parser.add_option("-l", "--url", dest="pl_url", help="PlanetLab XMLRPC url", default=pl_url)
parser.add_option("-b", "--base", dest="basenet", help="Base network address to perform assignment (defaults to 10.0.0.0/8)", default="10.0.0.0/8")
parser.add_option("-n", "--prefix", dest="prefix", help="Network prefix for segments (defaults to 21)", default = "21")
parser.add_option("-l", "--url", dest="pl_url", help="PlanetLab XMLRPC url", default=pl_url)
parser.add_option("-b", "--base", dest="basenet", help="Base network address to perform assignment (defaults to 10.0.0.0/8)", default="10.0.0.0/8")
parser.add_option("-n", "--prefix", dest="prefix", help="Network prefix for segments (defaults to 21)", default = "21")