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Q: I use Steve Gibson's ShieldsUP! Web site (www.grc.com) to test for Internet visibility and always find I am in complete "stealth mode" on all ports, just using cheap Linksys routers (running NAT connected to our cable modems. I get a dynamic address from Comcast, perhaps improving my security). What types of added protection do you get from a firewall that you don't get from NAT? It is my impression — perhaps naive — that with NAT if the packet does not originate from your local intranet to the outside Internet, that it is not possible for a packet to be sent to you unsolicited. Is that wrong?
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