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firewall building approach?

  Asked By: Bakir    Date: Jul 15    Category: Java    Views: 5437
  

I want to make a java based, simple placket filtering firewall on windows
plateform. I have to interfere with operating system some where in network /
transport layer. Now the question is, does java provide the ability to
reject/select packet based on its header type?? That is, the program should read
a packet from already estabslished connection (not forming a new
connection/socket of its own) and then based on incomminng packet's header
content,either allow the operating system to process the packet to application
level or to reject it alltogether.
I would be gratefull if u can provide me the methodology at the earliest.

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