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No you don't need multiple nics, I just suggested it as being an easy answer.
Any way you go about it, you're going to need to get more ip's from your service provider. Some come with multiple IPs, some charge extra. If you're using more than 3 ips in total, and paying for the extra two, look in to a business plan it may be cheaper.
After you have additional IP's, you can bind your existing network card. This is more difficult then popping in a $10 plug-and-play network card and connecting it to your switch.
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