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.