I am a student in the U and is thinking of writing a simple firewall program. There are some questions that I am not sure if it is feasible..so if any can give me some ideas would appreciate it.
1. I want to write a firewall at the AHDLC (Asyn High Level Data Link Control Layer). Is it possible?
2. Can Java be used?
My reason in putting the firewall at that layer is to screen out the packets before going up the TCP/IP layer.
I am new at network and this would be my thesis project, so if any one can give me some ideas... would appreciate it. If it is not possible, then I would choose another topic to work on.
The network stack is a series of layers, you can squeeze your own layers in there thus i dont see a problem why you couldnt squeeze your firewall in there too. I've personally not done anything like that (yet) but i can tell you one thing. You can do the firewall in java, as a client of course. The kernel driver must be in a solid, compiled language - java is more of an interpreter than an actual fudge of native mechine code.
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