Linux Kernel Networking
Linux Kernel Networking takes you on a guided in-depth tour of the current Linux networking implementation and the theory behind it. Linux kernel networking is a complex topic, so the book won't burden you with topics not directly related to networking. This book will also not overload you with cumbersome line-by-line code walkthroughs not directly related to what you're searching for; you'll find
iptablesã§å„種DDoSã‹ã‚‰èº«ã‚’守る | 多脚.com
本日幼稚園å…以æ¥ã®é£Ÿã‚ãŸã‚Šã«ãªã‚Šã¾ã—ãŸã€‚ コドラã§ã‚‚ãªã‚“ã¨ã‚‚ãªã„ã®ã«ã€ãŠé…’ã®é£²ã¿éŽãŽä»¥å¤–ã§ã‚ラã‚ラã—ãŸã®ã¯ã‚‚ã®ã™ã”ã„ä¹…ã—ã¶ã‚Šã§ã™ã€‚ ã•ã¦æŠ€è¡“ã®ãªã•ã‚’客ã«è²¬ä»»è»¢å«ã—ã¦æŸãƒ›ã‚¹ãƒ†ã‚£ãƒ³ã‚°ä¼šç¤¾ãŒè©±é¡Œã«ãªã£ã¦ã„ã¾ã™ã。 ã“れ一番ã®å•é¡Œã¯è‡ªåˆ†ã®ãƒ›ã‚¹ãƒˆãŒDDoSã«ã‚ˆã£ã¦ç›´æŽ¥ãƒ€ã‚¦ãƒ³ã‚„フラッピングã—ã¦ã—ã¾ã†ã“ã¨ã§ã—ょã†ã€‚ 共用サーãƒãªã‚‰æ‰“ã¤æ‰‹ãªã—ã§ã™ãŒã€VPSや専用サーãƒã®å ´åˆã¯iptablesã§ã‚る程度自衛ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ å„社フィルタリングをã—ã¦ã„ã‚‹ã¨ç™ºè¡¨ã—ã¦ã„ã¾ã™ãŒã€å†…容を明ã‹ã›ãªã„ã®ã¯ã‚»ã‚ュリティ的ã—ã‹ãŸãªã„ã§ã™ã‚ˆã。 自社ã§ã¯DDoS対ç–ã«iptablesを使ã£ã¦ã„ã‚‹ã¨ã„ã†ã“ã¨ã‚‚ã‚ã‚Šã€å¯èƒ½ãªç¯„囲ã§æ‰‹æ³•ã‚’公開ã—よã†ã¨æ€ã„ã¾ã™ã€‚ 方法ã¨ã—ã¦ã¯iptablesã®hashtablesを使ã„ã¾ã™ã€‚ iptablesã¯ãƒ•ãƒ©ã‚°ã‚„ステータスã€srcIPã‚„dstIPãªã©æ¡ä»¶ã‚’ç´°ã‹ãã—ã¦ãƒãƒƒã‚·ãƒ¥ãƒ†ãƒ¼ãƒ–ルを作るã“ã¨ãŒ
How TCP backlog works in Linux
When an application puts a socket into LISTEN state using the listen syscall, it needs to specify a backlog for that socket. The backlog is usually described as the limit for the queue of incoming connections. Because of the 3-way handshake used by TCP, an incoming connection goes through an intermediate state SYN RECEIVED before it reaches the ESTABLISHED state and can be returned by the accept s
Stray Penguin - Linux Memo (PXE Install)
RedHat Enterprise Linux (RHEL) ã‚„ Fedora Core ã‚’ã€CDを使ã‚ãšãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ–ートã§ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã™ã‚‹æ–¹æ³•ã€‚ã“ã‚Œã¾ã§ã¯ dhcpd, pxe, tftpd, httpd を個別ã«è¨å®šã™ã‚‹å¿…è¦ãŒã‚ã£ãŸãŒã€ Cobbler (コブラー ※) ã¨ã„ã†ãƒ¦ãƒ¼ãƒ†ã‚£ãƒªãƒ†ã‚£ãƒ‘ッケージãŒç¾ã‚Œã¦ã€ã‹ãªã‚Šç°¡å˜ã«é…布サーãƒã‚’構築ã§ãるよã†ã«ãªã£ãŸã€‚ãªãŠã€Cobbler ã«ã¯ã€Yum ã‚„ Up2date 用ã®ãƒãƒ¼ã‚«ãƒ«ãƒ¬ãƒã‚¸ãƒˆãƒªã‚’作æˆ/æ›´æ–°ã™ã‚‹æ©Ÿèƒ½ã‚„ã€ãƒ‡ã‚£ã‚¹ã‚¯ãƒ¬ã‚¹ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã®ã‚¤ãƒ¡ãƒ¼ã‚¸ã‚µãƒ¼ãƒã‚’構築ã™ã‚‹æ©Ÿèƒ½ã‚‚ã‚る。ã“ã“ã§ã‚‚ã€ãã®ç‰‡é±—ã¨ã—ã¦ã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚’レスã‚ューモードã§ç«‹ã¡ä¸Šã’ã‚‹ãŸã‚ã®è¨å®šã‚‚網羅ã™ã‚‹ã€‚ PXEブートã®ä»•çµ„ã¿ã«ã¤ã„ã¦ã¯ã©ã‚“ã©ã‚“他力ã«é ¼ã£ã¦ã—ã¾ã†ï¼› PXEを使ã£ã¦PCもディスクレスã«ã—よã†ï¼ 謎ã®å‡¦ç†ç³» SunOS 4.1.4 ※ `cobbler' ã¯ã‚ã®é ã®å¹³ãŸã„
ntop
Today we report how ntopng has been used by Alabus AG to improve the corporate security (German version down this page). Enjoy ! PS. ntop users are very welcome to contact us reporting how they use ntop tools. ntop is used as a basis for analyzing the entire network traffic and it generates a very […] Next year the ntop community will meet in Zürich, Switzerland for a two days event (training and
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å‰å›žã¾ã§ã¯mod_proxy_balancerã§ä¸ã€œå¤§è¦æ¨¡ã‚µãƒ¼ãƒãƒ¼ã‚’é‹ç”¨ã™ã‚‹ã¨ãã®å‹˜æ‰€ã‚’ãŠè©±ã—ã—ã¦ãã¾ã—ãŸã€‚ ã“れ以外ã«ã‚‚mod_proxy_balancerãªä¸ã€œå¤§è¦æ¨¡ã‚µãƒ¼ãƒãƒ¼ã§æ°—ã‚’ã¤ã‘ã‚‹ã¹ã点ã¯ã‚ã‚Šã¾ã™ã€‚ãã‚ŒãŒiptablesã¨ip_conntrack。 外部ã«ç›´æŽ¥æ™’ã•ã‚Œã¦ã„るサーãƒãƒ¼ã¯ã‚»ã‚ュリティーを確ä¿ã™ã‚‹ãŸã‚ã«iptablesãªã©ã®ãƒ•ã‚¡ã‚¤ãƒ¤ã‚¦ã‚©ãƒ¼ãƒ«ã‚’å°Žå…¥ã—ã¦ã„ã‚‹ã‹ã¨æ€ã„ã¾ã™ã€‚アクセス数ãŒã‚る程度以上ã«ãªã£ã¦ãã‚‹ã¨ã€ãã®ãƒ•ã‚¡ã‚¤ãƒ¤ã‚¦ã‚©ãƒ¼ãƒ«ãŒæ€ã‚ã¬è¶³ã‹ã›ã«ãªã£ã¦ã—ã¾ã†ã¨è¨€ã†ãŠè©±ã§ã™ã€‚ iptablesã¯ãƒ‘ケットフィルタリングを行ã†ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã§ã™ã€‚PCã«å…¥ã£ã¦ããŸã‚Šã€é€†ã«PCã‹ã‚‰å‡ºã¦è¡Œãパケットを監視ã—ã€ãƒ«ãƒ¼ãƒ«ã«å¾“ã„é©å®œãƒ•ã‚£ãƒ«ã‚¿ãƒªãƒ³ã‚°ã‚’è¡Œã„ã¾ã™ã€‚ ã•ã¦ã€iptablesã§ã¯ã€é–¢é€£ã—ãŸãƒ‘ケットを追跡ã™ã‚‹ãŸã‚ã«/proc/net/ip_conntrackã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«ã‚’作りã€ãƒ‘ケットã®æƒ…å ±
ボンディング
図1　ボンディングã®æ¦‚念図。複数ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ»ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ãƒ»ã‚«ãƒ¼ãƒ‰ï¼ˆNIC）をæ載ã—，ãれらã®NICを一ã¤ã®ä»®æƒ³çš„ãªNICã¨ã—ã¦æ‰±ã„ã¾ã™ã€‚ 1å°ã®ãƒžã‚·ãƒ³ã«è¤‡æ•°ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ»ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ãƒ»ã‚«ãƒ¼ãƒ‰ï¼ˆNIC）をæ載ã—，ãれらã®NICを一ã¤ã®ä»®æƒ³çš„ãªNICã¨ã—ã¦æ‰±ã†ãŸã‚ã®æŠ€è¡“ã§ã™ï¼ˆå›³1）。「ãƒãƒ¼ãƒŸãƒ³ã‚°ã€ï¼ˆTeaming）ã¨ã‚‚呼ã°ã‚Œã¾ã™ã€‚ ボンディングã¯ï¼Œãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®è² è·ã‚’分散ã•ã›ãŸã‚Šï¼Œã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã‚„ä¿¡é ¼æ€§ã‚’å‘上ã•ã›ãŸã‚Šã™ã‚‹å ´åˆã«ç”¨ã„られã¾ã™ã€‚例ãˆã°ï¼Œãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã«ã‚ˆã‚Š2ã¤ã®NICã§é€šä¿¡ã™ã‚Œã°ï¼Œ1ã¤ã®NICã§é€šä¿¡ã™ã‚‹ã‚ˆã‚Šã‚‚ç†è«–上2å€ã®ãƒ‡ãƒ¼ã‚¿ã‚’é€å—ä¿¡ã§ãã¾ã™ã€‚ã¾ãŸï¼Œè¤‡æ•°ã®NICã§å¤šé‡åŒ–ã™ã‚Œã°ï¼Œãã®ã†ã¡ã®1ã¤ã®NICã«éšœå®³ãŒç™ºç”Ÿã—ãŸå ´åˆã§ã‚‚æ£å¸¸ãªNICã«ã‚ˆã‚Šé€šä¿¡ã‚’継続ã§ãã¾ã™ã€‚ ã“ã®ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã‚’実ç¾ã™ã‚‹æ©Ÿèƒ½ã¯ï¼ŒLinuxカーãƒãƒ«ã®æ¨™æº–ドライãƒï¼ˆãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ãƒ»ãƒ‰ãƒ©ã‚¤ãƒï¼‰ã¨ã—ã¦å®Ÿè£…ã•ã‚Œã¦ã„ã¾ã™ã€‚
Linux Virtual Server Tutorial
Horms（Simon Horman） - horms@valinux.co.jp VA Linux Systems Japanæ ªå¼ä¼šç¤¾ - www.valinux.co.jp 2003å¹´7月（2004å¹´3月改訂） http://www.ultramonkey.org/ Linux Virtual Server（LVS）プãƒã‚¸ã‚§ã‚¯ãƒˆã¯ã€ãƒ¬ã‚¤ãƒ¤4スイッãƒãƒ³ã‚°ã‚’利用ã—ã¦ã€Webサーãƒã‚„メールサーãƒãªã©ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ»ã‚µãƒ¼ãƒ“スã®è² è·åˆ†æ•£ã‚’å¯èƒ½ã«ã—ã¾ã™ã€‚ã“ã‚Œã¯éžå¸¸ã«é«˜é€Ÿã§ã€ã“れらã®ã‚µãƒ¼ãƒ“スã¯ã€æ•°ä¸‡ã‹ã‚‰æ•°å万もã®åŒæ™‚接続ã«ã¾ã§æ‹¡å¼µã—ã¦ã‚µãƒ¼ãƒ“スをæä¾›ã§ãるよã†ã«ãªã‚Šã¾ã™ã€‚ ã“ã®ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã®ç›®çš„ã¯ã€LVSã®ã•ã¾ã–ã¾ãªæ©Ÿèƒ½ã‚’利用ã—ã¦ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆãƒ»ã‚µãƒ¼ãƒ“スã®è² è·åˆ†æ•£ã‚’è¡Œã†æ–¹æ³•ã¨ã€heartbeatã‚„keepalivedãªã©ã®ãƒ„ールを使ã£ã¦é«˜å¯ç”¨æ€§ã‚’実ç¾ã™ã‚‹æ–¹æ³•ã‚’示ã™ã“ã¨ã§ã™ã€‚ã•ã‚‰ã«ã€é«˜å¯ç”¨æ€§ç’°å¢ƒã§ã‚¢ã‚¯
ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å›³ç”Ÿæˆãƒ„ール nwdiag — blockdiag 1.0 ドã‚ュメント
ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å›³ç”Ÿæˆãƒ„ール nwdiag¶ nwdiag generates network-diagram images from .diag files (similar to graphviz's DOT files). You can get diagrams like this: ã¾ãŸã€nwdiag 㯠rackdiag 〠packetdiag ã¨ã„ã†ãµãŸã¤ã®ã‚¹ã‚¯ãƒªãƒ—トをåŒæ¢±ã—ã¦ã„ã¾ã™ã€‚ rackdiag ã¯ãƒ©ãƒƒã‚¯å›³ã‚’生æˆã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚
NfSen
NfSen - Netflow Sensor What is NfSen? NfSen is a graphical web based front end for the nfdump netflow tools. NfSen allows you to: Display your netflow data: Flows, Packets and Bytes using RRD (Round Robin Database). Easily navigate through the netflow data. Process the netflow data within the specified time span. Create history as well as continuous profiles. Set alerts, based on various condition
Vyatta - Welcome to the Dawn of Open-Source Networking
Vyatta is working to restore the open environment and culture of the Internet's past by developing a line of enterprise-grade, open-source, network infrastructure products, including routers and firewalls. The Vyatta OFR provides an open-source alternative to proprietary, closed-source routing products.Vyatta - Open Networking Solutions Are you frustrated with network appliances that box you in a
NFDUMP
*** This project moved to Github.*** The documentation below is for legacy purpose only This is a small description, what the nfdump tools do and how they work. Nfdump is distributed under the BSD license - see BSD-license.txt - and can be downloaded at https://github.com/phaag/nfdump The nfdump tools collect and process netflow data on the command line. They are part of the NfSen project which is
Facebook主導ã®Open Compute Projectã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯æŠ€è¡“ã®ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã‚’ç«‹ã¡ä¸Šã’
Facebook主導ã®Open Compute Projectã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯æŠ€è¡“ã®ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã‚’ç«‹ã¡ä¸Šã’ ç±³Facebook主導ã®ãƒ‡ãƒ¼ã‚¿ã‚»ãƒ³ã‚¿ãƒ¼æŠ€è¡“ã®ã‚ªãƒ¼ãƒ—ンソース化プãƒã‚¸ã‚§ã‚¯ãƒˆã€ŒOpen Compute Project（OCP）ã€ã¯5月8日（ç¾åœ°æ™‚間）ã€ã‚ªãƒ¼ãƒ—ンã§ãƒ—ラットフォームをå•ã‚ãªã„トップオブラックスイッãƒã®ãŸã‚ã®ä»•æ§˜ã‚’開発ã™ã‚‹ãŸã‚ã®æ–°ãŸãªãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã‚’ç«‹ã¡ä¸Šã’ãŸã¨ç™ºè¡¨ã—ãŸã€‚ OCPã¯ã€FacebookãŒ2011å¹´4月ã«è‡ªç¤¾ã®ã‚µãƒ¼ãƒã¨ãƒ‡ãƒ¼ã‚¿ã‚»ãƒ³ã‚¿ãƒ¼ã®è¨è¨ˆä»•æ§˜ã‚’オープンソース化ã—ã¦ç™ºè¶³ã•ã›ãŸãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã€‚ã“ã‚Œã¾ã§ã«ãƒ©ãƒƒã‚¯ã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã€ãƒžã‚¶ãƒ¼ãƒœãƒ¼ãƒ‰ãªã©ã®ã‚ªãƒ¼ãƒ—ンãªè¨è¨ˆã‚’公開ã—ã¦ãŠã‚Šã€ç±³Intelã€ç±³AMDã€ç±³Rackspaceã€æ—¥ç«‹ã€NTTデータをã¯ã˜ã‚ã¨ã™ã‚‹50社以上ãŒå‚åŠ ã—ã¦ã„る。 Facebookã®ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢è¨è¨ˆãŠã‚ˆã³ã‚µãƒ—ライãƒã‚§ãƒ¼ãƒ³æ‹…当副社長ã§ã€OCPã®ä¼šé•·ã‚’å‹™ã‚るフランク・
TUN/TAP - Wikipedia
This article is about the network tunnel driver. For the software unit testing protocol known as TAP, see Test Anything Protocol. This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable so
Google works on Internet standards with TCP proposals, SPDY standardization
As part of Google's continuing quest to dole out Web pages ever more quickly, the search giant has proposed a number of changes to Transmission Control Protocol (TCP), the ubiquitous Internet protocol used to reliably deliver HTTP and HTTPS data (and much more besides) over the 'net. Google's focus is on reducing latency between client machines and servers, and in particular, reducing the number o
net-snmpã«ã¤ã„ã¦ï¼ˆåŸºç¤ŽçŸ¥è˜ï¼‰
SNMPã¨ã¯ æ—¢ã«SNMPã‚’ã”å˜çŸ¥ã®æ–¹ã‚‚多ã„ã¨æ€ã„ã¾ã™ã€‚「Simple Network Management Protocolã€ã®ç•¥ã§ã™ã€‚SNMPãŒä¸–ã«ç¾ã‚Œã¦ç´„20å¹´ã»ã©çµŒã¡ã¾ã—ãŸã€‚ç¾åœ¨ã§ã¯ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆæ¨™æº–プãƒãƒˆã‚³ãƒ«ã§ã‚ã‚Šã€åºƒã知られãŸç®¡ç†ç³»ãƒ—ãƒãƒˆã‚³ãƒ«ã§ã™ã€‚ ドã‚ュメントãŒå°‘ãªãã€ä»•æ§˜ã®è¤‡é›‘ãªSNMP ã—ã‹ã—ãã®åå‰ã¨ã¯è£è…¹ã«ã€åˆ©ç”¨æ–¹æ³•ã«ãŠã„ã¦ã‚‚管ç†ãƒ»ç›£è¦–方法もã€æ±ºã—ã¦ã€ŒSimpleã€ã§ã¯ã‚ã‚Šã¾ã›ã‚“。他ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã¨é•ã„ã€ç•°ãªã‚‹ãƒãƒ¼ã‚¸ãƒ§ãƒ³åŒå£«ã§ã‚‚å‹•ãよã†ã«å®Ÿè£…ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã—ã€å€‹äººçš„ãªçµŒé¨“ã§ã¯ã€SNMPã®ç‰¹ã«ã‚¨ãƒ¼ã‚¸ã‚§ãƒ³ãƒˆã®æ‹¡å¼µæ–¹æ³•ã«é–¢ã™ã‚‹æƒ…å ±ã¯ãƒãƒƒãƒˆä¸Šã§ã‚‚ã‚ã¾ã‚Šè¦‹å½“ãŸã‚Šã¾ã›ã‚“。ã“ã‚Œã¯SNMPã®ä»•æ§˜ã®æ‹¡å¼µã•ã‚ŒãŸçµŒç·¯ãŒè¤‡é›‘ã§ã‚ã‚‹ãŸã‚ã§ã™ã€‚必然的ã«RFCã§ã‚‚散文化ã•ã‚Œã¦ãŠã‚Šã€ãã®ä»•æ§˜è‡ªä½“ã‚‚ã‹ãªã‚Šè¤‡é›‘ã§ã™ã€‚ ãã‚“ãªSNMPã«ã¤ã„ã¦ã€ç§ã¯ç¸ã‚ã£ã¦SNMPã«è§¦ã‚Œã‚‹æ©Ÿä¼šã«å¤šå°‘æµã¾ã‚Œã¦èª¿æŸ»ã—ã¾ã—ãŸã€‚
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IPv6 対応アプリケーション開発ãªã‚“ã¦æ€–ããªã„
This document discusses IPv6 and how to support it on web servers and other internet services. It covers: - The basics of IPv6 addressing and how it differs from IPv4 with a larger 128-bit address size. - Challenges of the IPv4 address exhaustion and transition to IPv6. - Configuring web servers, proxies, DNS, and mail servers to support IPv6.Read less
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http://bulk.fefe.de/scalable-networking.pdf
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