python发送伪造的arp请求

代码如下:
#!/usr/bin/env python
import socket

s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
s.bind(("lo", 0))

src_addr = "/x50/x3d/xe5/x0e/x35/x3f"
dst_addr = "/xff/xff/xff/xff/xff/xff"
ethertype = "/x08/x06"

s.send(dst_addr+src_addr+ethertype+"/x00/x01"+"/x08/x00"+"/x06"+"/x04"+"/x00/x01"+src_addr+"/x7f/x00/x00/x01"+"/x00/x00/x00/x00/x00/x00"+"/x7f/x00/x00/x01")