data -> some data
<- ACK got it
FIN -> done, close the connection (FIN_WAIT1)
<- ACK saw the FIN,agree (CLOSE_WAIT)
<- FIN closing my end too (FIN_WAIT2)
ACK -> saw your FIN also (LAST_ACK) <-- 就这里。
============================
data -> some data
<- ACK got it
FIN -> done, close the connection (FIN_WAIT1)
<- ACK saw the FIN,agree (CLOSE_WAIT)
<- FIN closing my end too (FIN_WAIT2)
ACK -> saw your FIN also (LAST_ACK) <-- 就这里。
============================