DNS ÁúÀÇ TimeOutÀÇ Áø½ÇÀº.. | ÀÛ¼ºÀÏ : 2010/11/03 20:14 |
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Ä¿ÇǴнº ä³Î irc ä³Î(http://coffeenix.net/bbs/viewtopic.php?p=1114#1114) ¿¡¼ sCag´ÔÀÌ DNS ¼¼¹Ì³ª¿¡¼ º¸´Ï "DNS ÁúÀÇ timeoutÀÌ µðÆúÆ® °ªÀÌ 5Ãʰ¡ ¾Æ´Ï¶ó ½ÇÁö·Î 1Ãʹ̸¸ÀÇ °á°ú"°¡ ³ª¿Ô´Ù ¶ó´Â ¸»ÀÇ ½ÃÃÊ·Î È®ÀÎÇØ º» »çÇ×ÀÔ´Ï´Ù. °ú¿¬ DNS ÁúÀÇ timeoutÀÌ µðÆúÆ®°¡ 5ÃÊ Àϱî¿ä? 1ÃÊ ¹Ì¸¸Àϱî¿ä? ÀÌ¿¡ Å×½ºÆ®¸¦ ÇØº¸¾Ò½À´Ï´Ù. 0. ±âº» Á¤º¸ - default °ªÀº /usr/include/resolv.h ÀÇ ÁöÁ¤ - RES_TIMEOUT 5 <-- /* min. seconds between retries */ <- 5ÃÊ? - RES_DFLRETRY 2 <-- /* Default #/tries. */ <-- 2¹ø? 1. Å×½ºÆ® ȯ°æ OS : Centos 4 µµ±¸ : dig, nslookup 2. Å×½ºÆ® ³»¿ª(dig, nslookup °¢°¢) 1) Primary Á¤»ó, Secondary Á¤»ó 2) Primary ºñÁ¤»ó, Secondary Á¤»ó 3) Primary Á¤»ó 4) Primary ºñÁ¤»ó 3. Å×½ºÆ® °á°ú 1) Primary Á¤»ó, Secondary Á¤»ó ========================================= # cat /etc/resolv.conf serarch xxxxxxxx.com nameserver 58.227.193.227 <-- Çϳª·Î ij½Ì? nameserver 164.124.101.2 <-- ÆÄ¿öÄÞ? # time dig www.naver.com °ÅµÎÀý¹Ì(Ưº°È÷ °á°ú¸¦ ÀûÁö ¾Ê°í ½Ã°£¸¸ ±âÀçÇÕ´Ï´Ù. ) real 0m0.006s user 0m0.002s sys 0m0.004s (primary dns¿¡¼ °¡Á®¿Â °ª) # time nslookup www.naver.com À̰͵µ °ÅµÎÀý¹Ì(ÇØº¸¸é ¾Æ½ÃÁÒ? Ưº°È÷ °á°ú¸¦ ÀûÀ» ÇÊ¿ä´Â..¤¾¤¾) real 0m0.005s user 0m0.000s sys 0m0.005s (primary dns¿¡¼ °¡Á®¿Â °ª) =========================================== ** µÑ´Ù Á¤»óÀûÀ¸·Î Àß °¡Á®¿É´Ï´Ù. ¹°·Ð Primary ¿¡ Á¤»óÀûÀ¸·Î °¡Á®¿Â °ÅÁÒ!! 2) Primary ºñÁ¤»ó, Secondary Á¤»ó ========================================= # cat /etc/resolv.conf serarch xxxxxxxx.com nameserver xxx.xxx.xxx.xxx <-- ¾Æ¹« IP³ª ¤¾¤¾; nameserver 164.124.101.2 <-- ÆÄ¿öÄÞ? # time dig www.naver.com °ÅµÎÀý¹ÌÇϰí real 0m1.010s user 0m0.000s sys 0m0.005s (secondary dns¿¡¼ °¡Á®¿Â °ª) # time nslookup www.naver.com °ÅµÎÀý¹Ì real 0m1.009s user 0m0.000s sys 0m0.004s (secondary dns¿¡¼ °¡Á®¿Â °ª) =========================================== ** 1ÃÊÀÇ Delay°¡ °É¸³´Ï´Ù. (¸î ¼ö½Ê¹ø ÇØºÁµµ µü 1ÃÊ delay°¡ °É¸³´Ï´Ù.) 3) Primary Á¤»ó(primary¸¸ ÁöÁ¤.) ========================================= # cat /etc/resolv.conf serarch xxxxxxxx.com nameserver 58.227.193.227 <-- Çϳª·Î ij½Ì ¼¹ö # time dig www.naver.com °ÅµÎÀý¹Ì real 0m0.006s user 0m0.003s sys 0m0.002s (primary dns¿¡¼ °¡Á®¿Â °ª) # time nslookup www.naver.com À̰͵µ °ÅµÎÀý¹Ì real 0m0.006s user 0m0.002s sys 0m0.003s (primary dns¿¡¼ °¡Á®¿Â °ª) =========================================== ** primary¿¡¼ Á¤»óÀûÀ¸·Î Àß °¡Á®¿É´Ï´Ù. 4) Primary ºñÁ¤»ó(primary ¸¸ ÁöÁ¤) ========================================= # cat /etc/resolv.conf serarch xxxxxxxx.com nameserver xxx.xxx.xxx.xxx <-- ¾Æ¹« IP³ª!! # time dig www.naver.com °ÅµÎÀý¹Ì real 0m15.010s user 0m0.001s sys 0m0.003s # time nslookup www.naver.com À̰͵µ °ÅµÎÀý¹Ì real 0m15.010s user 0m0.001s sys 0m0.003s =========================================== ** 15ÃÊ °É¸³´Ï´Ù. 15Ãʳª °É¸³´Ï´Ù. ¿Ö 15Ãʳª °É¸±±î¿ä..??? ÀÌ°Ç retry°¡ Àֱ⠶§¹®ÀÔ´Ï´Ù. ±â´Ù·È´Âµ¥ ¾È µÇ¾ú´Ù°í ÇÑ ¹ø¸¸ º¸³»´Â°ÍÀÌ ¾Æ´Ï¶ó ¸î ¹ø º¸³»´Â°ÍÀÌÁÒ. ÀÌ¿Í °ü·ÃÇØ¼´Â ½Ã°£ ³¯¶§ µû·Î ¿Ã·Á º¸°Ú½À´Ï´Ù. 4. °á·Ð °á·ÐÀº °£´Ü ÇÕ´Ï´Ù. dig, nslookupÀÇ °æ¿ì 1. secondary°¡ Á¸ÀçÇϸé Primary Äõ¸®ÀÇ °á°ú°¡ ¿À±â¸¦ 1Ãʸ¸ ±â´Ù¸®°í ¹Ù·Î secondary·Î Äõ¸® ¿äûÀ» ÇÕ´Ï´Ù. 2. secondary°¡ Á¸ÀçÇÏÁö ¾ÊÀ¸¸é? ¿ì¸®°¡ ÈçÈ÷ ¸»ÇÏ´Â Default °ª¿¡ Ãæ½ÇÇÕ´Ï´Ù. 5ÃÊ ¿Í retry ¼ö¿¡ µû¶ó º¯ÇÏ°Ô µÇ´Â °ÍÀÌÁÒ. °£´ÜÇÏÁÒ? ** DNS Äõ¸® TimeoutÀº »ç¿ëÇÏ´Â ¾îÇø®ÄÉÀ̼ǿ¡ ¿µÇâÀ» ¹Þ´Â´Ù´Â°É ±â¾ïÇÏ½Ã¸é µË´Ï´Ù. ´Ù¸¥ Åø¿¡¼´Â ´Ù¸£°Ô µ¿ÀÛÇÒ ¼ö ÀÖ½À´Ï´Ù. ±×·¯³ª, ´ëºÎºÐÀÇ ÅøÀº Primary DNSÀÇ ÀÀ´äÀ» 5ÃÊ ±â´Ù¸®°í retry ±îÁö ÇÏÁö´Â ¾Ê°ÚÁÒ?? Secondary°¡ Àִµ¥~~~ |
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