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A router will add some protection too. Why not make it a a router/firewall in the same box.
NAT will take your public IP and using NAT provide you all the IPs you could want. Plus those IPs are not routable on the net. Therefore you have some protection.
We could write a short book. Go to the Netgear site to learn about them or do a google search on Network Address Trranslation (NAT) and routers.
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