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I always fear the moment when technical terms move beyond the technical people and start to find use in the nontechnical world The moment any technical term becomes part of the common vernacular, you can bet that its true meaning will become obscured, because without a technical background people are reduced to simplistic descriptions of what is invariably a far more complex idea I submit the term firewall as a perfect example of this phenomenon Most people with some level of computer knowledge think of a firewall as some sort of thingamabob that protects an internal network from unauthorized access to and from the Internet at large That type of definition might work for your VP as you explain why you need to get a firewall, but as techs, we need a deeper understanding Firewalls protect networks from external threats potential attacks from outside your network by using a number of methods, such as hiding IP addresses using NAT, selectively blocking TCP/UDP ports, or even filtering traffic based on MAC addresses From there, things get much more complex, so for now let s define a firewall as a device that filters IP traffic to protect networks and computers But a firewall doesn t have to be a dedicated device There are two very different places where you might run into a firewall The first place is a device at the edge of your network Given that there s already a router at the edge of your network, you d be hard pressed to find a router today that does not also act as a firewall Since the firewall is in a box on the network, we
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call these network-based firewalls (also called hardware firewalls) The second place is software installed on your computer that does the same job, but only firewalls packets coming in and out of your system We call these host-based firewalls (also called software firewalls) In a perfect world, your network has a network-based firewall at the edge of your network and all of your systems run a host-based firewall
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The first and most common technique for protecting a network is to hide the real IP addresses of the internal network systems from the Internet If a hacker gets a real IP address, he can then begin to probe that system, looking for vulnerabilities If you can prevent a hacker from getting an IP address to probe, you ve stopped most hacking techniques cold You already know how to hide IP addresses using Network Address Translation (NAT) That s why most routers have built-in NAT capability Not only does NAT reduce the need for true IANA-supplied public IP addresses, but it also does a great job protecting networks from hackers, because it is difficult to access a network using private IP addresses hidden behind a NAT-enabled router NOTE Many sources challenge the idea that NAT is a firewall feature Granted, NAT wasn t originally designed to act as a firewall, but it sure does protect your network
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The second most common firewall tool is port filtering, also called port blocking Hackers often try less commonly used port numbers to get into a network Port filtering simply means preventing the passage of any TCP or UDP packets through any ports other than the ones prescribed by the system administrator Port filtering is effective, but it requires some serious configuration to work properly The question is always, Which ports do I allow into the network When you open your browser and access a Web page, your Web browser sends out packets to the Web server with the destination port of 80 Web servers require this and it s how TCP/IP works No one has problems with the well-known ports like 80 (HTTP), 20/21 (FTP), 25 (SMTP), and 110 (POP3), but there are a large number of lesser-known ports that networks often want opened I recently installed port filtering on my personal firewall and everything worked great until I decided to play the popular game World of Warcraft on the Internet (Note to WoW nerds: Blackwater Raiders server, I m Pelape or Pelope ) I simply could not connect to the Internet servers, until I discovered that World of Warcraft requires TCP port 3724 open to work over the Internet After reconfiguring my port filter (I reopened port 3724) I was able to play WoW, but when I tried to help one
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