old_contents: #!/usr/bin/env python
  
  import socket
  import sys
  
  # Create a UDP/IP socket
  sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  
  # Bind the socket to the port
  server_address = ('localhost', 10000)
  print >>sys.stderr, 'starting up on %s port %s' % server_address
  sock.bind(server_address)
  
  while True:
      print >>sys.stderr, '\nwaiting to receive message'
      data, address = sock.recvfrom(4096)
      
      print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
      print >>sys.stderr, data
  
      responselines = data.splitlines()
      src_ip = responselines[1]
      udp_ip = address[0]
  
      if src_ip is udp_ip:
          print "udp src IP %s matches packet contents ip %s" % (udp_ip, src_ip)
      else:
          print "udp src IP %s DOES NOT MATCH packet contents ip %s" % (udp_ip, src_ip)
      
  #    if data:
  #        sent = sock.sendto(data, address)
  #        print >>sys.stderr, 'sent %s bytes back to %s' % (sent, address)
  
new_contents: #!/usr/bin/env python
  
  import socket
  import sys
  
  # Create a UDP/IP socket
  sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  
  # Bind the socket to the port
  server_address = ('0.0.0.0', 10000)
  print >>sys.stderr, 'starting up on %s port %s' % server_address
  sock.bind(server_address)
  
  while True:
      print >>sys.stderr, '\nwaiting to receive message'
      data, address = sock.recvfrom(4096)
      
      print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
      print >>sys.stderr, data
  
      responselines = data.splitlines()
      src_ip = responselines[1]
      udp_ip = address[0]
  
      if src_ip is udp_ip:
          print "udp src IP %s matches packet contents ip %s" % (udp_ip, src_ip)
      else:
          print "udp src IP %s DOES NOT MATCH packet contents ip %s" % (udp_ip, src_ip)
      
  #    if data:
  #        sent = sock.sendto(data, address)
  #        print >>sys.stderr, 'sent %s bytes back to %s' % (sent, address)
  
subject: change server address to 0.0.0.0