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客户端和服务端通知对方版本的那个包到底是谁先发谁后发呢？我自己观察到的是客户端先发，但是看别人抓包则相反( https://www.youtube.com/watch?v=XfWQ-jXPd8g)
服务端等客户端先发有什么好处？，为何不惜增大连接建立所用时间这样做呢
Supplement 1 · Jan 22, 2017
最后一句说错，应为“（像视频里一样）客户端等服务端……”
补图： https://stackoverflow.com/questions/16205240/which-side-will-initiate-the-version-negotiation-in-the-ssh-transport-layer-prot
补图： https://stackoverflow.com/questions/16205240/which-side-will-initiate-the-version-negotiation-in-the-ssh-transport-layer-prot
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bearice Jan 22, 2017
“ When the connection has been established, both sides MUST send an identification string.” --rfc4253
其实就是谁先发都无所谓，反正 TCP 是全双工通信的 |
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LPeJuN6lLsS9 OP @bearice 题目起错了， tcp 是全双工所以两边一起发可节约时间，但是图和视频里客户端明显在等服务端
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