title: Writing a Personal Firewall in Java that drop network packet
body: <p>I would like to write a Personal Firewall on Java that can drop network packet. Is it possible?</p>
  
  <p>I want to capture a packet on jpcap, but how can i do drop packet? Is there a library in this event on java?</p>
  
  <p>And sorry for my bad English.</p>