Windows network routing

Question

I'm working by my customer premises and they let me connect my private laptop on a dedicated Wi-Fi for internet access. It's nice for external consultants. The only issue is that we can't connect on a remote server on port 25. I suppose this policy is set up to avoid infected computers sending spam from their network.

As you can have guessed, this is something weird that I can't send mail at all. Fortunately, I've a 3G cell phone that I can connect by Bluetooth on my laptop. So when I want to send an e-mail, I have to disconnect from Wi-Fi, connect my phone, send the e-mail, disconnect phone and reconnect Wi-Fi. Kinda overhead.

My question is: how can I tell Windows 7 to use the Wi-Fi for every out connection, but if it's a connection on port 25, use the cell phone network? With this solution, I could let my phone connected all day without having to switch again and again.

Thanks a lot for your anwwers. Fabian

Answer 1

do the below only if you know what you are doing.

• first open an admin right cmd.exe (i.e. windows key -> "cmd" then right click "cmd" and click "run as administrator")
• run route print (this should show the interfaces)
• then run route add dest mask netmask gateway metric metric IF ifcode where dest = destination (the mail server), mask = netmask (in your case is a single IP), gateway is the default gateway of the phone, metric (a small one), and ifcode the interface of your phone.

hope that helps