服务端close_wait 模拟

标志        3字符缩写        描 述
 S            SYN                同步序号
 F            FIN               发送方完成数据发送
 R            RST              复位连接
 P            PSH              尽可能快地将数据送往接收进程
.                             以上四个标志比特均置0


node2:/root/test#netstat -na | grep 9090
tcp        0      0 192.168.137.3:46772         192.168.137.2:9090          FIN_WAIT2 


node1:/root/test#netstat -na | grep 9090
tcp        0      0 0.0.0.0:9090                0.0.0.0:*                   LISTEN      
tcp        0      0 192.168.137.2:9090          192.168.137.3:46772         CLOSE_WAI

08:22:27.137358 IP node2.46772 > node1.websm: Flags [S], seq 2005546350, win 14600, options [mss 1460,sackOK,TS val 86899574 ecr 0,nop,wscale 7], length 0
08:22:27.137613 IP node1.websm > node2.46772: Flags [S.], seq 71170429, ack 2005546351, win 14480, options [mss 1460,sackOK,TS val 93251074 ecr 86899574,nop,wscale 6], length 0
08:22:27.137648 IP node2.46772 > node1.websm: Flags [.], ack 1, win 115, options [nop,nop,TS val 86899574 ecr 93251074], length 0

08:22:27.137922 IP node2.46772 > node1.websm: Flags [F.], seq 1, ack 1, win 115, options [nop,nop,TS val 86899575 ecr 93251074], length 0
08:22:27.139026 IP node1.websm > node2.46772: Flags [.], ack 2, win 227, options [nop,nop,TS val 93251076 ecr 86899575], length 0


node2:/root/test#python test.py 
('192.168.137.3', 46772)
('192.168.137.2', 9090)