摘要
IP协议为提高数据传输效率,简化了协议,舍弃了许多为提供可靠性所需要的工作（如建立连接、维护连接、拆除连接、确认应答、时间片处理等）。其唯一的正确性检验即依靠头部校验和,以保证头部数据的完整性。为了研究IP首部校验算法,查看了相关的RFC文档并利用wireshark工具进行了抓包,并对抓包取得的数据进行了计算验证。研究发现了一些算法存在一定的问题并对它的改进算法进行了研究。
In order to increase the efficiency of data transmission, IP simplifies the protocol by not providing a reliable communication facility. There are no acknowledgments either end-to-end or hop-by-hop. There is no error control for data, only a header checksum provides a verification that the information used in processing internet datagram has been transmitted correctly. There are no retransmissions. There is no flow control. The RFC documents give the algorithms used to compute the checksum and the wireshark software provides the function of catching the IP packets. This data can be used to verify the algorithms . The research also shows there is a bug in the algorithm and can be overcomed and optimised.
作者
刘派
LIU Pai （School of Software Engineering,Beijing University of Posts and Telecommunications, Beijing 100876, China）
出处
《电脑知识与技术》
2010年第7期5194-5196,共3页
Computer Knowledge and Technology
关键词
IP
头部校验和
算法
验证
internet protocol
header checksum
algorithm
verification
