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What is the best way to accomplish a firewall application?

Last Modified: 2012-05-10

I am intending to complete a firewall appliaction project.

I have completed the Network monitor library which retreive all reuired information from data packet on the Layer 2.

According to my plan, I do need to start the second phase which focus on:

1- VPN connection
2- Drop, allow and deny packets
3- Drop, allow and Deny applications and attachments such as pop3 and smtp service.  
4- All types filtering and parsing(content filtering)

So please, I do need a good refernce to assist in completing my project such as:

What is the best language?
Is there any Dll library that could be accomodated to accomplish my project such as wincap.
I do need some applications with source code(preferable VB.net)

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