Can i capture a network package and modify it?or drop it like firewall?

how can i do that?
jnetcap? or some others?

Jnetcap and the various versions of Jpcap are all based on libpcap which doesn't have any facility for dropping packets. I'm not aware of any way of doing that in Java short of writing an operating-system-specific protocol stack driver in a native language and using Java+JNI to communicate with it.
You're much better off investigating the existing firewall products and freebies than trying to shoehorn Java into this.

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