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If your worried about security you should use a hardware firewall as it gives you better protection, a good qaulity router should have one in built or you can buy them as a device in themselves we use a Watchguard at work and its really good. I use a netgear router at home and it works well for me. If you follow the link and click on the proceed it will give you options to test your ports, what your looking for is that your ports are stealth. that is nice and healthy and means you have nothing open. But the best advice is stay off the dodgy sites as they cn be full of all sorts of nasties. https://www.grc.com/x/ne.dll?bh0bkyd2