TCP initial window size is 5840?

本文解释了当在Linux环境下使用Firefox打开HTML文件时,TCP SYN包中显示的Win=5840实际上表示的是经过windowscale选项调整后的初始窗口大小。Linux计算这个值的方式较为复杂,通过`tcp_select_initial_window()`函数实现。

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If you open an html with Firefox on Linux, the tcpdump might show SYN packet with "Win=5840". Does it mean TCP initial advertised window size is 5840?

 

No. In fact, there is another field in TCP option, "window scale=6". So the real initial is 5840 * 2^6 = 373760.

 

This feature is defined RFC1323, called "window scale".

 

Linux calculate this value in a rather complicated way. For detail, you could refer "tcp_select_initial_window()" in net/ipv4/tcp_output.c

 

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