Making Firewall

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Hi, How can I write a firewall that controls traffics? My mean is how my firewall can undrestands that a packet recieved from an IP. I think I must use device drivers. Is it true?:confused:

(I want to know how software firewall detects and recieves packets as the first app in windows(for example) and after analyzing sets them free for other app use?)

Posted 5-Feb-10 7:00am

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Updated 6-Feb-10 0:23am

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alex turner · Accepted Answer · 2010-02-06T01:24:00

You are correct that most firewalls use a driver which intercepts the packets. This is an enormously complex and tricky thing to try and do. If all you want to do is analyse packets rather than firewall them - you could try something like windump. http://www.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/packet-capture/winpcap/windump/[^]