sudo iptables -I INPUT -p tcp –dport 9000 -j DROP

def x(p):
  p.src='00:1C:23:1E:4E:5A'
  p.dst='00:03:25:19:7C:B8'
  p.payload.src='10.0.0.20'
  p.payload.dst='10.0.0.17'
  p.payload.chksum=None
  p.payload.payload.chksum=None
  sendp(p.build())

sniff(filter='tcp and src 0.0.0.0',prn=x)

def x(p):
  p.src='00:1C:23:1E:4E:5A'
  p.dst='00:18:84:17:C2:98'
  p.payload.dst='10.0.0.88'
  p.payload.src='10.0.0.20'
  p.payload.chksum=None
  p.payload.payload.chksum=None
  sendp(p)

sniff(filter='tcp and src 10.0.0.17',prn=x)