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C言語ã§ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ—ãƒã‚°ãƒ©ãƒ を実装ã™ã‚‹éš›ã®ãƒ¡ãƒ¢ã€‚動作環境ã¯Linuxç³»OSを対象ã¨ã—ã¦ã„る。 TCPã®keep-aliveオプション ソケットを開ãéš›ã«ã€TCPã®keep-aliveオプションをè¨å®šã™ã‚‹ã¨ã‚¢ã‚¤ãƒ‰ãƒ«çŠ¶æ…‹ãŒç¶šã„ãŸéš›ã«ã€ãƒ—ãƒãƒ¼ãƒ–パケットをé€å‡ºã—ã€é€šä¿¡ç›¸æ‰‹ã¨ã®æŽ¥ç¶šã‚’確èªã—ç¶æŒã—よã†ã¨ã™ã‚‹ã€‚逆ã«ãƒ—ãƒãƒ¼ãƒ–パケットã«ACKãŒå¸°ã£ã¦ã“ãªã„ã¨é€šä¿¡ç›¸æ‰‹ã¨ã®åˆ‡æ–を検出ã§ãã‚‹ã“ã¨ã¨ãªã‚‹ã€‚ デフォルトã§ã¯ã‚¢ã‚¤ãƒ‰ãƒ«çŠ¶æ…‹ãŒ7200秒=2時間経ãŸå¾Œã€ãƒ—ãƒãƒ¼ãƒ–パケットを75秒間隔ã§9回é€ä¿¡ã™ã‚‹ã€‚プãƒãƒ¼ãƒ–パケットã«å¯¾ã™ã‚‹ACKã®å¿œç”ãŒãªã„ã¨ã€é€šä¿¡ç›¸æ‰‹ãŒã„ãªããªã£ãŸã¨åˆ¤æ–ã—ã€ã‚¢ã‚¤ãƒ‰ãƒ«çŠ¶æ…‹ã®é€šä¿¡ã‚’終了ã™ã‚‹ã€‚ ã¤ã¾ã‚Šã€ã‚¢ã‚¤ãƒ‰ãƒ«çŠ¶æ…‹ã«å…¥ã£ã¦ã‹ã‚‰ã€7200秒＋75x9秒=7875秒 = 131.25秒 = 2時間11分経éŽã™ã‚‹ã¨é€šä¿¡ã‚’終了ã™ã‚‹ã€‚ãªãŠã€SO_KEEPALIVE ソケットオプションãŒæœ‰åŠ¹ã«ãªã£ã¦ã„ãªã„ã¨
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Post navigation ↠Previous Home > Web関連 > 開発 > Linux > Linuxカーãƒãƒ«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®ãƒ¡ãƒ¢ Linuxカーãƒãƒ«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®ãƒ¡ãƒ¢ サーãƒãƒ¼å‘ã‘ã«Linuxカーãƒãƒ«ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚’è¡Œã£ãŸéš›ã®ãƒ¡ãƒ¢ã§ã™ã€‚ è¨å®šå†…容 今回行ã£ãŸ /etc/sysctl.conf ã®è¨å®šå†…容ã¯æ›¸ãã®é€šã‚Šã§ã™ã€‚ å„パラメータã®èª¬æ˜Žã¯ã‚³ãƒ¡ãƒ³ãƒˆã¨ã—ã¦æ®‹ã—ã¦ãŠãã¾ã™ã€‚ # 共有メモリã®æœ€å¤§ã‚µã‚¤ã‚ºã€‚サーãƒãƒ¼ã®æ載メモリ(1GB)ã«åˆã‚ã›ã¦å¤‰æ›´ kernel.shmmax = 1073741824 # システム全体ã®å…±æœ‰ãƒ¡ãƒ¢ãƒªãƒ»ãƒšãƒ¼ã‚¸ã®æœ€å¤§æ•° kernel.shmall = 262144 # システム全体ã®ãƒ—ãƒã‚»ã‚¹æ•°ã®ä¸Šé™ kernel.threads-max = 1060863 # システム全体ã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã®ä¸Šé™ fs.file-max = 5242880
linux - how to check rx ring, max_backlog, and max_syn_backlog size - Unix & Linux Stack Exchange
Quite often in the course of troubleshooting and tuning things I find myself thinking about the following Linux kernel settings: net.core.netdev_max_backlog net.ipv4.tcp_max_syn_backlog net.core.somaxconn Other than fs.file-max, net.ipv4.ip_local_port_range, net.core.rmem_max, net.core.wmem_max, net.ipv4.tcp_rmem, and net.ipv4.tcp_wmem, they seems to be the important knobs to mess with when you ar
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Possible SYN flooding on port xxx. Sending cookies (Linux) - ben.goodacre.name/tech
$ dmesg ....... possible SYN flooding on port xxx. Sending cookies. possible SYN flooding on port xxx. Sending cookies. possible SYN flooding on port yyy. Sending cookies. possible SYN flooding on port yyy. Sending cookies. possible SYN flooding on port xxx. Sending cookies. possible SYN flooding on port xxx. Sending cookies. possible SYN flooding on port xxx. Sending cookies. Cause This could be
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is it possible to find out if a ruby socket is in state ESTABLISHED or CLOSE_WAIT without actually sending or reading data?
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