目录利用ICMP协议探测内网IP利用ARP协议探测内网IP利用TCP协议探测端口地址信息在IP层, 可以利用 ICMP 或 ARP 协议数据包探测IP信息.ICMP协议可以利用ping工具发送数据包, 但是防火墙有可能禁止ICMP, 无法有效探测,
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