title: Sending a request for a specific ip from the dhcp
body: <p>I want to send through Scapy discover request of certain ip address (lets say 10.0.0.30 , ( if there is such a possibility also cause the DHCP server to treat it as fixed after he give me the ip its even better )
  how do I do it ?
  How can I get a certain IP ?
  (Of course all of the above applies on ip that right now not occupied by any client in the server (free ip right now , but no ip that never used) )</p>