Firewalls - how do they work?

This is a discussion on Firewalls - how do they work? within the Networking/Device Communication forums, part of the General Programming Boards category; As I am in incredibly smart person, I found myself wondering about firewalls. And I said to myself, the only ...

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    Banned nickname_changed's Avatar
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    Firewalls - how do they work?

    As I am in incredibly smart person, I found myself wondering about firewalls. And I said to myself, the only thing they really seem to do is block all connections to ports (maybe only the first 1024 anyway). So I wondered, could I make a program that binds to all those ports in the same way, and only 'opens' (doesnt bind to) the ports I specify to be open? If I did that, would it be considered a firewall? I'd like any suggestions and comments on this matter, I'm about to download a free one now and see if thats all it does, and if it is I'll make my own program to do it

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    End Of Line Hammer's Avatar
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    Its more complicated than that, but I guess you already knew that really.

    http://www.howstuffworks.com/firewall.htm
    http://www.google.com/search?hl=en&l...=Google+Search
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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    Yeah, I figured there was more to them, such as monitoring internet applications, filtering for content etc, but I was wondering about just the basic concepts. Thanks for the links Hammer, I'll read them now

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