def __init__(self, ip=None, mac=None):
super(Host, self).__init__(n_tips=1)
self.tip = self.tips[0]
if mac is None:
mac = self.index + 1
if ip is None:
ip = '1.0.0.{}'.format(self.index + 1)
# physical layer - frame delimiter
self.delimiter = BitDelimiter(self.tip)
# link layer - flow control
self.framer = Framer(self.delimiter, mac_to_bytes(mac))
# network layer - ARP
self.packeter = Packeter(self.framer, ip_from_str(ip))
