- 参见 https://www.iana.org/assignments/version-numbers/version-numbers.xhtml#version-numbers-1
- 参见https://tools.ietf.org/html/rfc1819
- ip minimum packet size is 576B, minus fixed ip header(20B) and tcp header(20B), then max mss is 536B, 参见https://tools.ietf.org/html/rfc6691
- 如下:
- client: SYN i
- server: SYN j, ACK i+1
- client: ACK j+1
- server: response data(26B)
- client: ACK i+2, FIN m (client socket status: FIN_WAIT_1)
- server: ACK m+1, FIN n (client socket status: FIN_WAIT_2, server socket status: CLOSE_WAIT)
- client: ACK n+1 (client socket status: TIME_WAIT, server socket status: CLOSED)
- no mss options specified, then user max mss 536B
- 89, 参见https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml#protocol-numbers-1, also https://tools.ietf.org/html/rfc2328#page-42
- no yet knows
最后
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