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| NAT as a firewall |
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| Written by cecco | |
| Tuesday, 22 January 2008 | |
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Network Address Translation was built to conserve the total amount of IP addresses needed over the Internet. With NAT you can set up an internal network which has got as many computers as you want and each of them has assigned an internal IP address. This IP is reachable only from inside network unless you set up port forwarding on NAT device. NAT could also be used as a firewall because it restricts incoming traffic and hide the details of your internal network. In fact, every hosts in your networks are hidden at outside world, so a hacker from the external network is only be able to see the IP address of your NAT device, not your host’s ones. NAT has got a huge set of disadvantages, as well. If your PC is behind NAT it can’t act as an hosting service for the outside world because it is reachable only from inside. Also, imagine that you want to build a direct chat application between you and a friend of yours, both behind NAT. Then it is impossible to establish a direct connection because on the server side the socket (IP:Port) opened to listen will be unreachable from the client side. Finally another big disadvantage is that if you want auditing with NAT you must set up a NAT server with logging capabilities. |
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| Last Updated ( Saturday, 26 January 2008 ) |
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