When internal devices communicate with the Internet, the router needs to sort a lot of data packets so that the requested web content is sent to the right device. Now, here's where the NAT firewall comes into play: How NAT makes communication between your device and the Internet possible. Also, NAT helps solve the fundamental issue with IPv4 addresses - their shortage. Basically, your router acts as a middleman between devices on your local network and the Internet, and all internal IP addresses remain hidden when you go online. NAT ( Network Address Translation) - This is how devices with internal IP addresses communicate with the Internet through one single external IP address (your router).Only devices on your local network can see internal IP addresses, and they're basically invisible to external devices on the Internet. In turn, the router assigns each device on your local network an internal IP address. Internal/External IP Addresses - Your ISP assigns your router an external IP address, which lets it communicate with the Internet. To fully understand it, we first need to let you know about two things: Here's a simple image to help you visualize what firewalls are:įirewalls in action. If it notices any suspicious traffic (like data packets you didn't request), it will discard it. To keep things simple, just think of it as a layer of protection on a network.Īny data that leaves the network or gets sent to the network has to pass through the firewall. What Is a Firewall?įirst, we need to take a look at what a firewall is. And if not, you can always send us your questions or ideas, and we'll add them to this article. Who knows, maybe you'll find out some new things. We'll go over this topic in-depth in this article, and we'll also try to make it as easy to understand as possible.Įven if you know what NAT firewalls are, give this article a quick scan, at least. It sounds cool, we'll give you that, but do you actually know what it is and why it's important? "NAT firewall" is the kind of word you see paraded in marketing copy by VPN providers and highlighted as a must-have feature on VPN review sites.
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