»OÆWºô»Úºô¸ô¤W DNS ¨t²Î³W¹º, ¥Ø«e±`¨£ªº°ÝÃD

Joe. C.S.Chen
cschen@cc.nctu.edu.tw 
  • ºK­n»¡©ú: 
    • 

   »OÆWºô»Úºô¸ô¤W DNS ¨t²Î¤W, ¥Ø«e³Ì±`¨£ªºÂk³W¹º»P³]©w°ÝÃD

      

    1. forward/reverse DNS database µn¿ý¤£¥þ
      2. 
     
     ½Ð°Ñ¾\©³¤U URL,

	http://dnsrd.nctu.edu.tw/DNS-basic/IP-dns.html
	  - " DNS ¨t²Î¥\¯à²¤¶"

	http://dnsrd.nctu.edu.tw/DNS-misc/promote.html
	  - "Ãö©ó¦¹¦¸°·¥þDNS ³]©w±À®i¬¡°Ê"

	http://dnsrd.nctu.edu.tw/DNS-conf/For-dns-Rev.html
	  -- "¬°¤°»ò forward »P reverse DNS database ·|¤À¶}ºÞ²z ? "

	http://dnsrd.nctu.edu.tw/DNS-conf/For-dns-Rev-02.html
	  -- "¬°¤°»ò forward »P reverse DNS database ·|¤À¶}ºÞ²z ? (Äò) "


    2. ¦³«Ü¦h³æ¦ìªº domain zones §¹¥þ¨S¦³ secondary DNS servers.
      3. 

   -- ¤×¨ä, ¾ã­Ó gov.tw , ¦U³æ¦ì´X¥G§¹¥þ, ³£¬O¥u¦³¤@­Ó DNS server.
      ==> ¨S¦³ºô¸ôªA°È«~½èªºÆ[©À. ( ¤W¼h³æ¦ì¥¼ºÉ§âÃö³d¥ô )
      ==> low quality DNS and/or Network services
	* down/delay DNS and related network services
	* both Forward and Reverse domain zones

          ==> Ãþ¦üªº±¡ªp. COM.tw, NET.tw, ORG.tw ¤]«Ü´¶¹M.

     ½Ð°Ñ¾\©³¤U URL,

     	http://dnsrd.nctu.edu.tw/DNS-conf/Srv-Req.html
	  -"Subject: [DNS] server host ªº°ò¥»³]³Æ»Ý¨D»P«Ø¸m³W¹º"

	http://dnsrd.nctu.edu.tw/DNS-conf/Srv-Req2.html
	  -"Subject: [DNS] server host ªº°ò¥»³]³Æ»Ý¨D»P«Ø¸m³W¹º(2)"


    3. ¦P¤@ DNS server, ¦h­« domain zones ªº³]©w°ÝÃD.
      4. 
   ==> wrong primary authoritative conf. lines in /etc/named.boot

     ½Ð°Ñ¾\©³¤U URL,
   	http://dnsrd.nctu.edu.tw/DNS-conf/Named-boot.html
  	  - "Subject: [DNS] /etc/named.boot ³]©wªº½Ñ¦h°ÝÃD "


    4. ¤£¥¿½Tªº secondary server caching °µªk.
      5. 
   ==> un-necessary secondary caching, ½Ð°Ñ¾\.

     ½Ð°Ñ¾\©³¤U URL,
	http://dnsrd.nctu.edu.tw/DNS-conf/Named-boot.html
          - "Subject: [DNS] /etc/named.boot ³]©wªº½Ñ¦h°ÝÃD "

     	http://dnsrd.nctu.edu.tw/DNS-conf/TLD-ns-Axfr-limit-03.html
	  -"»~¥Î secondary caching ªº¤£¨}¼vÅT (¤×¨ä¬O¹ï¸û¤W¼hªº DNS server)"


    5. ¨ú¤£¾A·íªº domain zone ¦WºÙ
      6. 

    e.g., ( numbers in domain zones )
   
     - "104.com.tw" ( maybe more )  
     - "007.com.tw"



    6. ¨Ï¥Îª©¥»¹Lªº DNS server ³nÅé.
      7. 
   ==> ³Ì·sª©¥» BIND 8.1.1/4.9.6-REL.  °Ñ¾\,

     ½Ð°Ñ¾\©³¤U URL,
	http://dnsrd.nctu.edu.tw/DNS-bind/Named-ver.html
	  - "¦p¦ó½T©w, ¦Û¤vºÞ²zªº¨t²Î¤Wªº DNS/named ªºª©¥» ?"

	http://dnsrd.nctu.edu.tw/DNS-bind/bind-URL.html
	  - "­þùØ¥i¥H¨ú±o³Ì·sª©ªº BIND ¬ÛÃöµ{¦¡ (source code) »P ¤å¥ó»¡©ú ?"

	http://dnsrd.nctu.edu.tw/DNS-bind/8.1-v-4.9.html
	  - "Subject: Re: ¸Ó´«bind 8.xÁÙ¬Obind-4.9.6-REL "



    7. ¨ä¥¦³]©w¿ù»~
      8. 
   - CNAME, Lame server, invalid hostname, ...

     ½Ð°Ñ¾\©³¤U URL,
	http://dnsrd.nctu.edu.tw/DNS-Comm-Err/conf-err.html
	  - "¦w¸Ë DNS/BIND-8.1.1 ¨t²Î¤W±`¨£¤Wªº¿ù»~°T®§ "