tcp server/client 송수신 하는걸 tcpdump 로 떠봤는데 희한합니다.

10.10.1.129가 서버인데 왜 FIN Ack 보내고 RST ACK 바로 보내나요?



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21:42:45.336174 IP 10.10.1.66.44690 > 10.10.1.129.gandalf-lm: Flags [S], seq 928454348, win 5840, options [mss 1460,sackOK,TS val 3245075908 ecr 0,nop,wscale 7], length 0
21:42:45.336218 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [S.], seq 2688305193, ack 928454349, win 14480, options [mss 1460,sackOK,TS val 511913413 ecr 3245075908,nop,wscale 7], length 0
21:42:45.336771 IP 10.10.1.66.44690 > 10.10.1.129.gandalf-lm: Flags [.], ack 1, win 46, options [nop,nop,TS val 3245075908 ecr 511913413], length 0
21:42:45.336774 IP 10.10.1.66.44690 > 10.10.1.129.gandalf-lm: Flags [P.], seq 1:2, ack 1, win 46, options [nop,nop,TS val 3245075909 ecr 511913413], length 1
21:42:45.336815 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [.], ack 2, win 114, options [nop,nop,TS val 511913414 ecr 3245075909], length 0
21:42:45.336992 IP 10.10.1.66.44690 > 10.10.1.129.gandalf-lm: Flags [P.], seq 2:36, ack 1, win 46, options [nop,nop,TS val 3245075909 ecr 511913414], length 34
21:42:45.337001 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [.], ack 36, win 114, options [nop,nop,TS val 511913414 ecr 3245075909], length 0
21:42:46.409141 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [P.], seq 1:600, ack 36, win 114, options [nop,nop,TS val 511914485 ecr 3245075909], length 599
21:42:46.409341 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [F.], seq 600, ack 36, win 114, options [nop,nop,TS val 511914485 ecr 3245075909], length 0
21:42:46.409388 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [R.], seq 601, ack 36, win 114, options [nop,nop,TS val 511914485 ecr 3245075909], length 0
21:42:46.409720 IP 10.10.1.66.44690 > 10.10.1.129.gandalf-lm: Flags [.], ack 600, win 55, options [nop,nop,TS val 3245076982 ecr 511914485], length 0
21:42:46.409740 IP 10.10.1.129.gandalf-lm > 10.10.1.66.44690: Flags [R], seq 2688305793, win 0, length 0


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