Subject: Re: [Question] hostname and domain name
ºKn»¡©ú:
¥Ñ RFC 1178, 1535 ½Í domain zone name ©R¦W ©M hostname ªº¿ï¾Ü
RFC 1178, "Choosing a Name for Your Computer"
RFC 1535, A Security Problem and Proposed Correction With Widely Deployed DNS Software
Path: netnews.NCTU.edu.tw!news2!not-for-mail
From: cschen@cc.nctu.edu.tw (C.S.Chen)
Newsgroups: tw.bbs.config,tw.bbs.comp.network
Subject: Re: [Question] hostname and domain name
Date: 16 Jul 1997 07:20:31 GMT
Organization: National Chiao Tung University, Hsinchu, Taiwan
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Message-ID: <5qhsnv$s93$1@news2.nctu.edu.tw>
References: <5qc5i6$1gp@aidebbs.edu.tw>
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Tsung Han Yang (han@biostat.cgu.edu.tw) ´£¨ì:
: °ÝÓÃö©ó hostname & domain name ªº°ÝÃD.
:
: ¦b Rfc 1178 (choosing a name for your computer) ¤¤¦³¤@¬q
: »¡¨ì hostname ³Ì¦n¬O avoid domain names.
: ---
: Avoid domain names
: For technical reasons, domain names should be avoided. In
: particular, name resolution of non-absolute hoshnames is
: problematic. Resolvers will check names against domains before
: checking them against hostnames. ...
: [delete, ¤§«á¥LÁ|¤FÓ¨Ò¤l - ¬O»¡ email µ¹ libes@rutgers at
: yale.edu. ¥i¯à·|±H¨ì libes@rutgers.edu ]
³o¤@¬q»¡©úªº·N«ä¬O»¡,
---------------------------------------------------
1) ¦³¤@Ó YALE ¤j¾Ç, ¦b ".edu" µù¥U ".yale.edu".
2) ¦³¤@Ó Rutgers ¤j¾Ç, ¦b ".edu" µù¥U ".rutgers.edu".
©Ò¥H, "rutgers.yale.edu." ³o¼Ëªº¦W¦r, ¥i¯à·|¥X²{³\¦h°ÝÃD.
-- ³Ì¦n, ¤£n¦b "yale.edu" ¤Uµn°O³oºØ¦WºÙ.
¦ý, ³oºØ°ÝÃD, »¡¹ê¦bªº, ÆZÃøÁקKªº.
¨ä¹ê, ³oºØ¨Ò¤l, ²{¦b Internet ¤W¤@°ï.
²z½×¤W, ¦b»OÆW, «Ü¦h¾Ç®Õ, ".edu.tw" ¤U, ¦pªGn±H e-mail
¨ì¬ü°ê MIT, ¦pªG e-mail address Ãþ¦ü¤U±, (¨â³y³£¦³)
¥i¯à´N¤@¤Ñ¨ì±ß³£·|¥X°ÝÃD.
mbox@mit.edu ( ¬ü°ê MIT )
mbox@mit.edu.tw ( ©ú§Ó¤u±M)
¥Ø«e, ©ú§Ó¤u±M¨S¦³¬° mit.edu.tw ³] MX RR, ¦pªG³]¤F, «Ü¥i¯à·|¤Ñ¤U¤j¶Ã.
¦]¬°, ºô¸ô¤W¤@°ïªº BIND ³£ÁÙ¬O BIND 4.8.3.
°²³], ¬Y host ªº /etc/resolv.conf ªº domain ³]¦¨ A.EDU.TW
n°e " mbox@mit.edu " ³o¼Ëªº mail, ¥Ø«e³Ì±`¨£ªº BIND ·|·Ó©³¤Uªº¶¶§Ç.
- mbox@mit.edu.A.EDU.TW
- mbox@mit.edu.EDU.TW
- mbox@mit.edu.TW <-- ©ú§Ó¤u±M ( ¥Ø«e¤£¦s¦b ³oºØ e-mail addr. )
- mbox@mit.edu. <-- ¬ü°ê MIT
·sª©ªº BIND, ¹ï " mbox@mit.edu " <-- no endind '. '
·|¸Õ³o¨âÓ.
- mbox@mit.edu <-- ¬ü°ê MIT
- mbox@mit.edu.A.edu.tw.
°Ñ·Ó BIND 4.9.6-REL ªº OPTIONS »¡©ú
------------------------------------------------
RFC1535 (origin: paul@vix.com)
if set, the resolver's default "search" list will be just the entire
"domain" name rather than the sliding window it had before 4.9.2. this will
make the default search list shorter, so folks who are saying "domain a.b.c"
and relying on the implicit "search a.b.c a.b c" will miss "a.b" and "c".
this option is on for compatibility with RFC 1535.
you should NOT turn it off, it is on by default.
: ---
:
: Á|¨Ò»¡©ú§Ú¹J¨ìªº°ÝÃD (3 Ó)
:
: 1.
: ¥Ø«e¤w¦³ host ABC.cgu.edu.tw ¦ì©ó cgu.edu.tw ªº main frame ¤W,
: ¦Ó ABC ³o³æ¦ì¤]¦³¥»¨ªº lan (novell), ²{¦b·Q¦b lan ¤W¥[¤@¥x unix.
: ·Q¥H xyz °µ¬°¥Lªº hostname ¦Ó ABC.cgu.edu.tw °µ¬°¥Lªº domain.
: ³o¼Ë¬O§_¦³°ÝÃD??? if so then ABC.cgu.edu.tw ´N¬J¬O domain ¤]¬O host name.
: ¦ý, RFC 1178 Á|ªº¨ºÓ¨Ò¤l¤]¤£·|µo¥Í¦b³oÓ±¡ªp¤U°Ú.
: (user@ABC vs user@xyz.ABC)
¬Ý¤£¥X, ³o¸ò RFC 1178 ¦³¤°»òÃö«Y.
§A»¡ªº±¡ªp, ³o¤£·|¦³°ÝÃD. «Ü¦h³æ¦ì³£³o¼Ë¥Î.
NCTU.edu.tw ¬J¬O¤@Ó domain zone ªº¦WºÙ, ¤]¬O¤@Ó FQDN. ³o¦b DNS ¨t²Î¤W,
¬O¨âºØ¤£¦Pªº record ( NS, A), ¤£·|¦³©èIJ.
§ó¦hªº¨Ò¤l.
-- CC.NCTU.edu.tw, csie.nctu.edu.tw, ...
-- NTHU.edu.tw, ...
: 2.
: ¦A¨Ó´N¬O DNS ªº³]©w. Y¤£¬O¥H xyz.ABC.cgu.edu.tw ¬° ABC.cgu.edu.tw
: (domain) ªº primary DNS, ¦Ó¬O¥H ABC.cgu.edu.tw ¨Ó©w¸q ABC.cgu.edu.tw
: ³oÓ domain.
:
: ABC.cgu.edu.tw ªº resolv.conf (see PS.1) ¤£¥Îקï. ¤£»Ý¦A¥[¤W
: 'domain ABC.cgu.edu.tw'. ¹ï§a. ¦Ó xyz.ABC.cgu.edu.tw ªº
: resolv.conf (PS.2) ´N³]¦¨§Ú¤U±¼gªº¨º¼Ë.
resolv.conf ªº³]©w, ¥»´N¬O¬°¤F¤è«K. ¤£ºÞ«ç¼Ë, µª®×¤@©w¥i¥H´ê¥X¨Ó.
: 3.
: Y¬O·Ó§Ú»¡ªº³]©w, ¨º§ÚÁÙn§i¶D cgu.edu.tw domain ªº soa ¤°»ò©O?
: ¦Ó ABC.cgu.edu.tw ¤]»Ý³]¦¨ ABC.cgu.edu.tw (domain) ªº soa. ¹ï§a.
¤£©ú¥Õ, ³oùظò SOA ªºþ¤@¶µ·|¦³©èIJ.
-- §A·|¤£·|·d¿ù, ¤°»ò¬O DNS ¤Wªº SOA RR ?
NCTU.edu.tw ¹L¥h¤@ª½³o¼Ë¥Î, NTHU.edu.tw ¤@ª½³o¼Ë¥Î.
-- «Ü¦h³æ¦ì³£³o¼Ë¥Î, ÁÙ¤£³£ run ±o¦n¦nªº.
:
: PS.1 resolv.conf @ ABC.cgu.edu.tw
: ---
: domain cgu.edu.tw
: nameserver ip.of.soa.of.cgu.edu.tw
: nameserver ....
: ---
:
: PS.2 resolv.conf @ xyz.ABC.cgu.edu.tw
: ---
: domain ABC.cgu.edu.tw
: nameserver ip.of.ABC.cgu.edu.tw
: ---
--
Joe. C.S.Chen, cschen@ns.nctu.edu.tw