1) constant field marks
常量字段标志
2) Flag field
标志字段
1.
The data packet with special flag field was sent to the port of target host by 6-bit Flag field in TCP head, and the contents of 6-bit flag field of the response package from the target host was analyzed to get the status of port of target host.
利用TCP头部6个1位标志字段,向目标主机端口发送带特殊标志字段的数据包,分析目标主机响应数据包TCP头部的6个1位标志字段的内容,得目标主机的端口状态。
3) end-of-field-mark
字段结束标志
5) variable field mark
变量字段标记
6) segment attribute
区段标志