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hiboma id:hiboma

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TCP æŽ¥æ”¶çª—å£
æœ€è¿‘æœ‰ç©ºé˜…è¯»äº†ä¸€äº› TCP çª—å£ç›¸å…³çš„å†…æ ¸ä»£ç ï¼ŒçŸ¥è¯†ç‚¹ç›¸å¯¹æ¯”è¾ƒçç¢Žï¼Œåšä¸€äº›ç®€å•çš„ç¬”è®°ï¼Œæœ¬ç¯‡ä¸»è¦å…³äºŽ TCP æŽ¥æ”¶çª—å£ã€‚ æœ¬ç¯‡ä¸»è¦åŸºäºŽ Linux v5.2.2 å†…æ ¸ï¼Œå¦‚æœ‰ä¸å‡†ç¡®ä¹‹å¤„ï¼Œä¼šæ—¥åŽä¿®è®¢ã€‚ å‰ç½®çŸ¥è¯†åœ¨ TCP ä¼ è¾“ä¸æåˆ°çš„çª—å£ä¸€èˆ¬æœ‰ä¸‰ä¸ªï¼ŒæŽ¥æ”¶çª—å£ã€å‘é€çª—å£å’Œæ‹¥å¡žçª—å£ï¼š æŽ¥æ”¶çª—å£ï¼šä¸€èˆ¬æ˜¯æŽ¥æ”¶ç«¯å‘å‘é€ç«¯é€šå‘Šè‡ªå·±è¿˜å¯ä»¥æŽ¥æ”¶å’Œç¼“å†²å¤šå°‘æ•°æ®ï¼Œ å¯åœ¨ç”¨æˆ·æ€é€šè¿‡è®¾ç½® SO_RCVBUF ä¸€å®šç¨‹åº¦ä¸Šè°ƒæ•´åˆå§‹çš„æŽ¥å—çª—å£å¤§å°ã€‚ æ‹¥å¡žçª—å£ï¼šå¯ä»¥ç†è§£ä¸ºæ‹¥å¡žç®—æ³•å®šä¹‰çš„é€»è¾‘çª—å£ï¼Œæ˜¯æœ‰å‘é€ç«¯çš„æµæŽ§ç®—æ³•ï¼Œä¸€èˆ¬æ˜¯ MSSï¼ˆæœ€å¤§åˆ†æ®µå¤§å°ï¼‰çš„æ•°å€ã€‚åœ¨ä¸€èˆ¬æ„ä¹‰çš„æ‹¥å¡žç®—æ³•ä¸ï¼Œçª—å£åœ¨æ…¢å¼€å§‹é˜¶æ®µå¢žé•¿ï¼Œå½“çª—å£å€¼åˆ°è¾¾ ssthreshï¼ˆæ…¢å¯åŠ¨é˜ˆå€¼ï¼‰æˆ–æ•°æ®ä¸¢å¤±æ—¶ï¼Œä¼šè¿›è¡Œç›¸åº”è°ƒæ•´ã€‚æ€»ä¹‹ï¼Œè¿™æ˜¯ä¸€ä¸ªç”±æ‹¥å¡žç®—æ³•æ‰€æŽ§åˆ¶çš„çª—å£ã€‚ å‘é€çª—å£ï¼šç®—æ˜¯ä¸€ä¸ªç»¼åˆæ€§çš„çª—å£ï¼Œä¸»è¦ç”¨äºŽè°ƒæ•´å¯å‘é€æ•°æ®çš„å¤§å°ï¼Œå’Œå‘é€ç¼“å†²åŒºå‰©ä½™å¤§å°ï¼Œæ‹¥å¡žçª—å£åŠå‘é€ä¸çš„æ•°æ®åŒ…é‡ï¼ˆpac
hiboma 2020/01/10
__tcp_select_window ã«ã¤ã„ã¦

kernel

tcp
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TCP half-open - Wikipedia
This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources:Â "TCP half-open"Â â€“Â newsÂ Â· newspapersÂ Â· booksÂ Â· scholarÂ Â· JSTOR (May 2017) (Learn how and when to remove this message) The term half-open refers to TCP connections whose state is out of synchronization between the two commun
hiboma 2015/03/11
"According to RFC 793, a TCP connection is referred to as half-open when the host at one end of that TCP connection has crashed, or has otherwise removed the socket without notifying the other end. "

tcp
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TCP Retransmitãƒ»DupACKãƒ»Fast Retransmit ï½žãƒˆãƒ©ãƒ–ãƒ«ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³ã‚°æ™‚ã®ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ï½ž - troushoo
ä»Šå›žã¯ã€TCP Retransmit ã¨ DupACK ã¨ Fast Retransmit ã®ç´¹ä»‹ã‚’è¡Œã„ã¾ã™ã€‚ ã„ãšã‚Œã‚‚ã€ãƒ‘ã‚±ãƒƒãƒˆãƒã‚¹ã¨ã„ã£ãŸãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®æ€§èƒ½ãŒå‡ºãªã„æ™‚ã«å‡ºç¾ã™ã‚‹ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã§ã™ã€‚ ã€TCP Retransmitã€‘ Retransmit ã¨ã¯â€å†é€â€ã‚’æ„å‘³ã™ã‚‹è‹±å˜èªžã§ã™ã€‚ TCPã§ã¯ã€TCPãƒ‡ãƒ¼ã‚¿ã®é€ä¿¡è€…ãŒã€å—ä¿¡è€…ã‹ã‚‰ACKã‚’å—ã‘å–ã‚Œãªã‹ã£ãŸå ´åˆã€TCPãƒ‡ãƒ¼ã‚¿ã®å†é€(=Retransmit)ã‚’è¡Œã„ã¾ã™ã€‚ ã“ã‚ŒãŒTCP Retransmitã§ã™ã€‚ TCP Retrasm itã®ç™ºç”Ÿã¯ã€é€ä¿¡è€…ã¨å—ä¿¡è€…ã®é–“ã§ã®ãƒ‘ã‚±ãƒƒãƒˆãƒã‚¹ã®å¯èƒ½æ€§ã‚’ç¤ºå”†ã—ã¦ã„ã¾ã™ã€‚ ä»¥ä¸‹ã®ä¾‹ã¯ã€RetransmitãŒèµ·ã“ã£ã¦ã„ã‚‹ã¨ãã®ãƒ‘ã‚±ãƒƒãƒˆã‚ãƒ£ãƒ—ãƒãƒ£ã§ã™ã€‚ â‘ ã§ã€192.168.122.129ã¸ â€HTTP/1.1 200 OKâ€ ã¨ã„ã†ãƒ‡ãƒ¼ã‚¿ã‚’é€ã£ã¦ã„ã¾ã™ã€‚ â‘¡ã®é–“ã€192.168.122.129ã¸ACKãŒå—ä¿¡
hiboma 2014/12/17
TCP Retransmit ã¨ DupACK ã¨ Fast Retransmitã€‚munin ã®ã‚°ãƒ©ãƒ•è¦‹ã¦ã¦ã‚‚æ„å‘³åˆ†ã‹ã‚‰ã‚“ã‹ã£ãŸ

tcp

network
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Forums
You have been redirected here because the page you are trying to access has been archived. AWS re:Post is a cloud knowledge service launched at re:Invent 2021. We've migrated selected questions and answers from Forums to AWS re:Post. The thread you are trying to access has outdated guidance, hence we have archived it. If you would like up-to-date guidance, then share your question via AWS re:Post.
hiboma 2012/05/17
amazon

aws

tcp
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[ãƒ¡ãƒ¢] TCP/IPãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã«ãŠã‘ã‚‹ã‚¨ãƒ©ãƒ¼å‡¦ç† (RSTãƒ‘ã‚±ãƒƒãƒˆã®é£›ã°ã—æ–¹ã¨æ¤œå‡ºã®ä»•æ–¹) - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
SO_LINGER ã®ç§’æ•°ã‚’ 0 ã«ã—ã¦ã‚½ã‚±ãƒƒãƒˆã‚’é–‰ã˜ã‚Œã°ã„ã„ã€‚Perl ã§æ›¸ããªã‚‰ä»¥ä¸‹ã®ã‚ˆã†ãªæ„Ÿã˜ã€‚ setsockopt($sock, SOL_SOCKET, SO_LINGER, pack("II", 1, 0)) or die $!; $sock->close() ä¸€æ–¹ã§ RST ã«ã‚ˆã£ã¦åˆ‡æ– (ï¼ç•°å¸¸åˆ‡æ–ã•ã‚ŒãŸ) ã‹ã©ã†ã‹ã¯ã‚½ã‚±ãƒƒãƒˆã‹ã‚‰ã®èªã¿è¾¼ã¿ãŒ ECONNRESET ã‚¨ãƒ©ãƒ¼ã‚’è¿”ã™ã‹ã©ã†ã‹ã§åˆ¤æ–ã§ãã‚‹ï¼ˆæ£å¸¸åˆ‡æ–ãªã‚‰ 0 (==EOF) ãŒè¿”ã‚‹)ã€‚
hiboma 2011/07/07
SO_LINGER, ECONNRESET, RST

perl

tcp

socket

network
ãƒªãƒ³ã‚¯
stone (å‰ç·¨)
å®Ÿè·µã§å¦ã¶ã€ä¸€æ©é€²ã‚“ã ã‚µãƒ¼ãƒæ§‹ç¯‰ãƒ»é‹ç”¨è¡“ ç¬¬ 5 å›ž stone (å‰ç·¨) ãƒ‘ã‚±ãƒƒãƒˆã‚’ä¸ç¶™ã™ã‚‹ stone æ‹™ä½œã®ã€Œstoneã€ã¯ï¼Œ TCPï¼Œã‚ã‚‹ã„ã¯ UDP ã®ãƒ‘ã‚±ãƒƒãƒˆã‚’ä¸ç¶™ã™ã‚‹ï¼Œ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãƒ»ãƒ¬ãƒ™ãƒ«ã®ãƒ‘ã‚±ãƒƒãƒˆãƒ»ãƒªãƒ”ãƒ¼ã‚¿ã§ã™ã€‚ ç‰¹å®šã®ãƒ›ã‚¹ãƒˆã®ç‰¹å®šã®ãƒãƒ¼ãƒˆã«å¯¾ã™ã‚‹ TCP æŽ¥ç¶šã‚’ï¼Œ ä»–ã®ãƒ›ã‚¹ãƒˆã®ç‰¹å®šã®ãƒãƒ¼ãƒˆã¸ä¸ç¶™ã§ãã‚‹ã®ã§ï¼Œ ä¾¿åˆ©ã§ã™ã€‚ stone ã¯ Linux ã‚’ã¯ã˜ã‚ã¨ã™ã‚‹ UNIX ç³» OS ã®ã»ã‹ï¼Œ Windows NT ã‚„ Windows98/95ï¼ŒOS/2 ã®ä¸Šã§ã‚‚èµ°ã‚‰ã›ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ stone ã®å…¬å¼ãƒ›ãƒ¼ãƒ ãƒšãƒ¼ã‚¸ã¯ï¼Œ http://www.gcd.org/sengoku/stone/Welcome.ja.html ã§ã™ã€‚ â— TCP ã®ä¸ç¶™ ä¾‹ãˆã°ï¼Œ GCDï¼Š6 ã®å†…éƒ¨ LAN ä¸Šã®ãƒ›ã‚¹ãƒˆã€Œtakatsuã€ã¯ ãƒ—ãƒ©ã‚¤ãƒ™ãƒ¼ãƒˆãƒ»ã‚¢ãƒ‰ãƒ¬ã‚¹ã§ã‚ã‚‹ãŸã‚ï¼Œ å¤–éƒ¨ã‹ã‚‰ã‚¢ã‚¯ã‚»ã‚¹
hiboma 2011/04/20
network

tool

tcp

udp
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tcpflow -- TCP Flow Recorder
tcpflow -- A TCP Flow Recorder Note: I am no longer actively maintaining tcpflow. This page has the most recent version I released personally. Maintenance has been taken over by Simson Garfinkel, who distributes new versions at his site. Downloads and Documentation The most recent version of tcpflow is v0.21, released 7 August 2003. You can also see the history of previous releases. There is an HT
hiboma 2010/11/24
tcp

linux
ãƒªãƒ³ã‚¯
ã©ã•ã«ã£ã
2008å¹´4æœˆ21æ—¥(æœˆ) â– ç„¡é¡Œ _ ä»Šæœã®é›»è»Šã§ãŠã£ã•ã‚“ãŒèªã‚“ã§ãŸã‚¹ãƒãƒ¼ãƒ„æ–°èžã‹ã‚‰ã¡ã‚‡ã£ã¨è¦‹ãˆã¦ãŸè¦‹å‡ºã—ã€‚é ã®ãŠã‹ã—ã„äººãŒæ–°å¹¹ç·šã§å…¨è£¸ã«ãªã£ã¦ã‚¿ã‚¤ãƒ¼ãƒ›ã€‚æ˜¥ã ãªãã€‚ _ å‡ºç¤¾ã—ã¦ã‹ã‚‰ãƒ‹ãƒ¥ãƒ¼ã‚¹ã‚µã‚¤ãƒˆã‚’å·¡å›žã—ã¦ã€ãã‚ŒãŒ ãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆã‚µãƒ¼ãƒã®ç¤¾é•·ã ã£ãŸã¨çŸ¥ã‚‹ã€‚ã‚ãã€‚ _ ã¡ã€ã¡ãŒã†ã‚ˆã£ã€æ˜¥ã ã‹ã‚‰é ã®ãŠã‹ã—ã„äººãŒæ¹§ã„ã¦ããŸã‚“ã˜ã‚ƒãªã„ã‚ˆã£ã€‚ã ã£ã¦ãƒ¬ãƒ³ã‚¿ãƒ«ã‚µãƒ¼ãƒä¼šç¤¾ã®ç¤¾é•·ã ã‚ˆï¼Ÿ é ãŒãŠã‹ã—ã„ãªã‚“ã¦ã“ã¨ã¯ãªã„ã‚ˆã€‚æœ€è¿‘ã®ãƒ‡ãƒ¼ã‚¿ã‚»ãƒ³ã‚¿ãƒ¼ã¯é›»åŠ›å•é¡Œã¨ã‹ç†±å•é¡Œã¨ã‹ã„ã‚ã„ã‚å¤§å¤‰ã ã‹ã‚‰ãã€ãã£ã¨é™½æ°—ãŒã‚ˆããªã£ã¦ã‚ã£ãŸã‹ããªã£ãŸã‹ã‚‰ç†±æš´èµ°ã‚’èµ·ã“ã—ã¦ã€ãã®å†·å´ã®ãŸã‚ã«å¤§äº‹ãªã¨ã“ã‚ã‚’æ”¾ç†±ã—ã¦ãŸã ã‘ãªã‚“ã ã‚ˆã£ã€‚ _ ã¦ã‹ã€ãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆã‚µãƒ¼ãƒã£ã¦ã„ã¤ã®ã¾ã«ã‹ yahoo ã®ç³»åˆ—ã«ãªã£ã¦ãŸã®ã‹ã€‚æ˜”ã¯ã‚¯ãƒœã‚¿(ã‚‚ã¡ã‚ã‚“è¾²æ¥æ©Ÿæ¢°ã®ã‚¯ãƒœã‚¿ã®ã“ã¨ã )ã®åä¼šç¤¾ã ã£ãŸã‚ˆãã€ãŸã—ã‹ã€‚ 2008å¹´4æœˆ28æ—¥(æœˆ) â– ç„¡é¡Œ _ ãƒ¡ãƒ¼ãƒ«å±‹ã‚’å»ƒæ¥ã—
hiboma 2009/03/12
linux

tcp
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[unix] Linux SYNãƒ‘ã‚±ãƒƒãƒˆå–ã‚Šã“ã¼ã— (2) 2007-05-21 - LowPriority
å‰å›žã®ç¶šãã€‚ ãƒ‘ã‚±ãƒƒãƒˆè‡ªä½“ã‚’é›¶ã•ãšã«å‡¦ç†ã«å…¥ã£ãŸå¾Œã«SYNã‚’è½ã¨ã™ã®ã¯ä»¥ä¸‹3ãƒ‘ã‚¿ãƒ¼ãƒ³ã€‚ syncookieç„¡åŠ¹æ™‚ã«synã®backlog(tcp_max_syn_backlog)ãŒæº¢ã‚Œã¦ã„ã‚‹ listenã®backlogãŒæº¢ã‚Œã¦ã„ã‚‹(3way-handshakeå®Œäº†å¾Œã®acceptå¾…ã¡æŽ¥ç¶š) net.ipv4.tcp_tw_recycleã®åˆ¶é™ã«æŠµè§¦ ã§ã€ä»Šå›žå•é¡Œã«ãªã£ã¦ã„ãŸã®ã¯æœ€å¾Œã®tcp_tw_recycleã¸ã®æŠµè§¦ã ã£ãŸã€‚ ç¾è±¡ã¨ã—ã¦ç™ºç”Ÿã—ã†ã‚‹ã®ã¯ã€ä»¥ä¸‹ã®æ¡ä»¶ã‚’ã™ã¹ã¦æº€ãŸã™å ´åˆ ã‚µãƒ¼ãƒå´ã§net.ipv4.tcp_tw_recycleãŒæœ‰åŠ¹ TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ä½¿ç”¨ åŒä¸€IPã‹ã‚‰ã®æŽ¥ç¶šã§ã‚»ãƒƒã‚·ãƒ§ãƒ³ã‚’è·¨ãã¨ã‚»ãƒƒãƒˆã•ã‚Œã‚‹TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã®å€¤ãŒæˆ»ã‚‹å ´åˆãŒã‚ã‚‹ æœ€å¾Œã®æ¡ä»¶ãŒå¾®å¦™ã ãŒã€TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã®å€¤ã¨ã—ã¦ã‚»ãƒƒãƒˆã•ã‚Œã‚‹å€¤ã¯èµ·å‹•æ™‚ã‚’ èµ·ç®—æ™‚ã«ã—ã¦ã„ãŸã‚Šã¨å®Ÿè£…ã«ã‚ˆã£ã¦åˆæœŸå€¤
hiboma 2009/03/12
linux

tcp
ãƒªãƒ³ã‚¯
Linux: /proc/sys/net/ipv4/tcp_rmem ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ (ãƒ€ãƒ¡å‡ºã—æ—¥è¨˜)
hiboma 2007/08/31
/proc/sys/net/ipv4/tcp_rmem

tcp

network
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1