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                                            192.10.10.1         192.10.10.2


   * DNS Æ°ºî¤Î»ÅÁÈ¤ß 
    
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                 |      |
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           |  |hostY| DNS£²¼¡   |  |hostZ| DNS£±¼¡
           |  -------           |  -------
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       -------------        ---------------- 202.241.128.0
        henomohe.or.jp           nix.co.jp   ¼«¥µ¥¤¥È¤Î¥É¥á¥¤¥ó


    [ hostX ¤Ç¤Î DNS ¤Îµ­½Ò ]  JPNIC ¤Î¥Í¡Ý¥à¥µ¡Ý¥Ð

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        |   |
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        |hostZ.nix.co.jp.   IN A 202.241.128.1

        /etc/named.rev
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        |@ IN SOA ....
        |   |
        |128.241.202.in-addr.arpa. IN NS hostZ.nix.co.jp.   << µÕ°ú¤­¾ðÊó¤Îµ­½Ò¡£


    [ hostY ¤Ç¤Î DNS ¤Îµ­½Ò ]

        /etc/named.boot             
        -------------------------------------------   
        |   | ¤³¤³¤Ï henomohe.or.jp ¼«ÂÎ              Ê̤ˤɤó¤Ê¥Õ¥¡¥¤¥ë̾¤Ç¤â¤¤¤¤¡£
        |   | ¤Î named.boot ¤ÎÀßÄê¤òµ­½Ò              ¥Ç¥£¥ì¥¯¥È¥ê»ØÄê¤òÆþ¤ì¤Æ¤â¤¤¤¤¡£             
        |                                                          ¢­
        |secondary  nix.co.jp                 202.241.128.1  named.hosts.sec
        |secondary  128.241.202.in-addr.arpa  202.241.128.1  /bak/named.rev.sec


    [ hostZ ¤Ç¤Î DNS ¤Îµ­½Ò ]

        /etc/named.boot
        -------------------------------------------------------
        |cache      .                          /etc/named.ca
        |primary    nix.co.jp                  /etc/named.hosts
        |primary    128.241.202.in-addr.arpa   /etc/named.rev
        |primary    0.0.127.in-addr.arpa       /etc/named.local

        nix.co.jp ¥É¥á¥¤¥ó¤Î¥Û¥¹¥È̾¤Î¾ðÊó¤È¡¢202.241.128.0 ¥Í¥Ã¥È¥ï¡Ý¥¯¤Î£É£Ð¥¢¥É¥ì
        ¥¹¤Î¾ðÊó¤ò¤³¤Î DNS ¤Ï´ÉÍý¤·¤Æ¤¤¤ë¡£¾å°Ì¤Î¥É¥á¥¤¥ó¡¢¤Ä¤Þ¤ê co.jp ¥É¥á¥¤¥ó¤«¤é
        ´ÉÍý¤Î¸¢¸Â¤ò°Ñ¾ù¤µ¤ì¤Æ¤¤¤ë¤È¤¤¤¦¡£nix.co.jp ¥É¥á¥¤¥ó¡¢202.241.128.0 £É£Ð¥¢¥É
        ¥ì¥¹¤Î Authorized ¤µ¤ì¤¿¥¾¡Ý¥ó¾ðÊó¤ò»ý¤Ã¤Æ¤¤¤ë¤È¤¤¤Ã¤¿¸À¤¤Êý¤ò¤¹¤ë¡£named.ca 
        ¤Ï¥¤¥ó¥¿¡Ý¥Í¥Ã¥È¤Î¥ë¡Ý¥È¥­¥ã¥Ã¥·¥å¤Î¥Õ¥¡¥¤¥ë¤ò»È¤¦¡£


   * ¥¾¡Ý¥óžÁ÷¤ÎÀ©¸Â

    £±¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤Î named.boot ¥Õ¥¡¥¤¥ë¤Ë¤ª¤¤¤Æ¡¢£²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤Ø¤Î¥¾¡Ý¥óžÁ÷¤ò
    À©¸Â¤¹¤ë¥ª¥×¥·¥ç¥ó¤¬¡¢BIND 4.9.7 ¤ÇÄɲ䵤줿¤è¤¦¤Ç¤¢¤ë¡£ man ¥Þ¥Ë¥å¥¢¥ë¤ò¸«¤ë¤È¡¢
    ¤½¤Î¤è¤¦¤Ê¤³¤È¤¬¹µ¤¨¤á¤Ë½ñ¤«¤ì¤Æ¤¢¤Ã¤¿¡£Â¾¤Ë¤â limit ¤È¤« check-names ¤È¤«¸«¤¿¤³
    ¤È¤Ê¤¤¥ª¥×¥·¥ç¥ó¤â½ñ¤«¤ì¤Æ¤¢¤Ã¤¿¡£¤·¤«¤· BIND 4.9.7 ¤Ï BIND 4 ·ÏÎó¤Ç¤ÏºÇ¸å¤Ç¤¢¤ê¡¢
    ¤â¤¦ BIND 4 ·ÏÎó ¤Î named ¤Î»ÈÍѤϤä¤á¡¢BIND 8 ·ÏÎó¤ò»È¤¦¤Ù¤­¤Ç¤¢¤í¤¦¡£

        named.boot                                            
        -------------------------------------------------------
        |xfrnets  £²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤Î£É£Ð¥¢¥É¥ì¥¹&¥Í¥Ã¥È¥Þ¥¹¥¯
        |;xfrnets 127.0.0.1&255.255.255.255    ¤É¤³¤«¤é¤â¥À¥á

    Ãí.£±£¹£¹£¹Ç¯£´·î JPNIC ¤Ï´ÉÍý¤¹¤ë£Ä£Î£Ó¤Î¥¾¡Ý¥óžÁ÷¤ÎÀ©¸Â¤ò¼Â»Ü¤¹¤ë¤È¥¢¥Ê¥¦¥ó¥¹
       ¤·¤¿¡£JPNIC¤Ï¤½¤ìÆȼ«¤Ç£Ä£Î£Ó¤ò´ÉÍý¤·¤Æ¤¤¤ë¤Î¤À¤«¤é¡¢Â¾¤Ë£²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤òΩ
       ¤Æ¤Æ¤â¤é¤¦¤³¤È¤Ï¤Ê¤¤¤·¡¢Âè»°¼Ô¤Ë¥¾¡Ý¥ó¾ðÊó¤ò¸«¤Æ¤â¤é¤¦É¬Íפâ¤Ê¤¤¡£ ¤³¤Î¤³¤È¤Ï
       JPNIC ¤Î¥Í¡Ý¥à¥µ¡Ý¥Ð¤Ë¸Â¤é¤º¡¢ ²æ¡¹¤¬´ÉÍý¤¹¤ëËöü¤Î¥Í¡Ý¥à¥µ¡Ý¥Ð¤Ç¤âƱ¤¸¤³¤È¤¬
       ¤¤¤¨¤ë¡£¥¤¥ó¥¿¡Ý¥Í¥Ã¥È¤Î´í¸±À­¤«¤é¿È¤ò¼é¤ë¤¿¤á¤Ë¤Ï¡¢ ɬÍ׺ÇÄã¸Â¤Î¾ðÊó¤·¤«³°¤Ë
       ½Ð¤µ¤Ê¤¤¤è¤¦¤Ë¤·¤¿Êý¤¬ÌµÆñ¤Ç¤¢¤ë¡£


  (3) DNS ¥É¥á¥¤¥ó¤Î³¬Áع½Â¤  '96

   * ¥É¥á¥¤¥ó¤Î³¬Áع½Â¤¤Î´ðËÜ

    ¥É¥á¥¤¥ó¤¬³¬Áع½Â¤¤ò¤È¤ê¡¢¥µ¥Ö¥É¥á¥¤¥ó¤ò¤â¤Ä¾ì¹ç¡¢¿Æ¥É¥á¥¤¥ó¤Ï¥µ¥Ö¥É¥á¥¤¥ó¤Î¥Û¥¹
    ¥È̾¤Î¸¡º÷¤ÎÁë¸ý¤Ë¤Ê¤ë¡£¿Æ¥É¥á¥¤¥ó¤Ï¥µ¥Ö¥É¥á¥¤¥ó¤Ë¤Ä¤¤¤Æ¤Ï¡¢¤É¤³¤½¤³¤Ëʹ¤¤¤Æ¤¯¤ì
    ¤È¤¤¤¦¾ðÊó¤ò¤â¤¿¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£¤³¤ì¤Ï named.hosts ¤Ë½ñ¤¯¤³¤È¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡£

        hostA ¤Î named.hosts     
        -------------------------
        |a.    IN NS   hostA.a.     << ¼«¥É¥á¥¤¥ó¤Î£±¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¡£
        |b.a.  IN NS   hostB.b.a.   << ¥µ¥Ö¥É¥á¥¤¥ó¤Î£±¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¡£

                                    
            -------                       named.boot                 
            |hostA| a ¤Î£±¼¡              -------------------------- 
            -------                       |primary  a  named.hosts     
               |             
          --------------------- a 
                   |  -------             named.boot               
                   |  |hostB| b.a ¤Î£±¼¡  --------------------------  
                   |  -------             |primary  b.a  named.hosts   
                   |     |
            ------------------- b.a
    
    
   * £²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤¬¤¢¤ë¾ì¹ç

        hostB ¤Î named.hosts
        ---------------------------------------
        |b.a.   IN NS  hostB.b.a.   << ¼«¥É¥á¥¤¥ó¤Î£±¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð
        |       IN NS  hostA.a.     << ¼«¥É¥á¥¤¥ó¤Î£²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð
        |
        |c.b.a. IN NS  hostC.c.b.a. << ²¼°Ì¥É¥á¥¤¥ó¤Î£±¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð
        |       IN NS  hostB.b.a.   << ²¼°Ì¥É¥á¥¤¥ó¤Î£²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð

                                     
        -------                           named.boot    a ¤Î£±¼¡¤Ï¾¤Ë¤¢¤ë¤È¤¹¤ë
        |hostA| b.a ¤Î£²¼¡                ---------------------------------
        -------                           |secondary  b.a  named.hosts.sec
           |    
        --------------------- a
             |                            named.boot                 
             |  -------                   ---------------------------------  
             |  |hostB| b.a   ¤Î£±¼¡      |primary b.a named.hosts   
             |  ------- c.b.a ¤Î£²¼¡      |secondary c.b.a  named.hosts.sec
             |     |             
          ------------------- b.a 
               |                          named.boot               
               |   -------                ---------------------------------   
               |   |hostC| c.b.a ¤Î£±¼¡   |primary c.b.a named.hosts 
               |   -------                                        
               |      |
            ----------------- c.b.a


   * ¥Û¥¹¥È̾¸¡º÷¤ÎÎã


Fig. d21

   * ¥µ¥Ö¥É¥á¥¤¥ó¤È¼ç¥É¥á¥¤¥ó¤Î´Ø·¸

    ¥Û¥¹¥È£Á¡¢£Â¤Ç¤Ï¼«¥É¥á¥¤¥ó¤Î¤ß´ÉÍý¤¹¤ë DNS ¤¬Æ¯¤¤¤Æ¤¤¤ë¤È¤¹¤ë¡£b.a  ¤Î¥µ¥Ö¥É¥á¥¤
    ¥ó¤¬ a ¥É¥á¥¤¥ó¤Î¥Û¥¹¥È¤òǧ¼±¤¹¤ë¤¿¤á¤Ë¤Ï¡¢¥Û¥¹¥È£Â¤Ç¤É¤Î¤è¤¦¤Ë DNS ¤òÀßÄꤹ¤ì¤Ð
    ¤¤¤¤¤«¡£


            ------  ¤³¤³¤Ç¤Ï b.a ¤òǧ¼±¤Ç¤­¤ë¤è¤¦
            | £Á |  named.hosts ¤Ë NS £Â ¤òÆþ¤ì¤Æ
            ------  ¤¢¤ë¤â¤Î¤È¤¹¤ë¡£
               |                            ====================================
          --------------------- a           ¥Õ¥¡¥¤¥¢¥¦¥©¡Ý¥ë¤ä¥»¥­¥å¥ê¥Æ¥£¤Î´Ø·¸
                   |  ------                ¤«¤é¿§¡¹¤ÊÊýË¡¤¬¤È¤é¤ì¤ë¤³¤È¤Ë¤Ê¤ë¡£
                   |  | £Â |                ====================================
                   |  ------
                   |     |
            ------------------- b.a

      1. ¥ë¡Ý¥È¥­¥ã¥Ã¥·¥å¤ò a ¥É¥á¥¤¥ó¤Ë¤¹¤ë¡£<< DNS ¤ÎÀß·×»×ÁÛ¤«¤é¤¹¤ì¤Ð¥³¥ì¤¬ÂÅÅö¡£
      2. named.hosts ¤Ë NS £Á ¤òÆþ¤ì¤ë¡£
      3. /etc/resolv.conf ¤Ë nameserver £Á ¤òÆþ¤ì¤ë¡£
      4. £Á¤Î£²¼¡¥Í¡Ý¥à¥µ¡Ý¥Ð¤Ë¤Ê¤ë¡£
      5. £Á¤ò forward »ØÄꤹ¤ë¡£


  (4) DNS ´ÉÍý¥¾¡Ý¥ó¤ÎÈÏ°Ï

   * ñ°ì¥É¥á¥¤¥ó¤Ç¥¾¡Ý¥ó¤Î´ÉÍý¤ò°Ñ¾ù¤·¤Ê¤¤¾ì¹ç¤Î´ðËÜ

          named A ¢£    B ¢¢                                ¥Û¥¹¥È£Á¤Î DNS ¤¬¥Û¥¹¥È
                  ¡Ã.1    ¡Ã.2                              £Á,£Â,£Ã,£Ä¤Î¥¾¡Ý¥ó¾ðÊó
        ------------------------- 192.9.200.0  nix.co.jp    ¤ò´ÉÍý¤¹¤ë¡£
            ¡Ã                          
            ¢¢  C ¢¢    D ¢¢     
            ¡Ã    ¡Ã3.    ¡Ã.4
        ------------------------- 192.9.201.0  nix.co.jp  

    /etc/named.boot
    ------------------------------------------------------
    |cache      .                       /etc/named.ca
    |primary    nix.co.jp               /etc/named.hosts
    |primary    200.9.192.in-addr.arp   /etc/named.rev0
    |primary    201.9.192.in-addr.arp   /etc/named.rev1
    |primary    127.in-addr.arpa        /etc/named.local    

    /etc/named.hosts
    --------------------------------------------------------------
    |@          IN  SOA hostA.nix.co.jp. katou.hostA.nix.co.jp. (
    |                   1 3600 300 3600000 360000 )
    |           IN  NS  hostA.nix.co.jp.
    |localhost. IN  A  127.0.0.1
    |hostA      IN  A  192.9.200.1
    |hostB      IN  A  192.9.200.2          
    |hostC      IN  A  192.9.201.3
    |hostD      IN  A  192.9.201.4

    /etc/named.rev0                         /etc/named.rev1
    -------------------------------------   -------------------------------------
    |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸                     |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸
    |           IN  NS  hostA.nix.co.jp.    |           IN  NS  hostA.nix.co.jp.
    |1          IN  PTR hostA.nix.co.jp.    |3          IN  PTR hostC.nix.co.jp.
    |2          IN  PTR hostB.nix.co.jp.    |4          IN  PTR hostD.nix.co.jp.      
                                               
    /etc/named.local
    -------------------------------------
    |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸
    |           IN  NS  hostA.nix.co.jp.
    |$ORIGIN    127.in-addr.arpa.
    |1.0.0      IN  PTR localhost.nix.co.jp.

    /etc/named.ca   ¥í¡Ý¥«¥ë¤Î¥Í¥Ã¥È¥ï¡Ý¥¯Æâ¤Ç¤Î¤ß»È¤¨¤ë¥ë¡Ý¥È¤Î¥É¥á¥¤¥ó¾ðÊó
    --------------------------------------------------
    |.                9999999 IN NS   hostA.nix.co.jp.  ¥É¥á¥¤¥ó¤Î¥ë¡Ý¥È¤¬ nix.co.jp
    |hostA.nix.co.jp. 9999999 IN A    192.9.200.1       ¤È¤¤¤¦¤³¤È¤Ç¤¢¤ë¡£


    [ ¥¤¥ó¥¿¡Ý¥Í¥Ã¥È¤ÈÀܳ¤¹¤ë¾ì¹ç¤Î¾å°Ì¥É¥á¥¤¥ó¤Ç¤ÎÅÐÏ¿ ]

    /etc/named.hosts                            /etc/named.ca ¤Ï¥¤¥ó¥¿¡Ý¥Í¥Ã¥ÈÍѤÎ
    -----------------------------------------   ¥ë¡Ý¥È¥­¥ã¥Ã¥·¥å¡¦¥Õ¥¡¥¤¥ë¤ò»È¤¦¡£
    |nix.co.jp.       IN NS hostA.nix.co.jp.  
    |hostA.nix.co.jp. IN A  192.9.200.1      

    /etc/named.rev
    ------------------------------------------------
    |200.9.192.in-addr.arpa  IN NS hostA.nix.co.jp. 
    |201.9.192.in-addr.arpa  IN NS hostA.nix.co.jp. 


   * ¥µ¥Ö¥É¥á¥¤¥ó¤Ç¥¾¡Ý¥ó¤Î´ÉÍý¤ò°Ñ¾ù¤·¤Ê¤¤¾ì¹ç

                A ¢£    B ¢¢
                  ¡Ã.1    ¡Ã.2  
        ------------------------- 192.9.200.0  nix.co.jp
            ¡Ã                          
            ¢¢  C ¢¢    D ¢¢     
            ¡Ã    ¡Ã3.    ¡Ã.4
        ------------------------- 192.9.201.0  aaa.nix.co.jp  

    /etc/named.boot
    ------------------------------------------------------
    |cache      .                       /etc/named.ca
    |primary    nix.co.jp               /etc/named.hosts
    |primary    200.9.192.in-addr.arp   /etc/named.rev

    /etc/named.hosts
    --------------------------------------------------------------
    |@          IN  SOA hostA.nix.co.jp. katou.hostA.nix.co.jp. ( ..
    |           IN  NS  hostA.nix.co.jp.
    |hostA      IN  A  192.9.200.1
    |hostB      IN  A  192.9.200.2          
    |hostC.aaa  IN  A  192.9.201.3
    |hostD.aaa  IN  A  192.9.201.4

    /etc/named.rev
    -----------------------------------------
    |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸
    |           IN  NS  hostA.nix.co.jp.
    |1          IN  PTR hostA.nix.co.jp.
    |2          IN  PTR hostB.nix.co.jp.      
    |
    |$ORIGIN 201.9.192.in-addr.arpa.            << ¤³¤¦¤¤¤¦µ­½Ò¤Î»ÅÊý¤â¤Ç¤­¤ë¡£¤·¤«
    |3          IN  PTR hostC.aaa.nix.co.jp.       ¤·´ÉÍý¤¹¤ë¥¾¡Ý¥ó¤ÎÈϰϤ¬Ê¬¤«¤ê¤Ë
    |4          IN  PTR hostD.aaa.nix.co.jp.       ¤¯¤¯¤Ê¤ë¡£¤¢¤Þ¤ê¤è¤í¤·¤¯¤Ê¤¤¡£


   * ¥µ¥Ö¥É¥á¥¤¥ó¤Ç¥¾¡Ý¥ó¤Î´ÉÍý¤ò°Ñ¾ù¤¹¤ë¾ì¹ç

                A ¢£    B ¢¢
                  ¡Ã.1    ¡Ã.2  
        ------------------------- 192.9.200.0  nix.co.jp
            ¡Ã                          
            ¢¢  C ¢£    D ¢¢
            ¡Ã    ¡Ã.3    ¡Ã.4
        ------------------------- 192.9.201.0  bbb.nix.co.jp  

    hostA /etc/named.boot
    ------------------------------------------------------
    |cache      .                       /etc/named.ca
    |primary    nix.co.jp               /etc/named.hosts
    |primary    200.9.192.in-addr.arp   /etc/named.rev


    hostA /etc/named.hosts
    -----------------------------------------------------------------
    |@          IN  SOA hostA.nix.co.jp. katou.hostA.nix.co.jp. ( ..
    |nix.co.jp.        IN  NS hostA.nix.co.jp.
    |hostA.nix.co.jp.  IN  A  192.9.200.1
    |hostB.nix.co.jp.  IN  A  192.9.200.2          
    |
    |bbb.nix.co.jp.       IN  NS hostC.bbb.nix.co.jp.
    |hostC.bbb.nix.co.jp. IN  A  192.9.201.3


    hostA /etc/named.rev
    -------------------------------------
    |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸
    |           IN  NS  hostA.nix.co.jp.
    |1          IN  PTR hostA.nix.co.jp.
    |2          IN  PTR hostB.nix.co.jp.      


    hostB /etc/named.boot
    ------------------------------------------------------
    |cache      .                       /etc/named.ca
    |primary    bbb.nix.co.jp           /etc/named.hosts
    |primary    201.9.192.in-addr.arp   /etc/named.rev


    hostB /etc/named.hosts
    -------------------------------------------------------------------------
    |@          IN  SOA hostC.bbb.nix.co.jp. katou.hostC.bbb.nix.co.jp. ( ..
    |bbb.nix.co.jp.       IN  NS  hostC.bbb.nix.co.jp.
    |hostC.bbb.nix.co.jp. IN  A  192.9.201.3
    |hostD.bbb.nix.co.jp. IN  A  192.9.201.4


    hostB /etc/named.rev
    -----------------------------------------
    |@ ¤Î¤È¤³¤í¾å¤ËƱ¤¸
    |           IN  NS  hostC.bbb.nix.co.jp.
    |3          IN  PTR hostC.bbb.nix.co.jp.
    |4          IN  PTR hostD.bbb.nix.co.jp.      


    [ ¥¤¥ó¥¿¡Ý¥Í¥Ã¥È¤ÈÀܳ¤¹¤ë¾ì¹ç¤Î¾å°Ì¥É¥á¥¤¥ó¤Ç¤ÎÅÐÏ¿ ]

    /etc/named.hosts
    -----------------------------------------
    |nix.co.jp.       IN NS hostA.nix.co.jp.    << bbb.nix.co.jp ¤Î¥¾¡Ý¥ó¾ðÊó¤Ï¤³¤³
    |hostA.nix.co.jp. IN A  192.9.200.1            ¤ò¤¿¤É¤Ã¤Æ¸¡º÷¤µ¤ì¤ë¤³¤È¤Ë¤Ê¤ë¡£


    /etc/named.rev
    ---------------------------------------------------
    |200.9.192.in-addr.arpa  IN NS hostA.nix.co.jp. 
    |201.9.192.in-addr.arpa  IN NS hostC.bbb.nix.co.jp. 


  (5) ¥Í¡Ý¥à¥µ¡Ý¥Ð¤ÎŬÀÚ¤ÊÀßÄê¤Ø  `24/04

   * ¥Í¡Ý¥à¥µ¡Ý¥Ð¤Î¥×¥í¥°¥é¥à¤Ï²¿¤ò»È¤¨¤Ð¤¤¤¤¤«

    BIND ¤Ç¤¢¤ì¤Ð¡¢BIND 4.x ¤Ï¤â¤¦»È¤ï¤Ê¤¤¤³¤È¡£http://www.isc.org/ ¥µ¥¤¥È¤ÇºÇ¿·¥Ð¡Ý
    ¥¸¥ç¥ó¤ò³Îǧ¤·¤Æ¡¢´ðËÜŪ¤Ë¤ÏºÇ¿·¤Î¤ò»È¤¦¤è¤¦¤Ë¤¹¤ë¤³¤È¡£¸Å¤¤¤Î¤Ï DoS¹¶·â¤Î¥»¥­¥å
    ¥ê¥Æ¥£¡¦¥Û¡Ý¥ë¤¬¤¢¤ë¤È¤«ÌäÂ꤬¤¢¤ë¡£ sendmail ¤Ë³Ó¤Ù¤ì¤Ð¥»¥­¥å¥ê¥Æ¥£¡¦¥Û¡Ý¥ë¤Îȯ
    ¸«¤Ï¾¯¤Ê¤¤¤¬¡¢BIND ¤Î¼ÂÁõ¤â·è¤·¤Æ°ÂÁ´¤È¤Ï¤¤¤¨¤Ê¤¤¡£¸½»þÅÀ¤Ç¤Ï BIND 8.x·ÏÎó¤Ç¤¢¤ì
    ¤Ð¡¢2004/01/26 ¥ê¥ê¡Ý¥¹¤Î BIND 8.4.4¡£BIND 8.x ·ÏÎó¤Ç¤¢¤ì¤Ð¡¢2003/10/23 ¥ê¥ê¡Ý¥¹
    ¤Î BIND 9.2.3 ¤¬ºÇ¿·¤Ç¤¢¤ë¡£2004/04/20 BIND 9.3 ¦ÂÈÇ¥ê¥ê¡Ý¥¹¡£

    BIND ¤Ç¤Ê¤¯ djbdns ¤ò»È¤¦¤³¤È¤ò¤½¤í¤½¤í¹Í¤¨¤Æ¤â¤¤¤¤¡£qmail ¤ä ucspi-tcp ¤òºî¤Ã¤¿
    D.J.Bernstein »á¤¬³«È¯¤·¤¿¥×¥í¥°¥é¥à¤Ç¤¢¤ë¡£°ÂÁ´¡¢³Î¼Â¡¢¹â®¡¢´Ê·é¡¢ÀßÄê¤â´Êñ¤È
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    djbdns ¤Ç¤Ï¥³¥ó¥Æ¥ó¥Ä(DNS)¥µ¡Ý¥Ð¤È¥×¥í¥­¥·(¥­¥ã¥Ã¥·¥å)¥µ¡Ý¥Ð¤¬¤¢¤ê¡¢Ê¬Î¥¤·¤Æ¤¤¤ë
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    ¤Ï dnscache ¤Ë¾¥É¥á¥¤¥ó¤Î¥Û¥¹¥È̾¤Î¸¡º÷¤ò°ÍÍꤹ¤ë¡£ root DNS ¤ËÁ̤äƸ¡º÷¤¹¤ë¤¿
    ¤áºÆµ¢¸¡º÷¤ò¹Ô¤¦¡£¤½¤·¤Æ²ò·è¤·¤¿£É£Ð¥¢¥É¥ì¥¹¤ò¥­¥ã¥Ã¥·¥å¤¹¤ë¡£


        A.2¤«¤éC.2¤Ë¥¢¥¯¥»¥¹  root DNS    B.1¤«¤éA.1¤Ë¥¢¥¯¥»¥¹   ¢¨ BIND¤Ç¤â¤³¤Î¤è¤¦
                  ¢«¡½¡½¡½¡½¡½  ¢£  ¢«¡½¡½¡½¡½¡½                    ¤ËʬΥ¤Ï¤Ç¤­¤ë¤¬¡¢
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