Make sure that your internet-modem which connects to the internet (and the netgear router) does not block the incoming requests and forwards to either your netgear router or your database-computer depending on your setup. Please note: that modem might have a different IP address than the one you mentioned. The setup software of your modem should tell you which IP address it uses. That will be the address for your browser at work.
I would expect that if you instruct your modem to forward to the IP address and port combination that FileMaker mentions, you should be able to connect to your database. Although I have also seen combinations where the modem should redirect to the router which then redirects to the database-computer.