Ip 报头的第 1 个字节(0x45:0100 0101):
4:Version 版本号
5:Header Length 报头长度(32 位 ): 5*32 位/8=20 字节
Version:
Identifies the version of IP used to generate the datagram.For IPv4, this is of course the
number 4. The purpose of this field is to ensure compatibility between devices that may be
running different versions of IP. In general, a device running an older version of IP will reject
datagrams created by newer implementations, under the assumption that the older version
may not be able to interpret the newer datagram correctly.
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