I work at a company which uses a Fortigate 60 router, something I'm not really familiar with. Everything worked fine with it until a week ago when Comcast came in and replaced our modem.

It seemed as though the process went smoothly - our connection came back up and our static IP remained the same.

However, none of our port forwarding is working.

What has me confused is the Comcast modem apparently has two IP addresses. The WAN2 interface for it in the Fortigate router is set to 10.1.10.10. However, all of our port forwarding settings are set to an external IP address of 10.1.10.50.

Now this setup used to work fine, so something with the Comcast modem must have changed. How can I find out what?

I tried setting a computer to a local IP of 10.1.10.15 so I could open up the web interface for the modem, but I can't even ping 10.1.10.10 when I do that.

Any ideas? Thanks!