I'm using my Windows XP laptop with Option iCON 225 (mobile USB modem). Is
there a way to change the NAT settings in Windows XP from Moderate NAT to
Open NAT as recommended for Xbox Live connection?

Hi
X-BOX is a game console so if it is on Open NAT it is not so dangerous.
Putting a computer on Open NAT means exposing it with all the port opened to
the Internet.
A very Big security No No.
Jack (MS, MVP-Networking)

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Thanks for the warning about Open NAT in Windows.

You would be advised to buy a combo modem/Ethernet router and ditch the USB
modem. This will allow you to connect the computer and xbox simultaneously,
and there will be no need to reduce the computer's security.

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Option iCON 225 is a 3G modem, so I have to use it for my 3G connection.
Anyway, instead of using my Windows laptop as a router, I have ordered a
Dovado USB Mobile Broadband Router, so I can connect Option iCON 225 in
that machine.

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