.\" Copyright (c) 1986 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted
.\" provided that the above copyright notice and this paragraph are
.\" duplicated in all such forms and that any documentation,
.\" advertising materials, and other materials related to such
.\" distribution and use acknowledge that the software was developed
.\" by the University of California, Berkeley.  The name of the
.\" University may not be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"	@(#)resolver.5	5.9 (Berkeley) 12/14/89
.\"	$Id: resolver.5,v 8.6 1999/05/21 00:01:02 vixie Exp $
.\"
.\" Added ndots remark by Bernhard R. Link - debian bug #182886
.\"
.\" Japanese Version Copyright (c) 2000, 2005 Yuichi SATO
.\"         all rights reserved.
.\" Translated Fri Sep 15 20:56:42 JST 2000
.\"         by Yuichi SATO <sato@complex.eng.hokudai.ac.jp>
.\" Updated & Modified Sat Jan 22 06:01:09 JST 2005
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\"
.\"WORD:	resolver	쥾
.\"WORD:	query		䤤碌
.\"
.TH RESOLV.CONF 5 2004-10-31 "" "Linux Programmer's Manual"
.UC 4
.SH ̾
resolv.conf \- 쥾ե
.SH 
.B /etc/resolv.conf
.SH 
.I resolver
ϡ󥿡ͥåȥɥᥤ͡ॷƥ (DNS) ؤΥ󶡤
C 饤֥Υ롼󷲤Ǥ롣
쥾եˤϡ쥾Х롼󤬥ץˤäƵư줿Ȥ
Ϥɤ߹ޤ󤬴ޤޤ롣
ΥեϿʹ֤˲ɤʤ褦߷פƤ롣
ɤͤΥꥹȤޤޤ졢ʥפΥ쥾о󶡤롣
.LP
̤ꤵ줿ƥǤϡΥեɬפʤ
䤤碌򤵤ͣΥ͡ॵФϥޥˤ롣
ɥᥤ̾ϥۥ̾ꤵ졢
ɥᥤθѥϥɥᥤ̾롣
.LP
ξ֤ѹ뤿ꥪץˤϡʲΤ褦ʤΤ롣
.TP
\fBnameserver\fP ͡ॵФ IP ɥ쥹
쥾Ф䤤碌򤹤͡ॵФ
(ɥåɽ) 󥿡ͥåȥɥ쥹
Υ 1 ĤȤ 1 Ťġ
.B MAXNS
 (Ǥ 3 桢\fI<resolv.h>\fP 򻲾) ޤǤΥ͡ॵФꥹȤǤ롣
ʣΥФꤵ줿硢쥾Х饤֥
ꥹȤ줿䤤碌Ԥ
\fBnameserver\fP ȥ꤬ʤ硢
ǥեȤǤϥޥΥ͡ॵФȤ롣
(ǻȤ륢르ꥺϰʲΤ褦ʤΤǤ롣
Ϥ˥͡ॵФ䤤碌ߤ롣
䤤碌ॢȤˤʤä硢
Υ͡ॵФ䤤碌ߤ롣
͡ॵФʤʤޤ³롣
Ǥʤϡȥ饤ãޤ
ƤΥ͡ॵФ䤤碌򷫤֤)
.TP
\fBdomain\fP ɥᥤ̾
Υɥᥤˤ̾䤤碌ΤۤȤɤˡ
Υɥᥤˤû̾Ѥ뤳ȤǤ롣
\fBdomain\fP ȥ꤬ʤ硢ɥᥤ̾
.BR gethostname (3)
֤ۥ̾ꤵ졢
ǽ '.' ʹߤƤʬɥᥤ̾Ȥ롣
Υۥ̾ˤɥᥤޤǤʤ硢롼ȥɥᥤ󤬲ꤵ롣
.TP
\fBsearch\fP ۥ̾ååפΤθꥹ
ꥹȤ̾ɥᥤ̾ꤵ롣
ǥեȤǤϡꥹȤϥɥᥤ̾ΤߤǤ롣
ѹˤϡ\fIsearch\fP ɤθ
˾ɥᥤ󸡺ѥ򥹥ڡޤϥ֤ǶڤäƥꥹȤФ褤
ɥåȤο
.I ndots
(ǥեȤǤ 1) 꾯ʤ쥾Ф䤤碌ϡ
פΤĤޤǸѥγǤ˻Ȥäƻ
ʣΥ֥ɥᥤĴĶǤϡ
軰Ԥˤ빶 (man-in-the-middle attack) 
롼 DNS Фؤɬפʥȥեå򤱤뤿ˡ
ʲ
.BI "options ndots:" n
ɤǤۤ
.\" resolv.conv 
.\"  search subdomain.domain.tld domain.tld
.\" ʲΤ褦ʹԤˡȤ
.\"  ping host.anothersubdomain
.\" ˤۥȤθԤȡ
.\"  host.anothersubdomain.
.\"  host.anothersubdomain.subdomain.domain.tld.
.\"  host.anothersubdomain.domain.tld.
.\" Ф DNS ꥯȤ롣
.\" ˤäơ롼 DNS ФФ
.\" ɬפʥȥեåǤʤ
.\" ˾ФޤƤޤˡ軰Ԥˤ빶⤬ǽˤʤ롣
Υץ٤ꥹȤ줿ɥᥤ󤬥ΤΤǤʤ硢
¿ʥͥåȥȥեåȯ뤳Ȥդ뤳ȡ
ˡΥɥᥤΤ줫ҤȤĤˤǤŬڤʥФʤ硢
䤤碌ॢȤˤʤˤդ뤳ȡ
.IP
ǤϡꥹȤ 6 ɥᥤ󡦷 256 ʸ¤Ƥ롣
.TP
\fBsortlist\fP
sortlist ˤꡢ
.BR gethostbyname (3)
֤륢ɥ쥹򥽡Ȥ뤳ȤǤ롣
sortlist  IP ɥ쥹ȥͥåȥޥΥڥǻꤵ롣
ͥåȥޥϾάǽǤꡢ
ǥեȤǤϥͥåȤФǥեȤΥͥåȥޥǤ롣
IP ɥ쥹ȥץΥͥåȥޥΥڥϥåǶڤ롣
 10 ȤΥڥǤ롣
:
.br
.in +4n
sortlist 130.155.160.0/255.255.240.0 130.155.0.0
.in
.br
.TP
\fBoptions\fP
options ˤꡢ쥾Фѿѹ뤳ȤǤ롣
񼰤ϰʲ̤Ǥ롣
.RS
.IP
\fBoptions\fP \fIoption\fP \fI...\fP
.LP
 \fIoption\fP ϼΤΤ줫Ǥ롣
.TP
\fBdebug\fP
.I _res.options

.B RES_DEBUG
ꤹ롣
.TP
.BI ndots: n
\fIǽδ̾Ǥ䤤碌\fP¹Ԥˡ
.BR res_query (3)
.RB ( resolver (3)
򻲾) Ϳ̾˴ޤޤƤ٤ɥåȤο͡פꤹ롣
\fIn\fP ΥǥեȤ 1 Ǥ롣
ϡ̾˥ɥåȤ硢\fIsearch list\fP Ǥղäˡ
̾̾Ȥƺǽ˻ȤȤ̣Ƥ롣
.TP
.BI timeout: n
֥쥾Ф¾Υ͡ॵФ䤤碌ȥ饤ˡ
⡼ȥ͡ॵФαԤĻ֡פꤹ롣
ñ̤äǡǥեȤ
.B RES_TIMEOUT
Ǥ
(Ǥ 5 á\fI<resolv.h>\fP 򻲾)
.TP
.BI attempts: n
֥쥾ФƸƤӽФΥץꥱ˥顼֤ޤǤˡ
͡ॵФ䤤碌Ԥפꤹ롣
ǥեȤ
.B RES_DFLRETRY
Ǥ
(Ǥ 2 \fI<resolv.h>\fP 򻲾)
.TP
.B rotate
.I _res.options
 RES_ROTATE ꤹ롣
ꥹȤƤ͡ॵФ֤Ȥˡ
饦ɥӥ (round robin) Ԥ碌롣
ꥹȤƤƤΥФ䤤碌٤ʬ̤ꡢ
ǽ˥ꥹȤ줿ФƤΥ饤Ȥ
ǽ䤤碌Ԥ櫓ǤϤʤʤ롣
.TP
.B no-check-names
.I _res.options

.B RES_NOCHECKNAME
ꤹ롣
äƤۥ̾ȥ᡼륢ɥ쥹ˡ
 (_)ASCII ʳʸʸȤä
ʸޤޤƤʤĴ٤
Ƕ BIND Υå̵ˤ롣
.TP
.B inet6
.I _res.options
 RES_USE_INET6 ꤹ롣
.BR gethostbyname (3)
ؿ A 쥳ɤ䤤碌Ԥ
AAAA 쥳ɤ䤤碌Ԥ碌ꡢ
AAAA 쥳ɤϸĤʤ A 쥳ɥåȤ¸ߤˡ
IPv4 α IPv6֥ȥͥפ˥ޥåפꤹ롣
.RE
.LP
\fIdomain\fP  \fIsearch\fP ɤϡߤ¾ŪǤ롣
Υɤ 2 İʾ嵭ҤƤ硢
Ǹ˵ҤƤΤͭˤʤ롣
.LP
ƥ \fIresolv.conf\fP եˤ \fIsearch\fP ɤϡ
ڡǶڤäɥᥤΥꥹȤ
Ķѿ
.B LOCALDOMAIN
ꤹ뤳Ȥˤꡢƥץ˾񤭤뤳ȤǤ롣
.LP
ƥ \fIresolv.conf\fP եˤ \fIoptions\fP ɤϡ
 \fBoptions\fP 褦ˡ
ڡǶڤä쥾ХץΥꥹȤ
Ķѿ
.B RES_OPTIONS
ꤹ뤳Ȥˤꡢƥץ˽뤳ȤǤ롣
.LP
ɤͤƱԤ˽񤫤ʤФʤʤ
ޤ(\fBnameserver\fP Τ褦) ɤԤƬˤʤФʤʤ
ͤϥɤθ˥ڡǶڤä³롣
.SH ե
.IR /etc/resolv.conf ,
.I <resolv.h>
.SH Ϣ
.BR gethostbyname (3),
.BR resolver (3),
.BR hostname (7),
.BR named (8)
.br
BIND Υ͡ॵХڥ졼󥬥