{"id":976,"date":"2015-12-29T14:29:15","date_gmt":"2015-12-29T14:29:15","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=976"},"modified":"2015-12-29T14:29:15","modified_gmt":"2015-12-29T14:29:15","slug":"tcp-time-wait-%ea%b0%9c%eb%85%90","status":"publish","type":"post","link":"http:\/\/haisins.synology.me\/wordpress\/?p=976","title":{"rendered":"TCP Time wait \uac1c\ub150"},"content":{"rendered":"

TCP<\/SPAN>\ub294 \uc5ec\ub7ec\uac1c\uc758 State<\/SPAN>\ub97c \uac00\uc9c8\uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uc608\ub97c\ub4e4\uc5b4 CLOSED(<\/SPAN>\uc5f0\uacb0\uc774 \ub2eb\ud614\uc744\ub54c) LISTEN(<\/SPAN>\uc5f0\uacb0\uc744 \uae30\ub2e4\ub9ac\uace0 \uc788\uc744\ub54c), ESTABLISHED(<\/SPAN>\uc5f0\uacb0\uc774 \ub418\uc5c8\uc744\ub54c) <\/SPAN>\ub4f1\ub4f1\uc758 \uc0c1\ud0dc\ub97c \uac00\uc9c8\uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uc774\uc911\uc5d0\uc11c TIME_WAIT<\/SPAN>\ub77c\ub294 \uc0c1\ud0dc\uac00 \uc788\ub294\ub370, <\/SPAN>\uc774\ud574\ud558\uae30 \uac00\uc7a5 \uc5b4\ub824\uc6b4 \ubd80\ubd84\uc778\uac83 \uac19\uc2b5\ub2c8\ub2e4. TIME_WAIT <\/SPAN>\uc0c1\ud0dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uacbd\uc6b0\uc5d0 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. <\/SPAN>\uc6b0\uc120 Client<\/SPAN>\uc640 Server<\/SPAN>\uac00 TCP<\/SPAN>\ub85c \uc5f0\uacb0\uc774 \ub418\uc5b4 \uc788\ub2e4\uace0 \uac00\uc815\ud569\uc2dc\ub2e4. <\/SPAN>\uc774\ub54c \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc5f0\uacb0\uc744 \ub04a\uc73c\ub824\uba74 close<\/SPAN>\ud568\uc218\ub97c \ud638\ucd9c\ud569\ub2c8\ub2e4. <\/SPAN>\uc774 \ud568\uc218\ub97c \ud638\ucd9c\ud558\uba74 \uc11c\ubc84\uc5d0 FIN segment<\/SPAN>\ub97c \ubcf4\ub0b4\uac8c \ub429\ub2c8\ub2e4. <\/SPAN>\uadf8\ub7ec\uba74 \uc11c\ubc84\ub294 \uc774 \uba54\uc2dc\uc9c0\ub97c \ubc1b\uace0 \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc811\uc18d\uc744 \ub04a\uc73c\ub824\uace0 \ud558\ub294 \uac83\uc744 \uc54c\uac8c\ub429\ub2c8\ub2e4. <\/SPAN>\ub530\ub77c\uc11c \uc11c\ubc84\uac00 CLOSE_WAIT <\/SPAN>\uc0c1\ud0dc\uac00 \ub418\uba74\uc11c \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uac8c ack segment<\/SPAN>\ub97c \ubcf4\ub0c5\ub2c8\ub2e4. <\/SPAN>\uc989 “<\/SPAN>\ub124\uac00 \uc811\uc18d\uc744 \ub04a\ub294 \ub2e4\ub294 \uc2e0\ud638\ub97c \ubc1b\uc558\ub2e4” <\/SPAN>\uc774\ub7f0 \uc758\ubbf8\uc785\ub2c8\ub2e4. <\/SPAN>\uc774 \uba54\uc2dc\uc9c0\ub97c \ubc1b\uc73c\uba74 \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 FIN_WAIT_2 <\/SPAN>\uc0c1\ud0dc\uac00 \ub429\ub2c8\ub2e4. <\/SPAN>\uc774 \uc0c1\ud0dc\uc5d0\uc11c \uc11c\ubc84\ub294 \uc790\uc2e0\uc758 socket<\/SPAN>\uc744 close<\/SPAN>\ud558\uace0 \ub2e4\uc2dc \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uac8c FIN segment<\/SPAN>\ub97c \ubcf4\ub0c5\ub2c8\ub2e4. <\/SPAN>\uc989 \uc790\uc2e0\ub3c4 \uc5f0\uacb0\uc744 \ub2eb\uc558\ub2e4\ub294 \uc2e0\ud638\ub97c \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uac8c \ubcf4\ub0b4\ub294 \uac83\uc785\ub2c8\ub2e4. <\/SPAN>\uc774 \uba54\uc2dc\uc9c0\ub97c \ubc1b\uc73c\uba74 \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 ack segment<\/SPAN>\ub97c \ubcf4\ub0b4\uba74\uc11c TIME_WAIT <\/SPAN>\uc0c1\ud0dc\uac00 \ub429\ub2c8\ub2e4. <\/SPAN>\uc989 \uc11c\ub85c\uac04\uc758 \ud655\uc778\ud558\uc5d0 \uc644\uc804\ud788 \uc5f0\uacb0\uc774 \ub04a\uae30\uac8c \ub429\ub2c8\ub2e4. <\/SPAN>\uadfc\ub370 \uc774 \uc0c1\ud0dc\uc5d0\uc11c \uace7\ubc14\ub85c CLOSED <\/SPAN>\uc0c1\ud0dc\uac00 \ub418\ub294 \uac83\uc774 \uc544\ub2c8\ub77c 2 MSL(maximum segment lifetime – 1<\/SPAN>\ubd84~4<\/SPAN>\ubd84) <\/SPAN>\ub3d9\uc548 TIME_WAIT<\/SPAN>\uc0c1\ud0dc\ub97c \uc720\uc9c0\ud569\ub2c8\ub2e4. <\/SPAN>\uc65c \uace7\ubc14\ub85c CLOSED <\/SPAN>\uc0c1\ud0dc\uac00 \ub418\uc9c0 \uc54a\uace0 \uc77c\uc815\uc2dc\uac04 \ub3d9\uc548 TIME_WAIT <\/SPAN>\uc0c1\ud0dc\uac00 \ub418\ub294 \uac83\uc77c\uae4c\uc694? <\/SPAN><\/SPAN><\/P>
\n

\ubb54\uac00 \uc774\uc0c1\ud558\uc9c0 \uc54a\uc2b5\ub2c8\uae4c? <\/SPAN>\uadf8 \uc774\uc720\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. TCP<\/SPAN>\ub294 \uc2e0\ub8b0\uc131\uc744 \ubcf4\uc7a5\ud574 \uc8fc\ub294 \ud504\ub85c\ud1a0\ud074 \uc785\ub2c8\ub2e4.(UDP<\/SPAN>\ub294 \uc544\ub2c8\uc9c0\uc694.) <\/SPAN>\ub530\ub77c\uc11c \uc5f0\uacb0\uc2dc\uc5d0\ub3c4 \uc2e0\ub8b0\uc131\uc744 \ubcf4\uc7a5\ud558\uae30 \uc704\ud558\uc5ec Three-way handshake<\/SPAN>\ub77c\ub294 \uae30\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc5f0\uacb0\uc744 \ud558\uace0 \uc885\ub8cc\uc2dc\uc5d0\ub3c4 \uc704\uc640\uac19\uc774 \ubcf5\uc7a1\ud55c \uacfc\uc815\uc744 \uac70\uccd0 \uc11c\ub85c\uac00 close<\/SPAN>\ub41c\uac83\uc744 \ud655\uc778\ud558\uac8c \ub418\ub294 \uac83\uc785\ub2c8\ub2e4. TIME_WAIT <\/SPAN>\uc0c1\ud0dc\ub3c4 \uc774\uc640\uac19\uc740 \uc2e0\ub8b0\uc131 \ubcf4\uc7a5\uc744 \uc704\ud55c \ud55c\uac00\uc9c0 \ubc29\ubc95\uc774\ub77c\uace0 \ubcf4\uc2dc\uba74 \ub429\ub2c8\ub2e4. <\/SPAN><\/SPAN><\/P>
\n

Unix Network Programming<\/SPAN>\uc5d0 \ubcf4\uba74 TIME_WAIT <\/SPAN>\uc0c1\ud0dc\uac00 \uc788\ub294 \uc774\uc720\uc5d0 \ub300\ud574 \ub2e4\uc74c\uacfc \uac19\uc774 \uc124\uba85\ud558\uc600\uc2b5\ub2c8\ub2e4. <\/SPAN><\/SPAN><\/P>
\n

1. to implement TCP’s full-duplex connection termination reliably, and
2. to allow old duplicate segments to expire in the network. <\/SPAN><\/P>
\n

\ud760 \uccab\ubc88\uc9f8\ub294 \uc2e0\ub8b0\uc131\uc788\ub294 \uc5f0\uacb0 \uc885\ub8cc\ub97c \uc704\ud55c \uac83\uc774\ub77c\uace0 \uc4f0\uc5ec\uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uadfc\ub370 \ub450\ubc88\uc9f8\ub294 \ubb34\uc5c7\uc77c\uae4c\uc694?
network<\/SPAN>\uc5d0 \uc788\ub294 duplicate segments<\/SPAN>\ub4e4\uc774 \uc18c\uba78\uc2dc\ud0a4\uae30 \uc704\ud574\uc11c?? <\/SPAN><\/SPAN><\/P>
\n

<\/SPAN>\uc774 \ub450\uac00\uc9c0\uc5d0 \ub300\ud558\uc5ec \uc790\uc138\ud788 \uc124\uba85\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. <\/SPAN><\/SPAN><\/P>
\n

\uba3c\uc800 \uccab\ubc88\uc9f8\uc5d0 \ub300\ud574\uc11c \uc124\uba85\ud558\uaca0\uc2b5\ub2c8\ub2e4.
<\/SPAN>\uc774\uac83\uc740 \ub9d0\uadf8\ub300\ub85c \uc2e0\ub8b0\uc131\uc788\uc740 \uc5f0\uacb0 \uc885\ub8cc\ub97c \uc704\ud55c\uac83\uc785\ub2c8\ub2e4. <\/SPAN>\ub2e4\uc74c\uacfc \uac19\uc740 \uc0c1\ud669\uc744 \uac00\uc815\ud569\uc2dc\ub2e4. <\/SPAN>\ud074\ub77c\uc774\uc5b8\ud2b8\uac00 FIN_WAIT_2 <\/SPAN>\uc0c1\ud0dc\uc5d0\uc11c \uc11c\ubc84\uc758 FIN segment<\/SPAN>\ub97c \ubc1b\uc73c\uba74 TIME_WAIT<\/SPAN>\uc0c1\ud0dc\uac00 \ub418\uba74\uc11c \uc11c\ubc84\uc5d0 ack segment<\/SPAN>\ub97c \ubcf4\ub0b8\ub2e4\uace0 \ud558\uc600\uc2b5\ub2c8\ub2e4. <\/SPAN>\ud558\uc9c0\ub9cc \uc774 ack segment<\/SPAN>\uac00 \ub124\ud2b8\uc6cc \ud06c\uc758 \uc624\ub958\ub85c \uc778\ud574 \uc11c\ubc84\uc5d0 \ub3c4\ucc29\ud558\uc9c0 \ubabb\ud560\uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uadf8\ub7f0 \uacbd\uc6b0\ub77c\uba74 \uc11c\ubc84\uc5d0\uc11c\ub294 \uc77c\uc815\uc2dc\uac04 \uc774\ud6c4\uc5d0 \ub2e4\uc2dc \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uac8c FIN segment<\/SPAN>\ub97c \ubcf4\ub0c5\ub2c8\ub2e4. <\/SPAN>\uc790\uc2e0\uc774 \uc751\ub2f5\uc744 \ubabb\ubc1b\uc558\uc73c\ub2c8 \ub2e4\uc2dc \ubcf4\ub0b4\ub2ec\ub77c\ub294 \uc758\ubbf8\uc9c0\uc694. <\/SPAN>\ub9cc\uc57d \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 CLOSED <\/SPAN>\uc0c1\ud0dc \uc989 \uc5f0\uacb0\uc774 \ub2eb\ud600 \uc788\ub294 \uc0c1\ud0dc\uc5d0\uc11c \uc11c\ubc84\uac00 \ub2e4\uc2dc \ubcf4\ub0b8 \uc774 FIN segment<\/SPAN>\ub97c \ubc1b\uc73c\uba74 \uc5b4\ub5bb\uac8c \ub420\uae4c\uc694? <\/SPAN>\uadf8\ub7f0 \uacbd\uc6b0\ub77c\uba74 ack<\/SPAN>\ub300\uc2e0 RST<\/SPAN>\ub77c\ub294 segment<\/SPAN>\ub97c \ubcf4\ub0b4\uac8c\ub429\ub2c8\ub2e4. <\/SPAN>\uc989 CLOSED <\/SPAN>\ub418\uba74\uc11c \uc774\uc804\uc5d0 \uc11c\ubc84\uc640 \uc5f0\uacb0\ud588\ub358 \uc815\ubcf4\ub4e4\uc774 \uc804\ubd80 \uc5c6\uc5b4\uc84c\uc73c\ubbc0\ub85c \uc11c\ubc84\uac00 \ub2e4\uc2dc \uc694\uccad\uc744 \ud558\uba74 “<\/SPAN>\ub098\ub294 \ub108\ub97c \ubaa8\ub978\ub2e4. <\/SPAN>\uc65c \uc774\uc0c1\ud55c \uba54\uc2dc\uc9c0\ub97c \ubcf4\ub0b4\ub290\ub0d0?” <\/SPAN>\ud558\uba74\uc11c \uc11c\ubc84\uac00 \uc6d0\ud558\ub294 ack <\/SPAN>\ub300\uc2e0 RST<\/SPAN>\ub77c\ub294 segment<\/SPAN>\ub97c \ubcf4\ub0b4\uac8c \ub418\ub294 \uac83\uc785\ub2c8\ub2e4. <\/SPAN>\uc774\ub7f0 \uc0c1\ud669\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud558\uc5ec \uc77c\uc815\uc2dc\uac04 \ub3d9\uc548 TIME_WAIT<\/SPAN>\ub77c\ub294 \uc0c1\ud0dc\ub97c \uc720\uc9c0\ud558\uc5ec \uc11c\ubc84\uac00 \ub2e4\uc2dc FIN<\/SPAN>\uc744 \ubcf4\ub0c8\uc744\ub54c \ub300\ub2f5\ud560\uc218 \uc788\uac8c \ud574\uc90d\ub2c8\ub2e4. <\/SPAN><\/SPAN><\/P>
\n

\ub450\ubc88\uc9f8\uc5d0 \ub300\ud55c \uc124\uba85\uc785\ub2c8\ub2e4.
<\/SPAN>\ub2e4\uc74c\uacfc \uac19\uc740 \uc0c1\ud669\uc744 \uac00\uc815\ud574 \ubd05\uc2dc\ub2e4.
<\/SPAN>\uc6b0\uc120 \ud604\uc7ac 111.111.111.111:23 <\/SPAN>\ubc88\ud558\uace0 111.111.111.112:1500<\/SPAN>\ubc88\uc774 \uc5f0\uacb0\ub418\uc5b4 \uc788\ub2e4\uace0 \ud569\uc2dc\ub2e4.<\/SPAN>\ub458\uc774 \ub9c9 \ud328\ud0b7\uc744 \uc8fc\uace0 \ubc1b\ub2e4\uac00 \ub458\uc774 \uc5f0\uacb0\uc744 \uc815\uc0c1\uc801\uc73c\ub85c \ub04a\uc5c8\ub2e4\uace0 \uac00\uc815\ud569\uc2dc\ub2e4. <\/SPAN>\uadf8 \ud6c4\uc5d0 \ub458\uc774 \uace7\ubc14\ub85c \uc5f0\uacb0\uc744 \ud574\uc11c \ubc29\uae08\uc804\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c 111.111.111.111:23 <\/SPAN>\uacfc 111.111.111.112:1500<\/SPAN>\uc73c\ub85c \uc5f0\uacb0\ub418\uc5c8\ub2e4\uace0 \ud569\uc2dc\ub2e4. <\/SPAN>\uadfc\ub370 \uc5ec\uae30\uc11c \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uc600\uc2b5\ub2c8\ub2e4. <\/SPAN>\ubc14\ub85c \uc774\uc804\uc5d0 \uc5f0\uacb0\uc774 \uc131\ub9bd\ub418\uc5c8\uc744\ub54c 111<\/SPAN>\ubc88\uc5d0\uc11c 112<\/SPAN>\ubc88\uc73c\ub85c \ubcf4\ub0b8 \ud328\ud0b7\ud558\ub098\uac00 \ub77c\uc6b0\ud130\uc758 \uc624\ub958\ub85c \uc778\ud130\ub137\uc744 \ube91\ube91\uc774 \ub3cc\ub2e4\uac00 \uc774\uc804 \uc5f0\uacb0\uc774 \ub04a\uc5b4\uc9c0\uace0 \uc9c0\uae08 \uc0c8\ub85c\uc6b4 \uc5f0\uacb0\uc774 \ub418\uc5c8\uc744\ub54c 112<\/SPAN>\ubc88\uc5d0 \ub3c4\ucc29\ud588\uc2b5\ub2c8\ub2e4. <\/SPAN>\ubb34\uc2a8 \uc18c\ub9ac\ub0d0\uad6c\uc694? <\/SPAN>\uc608\ub97c \ub4e4\uc5b4 \ub77c\uc6b0\ud130 A<\/SPAN>\uc640 B<\/SPAN>\uac00 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uadfc\ub370 \ub77c\uc6b0\ud130\uc758 \uc77c\uc2dc\uc801\uc778 \uc624\ub958\ub85c \ub77c\uc6b0\ud130 A<\/SPAN>\uc758 \ub370\uc774\ud0c0\uac00 B<\/SPAN>\ub85c \uc804\uc1a1\ud558\uba74 B<\/SPAN>\uac00 \ub2e4\uc2dc A<\/SPAN>\ub85c \uadf8 \ub370\uc774\ud0c0\ub97c \uc804\uc1a1\ud558\uc5ec \uc21c\uac04\uc801\uc778 \ub8e8\ud504\uc5d0 \ube60\uc9c8\uc218\uac00 \uc788\uc744 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\uc774\ub807\uac8c \ub8e8\ud504\uc5d0 \ube60\uc9c0\ub358 \ub188\uc774 \uc774\uc804 \uc5f0\uacb0\uc774 \ub05d\ub098\uace0 \uc0c8\ub85c\uc6b4 \uc5f0\uacb0\uc774 \uc0dd\uacbc\uc744 \ub54c \ub3c4\ucc29\ud55c\ub2e4\uba74 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uaca0\uc8e0? <\/SPAN>\uc989 \uc6d0\ud558\uc9c0 \uc54a\ub294 \ub370\uc774\ud0c0\uac00 \uc804\uc1a1\ub418\uc5c8\uc73c\ub2c8 \uc624\ub958\uac00 \ubc1c\uc0dd\ud560 \uc218 \ub3c4 \uc788\ub294 \uac83\uc785\ub2c8\ub2e4. <\/SPAN>\uc774\uac83\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud558\uc5ec TIME_WAIT <\/SPAN>\uc0c1\ud0dc\ub97c \ub461\ub2c8\ub2e4. TIME_WAIT<\/SPAN>\uc0c1\ud0dc\uc5d0 \uc788\ub294 \ub3d9\uc548\uc740 \uac19\uc740 \uc5f0\uacb0\uc774 \ubc1c\uc0dd\ud558\uc9c0 \ubabb\ud558\ub3c4\ub85d \ubc29\uc9c0\ud569\ub2c8\ub2e4. <\/SPAN>\uc989 \uc774\uc804\uc5d0 \ub0b4\uac00 \uc5f0\uacb0\ub418\uc5c8\ub358 \ud3ec\ud2b8\uac00 1500<\/SPAN>\ubc88\uc774\ub77c\uba74 \ub2e4\uc74c \uc5f0\uacb0\uc740 \ud604\uc7ac 1500<\/SPAN>\ubc88\uc774 TIME_WAIT<\/SPAN>\uc774\ubbc0\ub85c 1501<\/SPAN>\ubc88\uc73c\ub85c \uc5f0\uacb0\ub418\uac8c \ub429\ub2c8\ub2e4. <\/SPAN>\uadf8\ub807\uac8c \ud558\uba74 \uc704\uc640\uac19\uc740 \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/SPAN>\ubcf4\ud1b5 TIME_WAIT<\/SPAN>\uc0c1\ud0dc\ub294 2 MSL<\/SPAN>\uc785\ub2c8\ub2e4. <\/SPAN>\uc989 \uc778\ud130\ub137 \uc0c1\uc5d0\uc11c \ud328\ud0b7\uc774 \uc874\uc7ac\ud558\ub294 \uc2dc\uac04\ubcf4\ub2e4 \uae38\uac8c \uc124\uc815\ub429\ub2c8\ub2e4. <\/SPAN>\uadf8\ub7ec\ubbc0\ub85c TIME_WAIT<\/SPAN>\uc0c1\ud0dc\uac00 \ub04a\ub098\uba74 \uc778\ud130\ub137 \uc0c1\uc5d0\uc11c\ub294 \uc774\uc804 \uc5f0\uacb0\uc5d0 \ubcf4\ub0b4\uc84c\ub358 \ud328\ud0b7\uc774 \ubaa8\ub450 \uc18c\uba78\ub418\uc5c8\ub2e4\uace0 \ud655\uc2e0\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uc0c8\ub85c\uc6b4 \uc5f0\uacb0\uc744 \ub9cc\ub4e4\uc5b4\ub3c4 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\ub294\uac83\uc785\ub2c8\ub2e4..  <\/SPAN><\/SPAN><\/P>
\n

 <\/P><\/p>\n","protected":false},"excerpt":{"rendered":"

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