def recv(self, data) :
header = PacketBuilder.parse(data[0:self._header_struct.sizeof()])
data = data[self._header_struct.sizeof():]
data = data[:-self._trailer_struct.sizeof()]
internet_layer = NetworkLayer.from_int(header.internet_proto)
internet_layer.recv(self._mac_to_ip(header.source_mac), data)
