Much of the IP data is not useful, beyond the protocol and source/destination address information.
其中除了协议和来源/目标地址信息，其余许多IP数据是没有用的。
The number of bytes reserved for the remote address information. This value must be at least 16 bytes more than the maximum address length for the transport protocol in use. Cannot be zero.
“要比系统给的最大地址长度至少要多16个字节”，而我的代码没有多这16个字节，问题就出在这里，修改一下，再运行，就没问题了；
The number of bytes reserved for the remote address information. This value must be at least 16 bytes more than the maximum address length for the transport protocol in use. Cannot be zero.
“要比系统给的最大地址长度至少要多16个字节”，而我的代码没有多这16个字节，问题就出在这里，修改一下，再运行，就没问题了；
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