dev_pypacker.py 文件源码

def set_os_mtu(self, iface=None, mtu=None):
        """Set MTU value in host OS.

        Args:
            iface(str):  Interface for changing MTU in host OS
            mtu(int):  New MTU value

        Returns:
            int:  Original MTU value

        Examples::

            env.tg[1].set_os_mtu(iface=ports[('tg1', 'sw1')][1], mtu=1650)

        """
        try:
            soc = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
            ioctl(soc, self.SIOCSIFMTU, struct.pack('16sH', iface.encode("utf-8"), mtu) + b'\x00' * self.ETHER_HEADER)
        except Exception as err:
            raise PypackerException("ERROR: Setting MTU failed: {}".format(err))