tried creating virtual IP and IPv4 policy to forward the local port.

For example:

application is running on `10.0.0.3:8080/app`
port forwd (virutal ip): `172.135.0.2 --> 10.0.0.3 (8080 --> 8080)`

Following this, I exposed the port 8080 on the router:

port forwd (router) : 172.135.0.2:8080

So i used the gateway address of firewall as the application IP address and open it as HTTP service on my router. However, i still cannot access application from outside.

May I ask, how to expose this application. Please, suggest advice or ideas to make this work. Thanks look forward to all the responses. I have So my router is allocating local IP address to the firewall.

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