A simple TCP extension for high-speed paths
Zheng Wang, Jon Crowcroft, Ian Wakeman · ACM SIGCOMM Computer Communication Review · 1992
RFC-1072 and RFC-1185 have proposed a new TCP option "Echo/Echo Reply", in which timestamps are carried in TCP headers to aid in extending the sequence number space beyond 32 bits. However, such an extension will add an extra 64 bits to the TCP header and will require option processing for each packet at both ends. In this paper, we propose a simpler TCP extension that expands the sequence number space without increasing the size of the TCP header.