Help!!! - how to check a request on a socket(or a packet) ?

how can i possibly check request on an incoming socket(or a packet) ?
[how can i ckeck if i asked a partiqulare socket(or a packet) to be recieved from a specific IP?]

I know what you're asking now. You can't unless you pipe all of your incoming connections THROUGH your java program. There is NO way to write a pure java application that just spies on what ports are open on your system, and where they are connected. No matter what you do, you have to either rewrite the networking of the OS or find a way to communicate with it, either way you're gonna need JNI or just straight C/C++. Posted the question over and over again is not going to get you a better answer.

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