可输入需要捕获的IP数据包数量，输出每个IP数据包的相关字段值（包括版本、总长度、标志位、片偏移、协议、源地址与目的地址等）-We need to capture the number of IP packets can be input and output of each IP packet field values ​ ​ (including the version, the total length of the flag, on-chip offset, prot