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Linuxdoc Sgml/Sendmail_DRAC-TRANS

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 ¹ø¿ª/º¯È¯ Çã⿵ escargo@zob.netsource.co.kr
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<!doctype linuxdoc system>
<article>
<title>Sendmail¿¡¼­ DRAC¸¦ ÀÌ¿ëÇÑ Dynamic Relay(RedHat 7.0)</title>
<author> Author - Colin Bloch <htmlurl url="mailto:bofh@lsn.net" name="bofh@lsn.net"></author>
<date>2000³â 12¿ù 04ÀÏ</date>

<trans>Çã⿵  <htmlurl url="mailto:escargo@zob.netsource.co.kr" name="escargo@netsource.co.kr">
<tdate>2001³â 1¿ù 19ÀÏ

<abstract>
ÀÌ ¹®¼­´Â Sendmail ÇÏ¿¡¼­ accessÆÄÀϰú DRAC(Dynamic Relay Autohrization Control)¸¦ 
ÀÌ¿ëÇÑ µ¿Àû ¸±·¹ÀÌ ¼³Á¤°ú ±× À̿뿡 ´ëÇÑ ¹®¼­ÀÌ´Ù. µ¿Àû ¾ÆÀÌÇǸ¦ °¡Áö´Â ¸ÞÀÏ Å¬¶óÀ̾ð
Æ®µéÀÇ ¸ÞÀϸ±·¹À̸¦ °¡´ÉÇÏ°Ô Çϴµ¥ °ü½ÉÀÖ´Â »ç¶÷µéÀ» ´ë»óÀ¸·Î Çϰí ÀÖ´Ù. À̱ÛÀ» ¹ø¿ªÇϰí À̰÷¿¡ ¿Ã¸®´Â °ÍÀ» Çã¶ôÇØÁֽŠ¿øÀÛÀÚ Colin Bloch´Ô²² °¨»çÀÇ ¸»¾¸À» µå¸°´Ù.
</abstract>
<toc>

<sect>DRAC ¼Ò °³
<p>

Sendmail(SMTP) ¹öÁ¯ ÃֽŹöÁ¯Àº  Relay ±ÝÁö°¡ Default·Î ¼³Á¤µÇ¾î ÀÖ¾î  localhost¿ÜÀÇ 
Mail Relay´Â /etc/mail/access ÆÄÀÏ¿¡ relay IP³ª host¸¦ µî·ÏÇÔÀ¸·Î½á °¡´ÉÇѵ¥, ÀÌ ¹æ¹ýÀº 
DHCPµîÀ¸·Î IP µîÀ» ºÎ¿©¹Þ´Â °íÁ¤ ¾ÆÀÌÇǰ¡ ¾Æ´Ñ ¸ÞÀÏŬ¶óÀ̾ðÆ®(È£½ºÆ®)µéÀÇ Relay °ü¸®
¿¡´Â ¸¹Àº ºÒÆí°ú ¾î·Á¿òÀÌ µû¸¥´Ù. ¹°·Ð ¸ðµç Relay°¡ °¡´ÉÇϵµ·Ï sendmail.cf³ª accessÆÄ
ÀÏÀ» °íÃÄÁÖ´Â °ÍÀÌ °¡Àå ¼Õ½¬¿î ¹æ¹ýÀ̱ä ÇϰÚÁö¸¸, À̰ÍÀº SpammerµéÀÇ ÁÖ¿äŸŶÀÌ µÇ¾î
¹ö¸®´Â À§ÇèÀ» ³»Æ÷Çϰí Àֱ⵵ ÇÏ°í ¹«¾ùº¸´Ùµµ Relay¼³Á¤ÀÇ Àǹ̸¦ ¸Á°¢(?)ÇÏ´Â ÀÏÀÌ µÉ 
°ÍÀÌ´Ù. ÀÌ·¯ÇÑ µ¿Àû¾ÆÀÌÇǸ¦ °¡Áö´Â ¸ÞÀÏŬ¶óÀÌ¾ðÆ®µéÀÇ Relay °ü¸®¿¡ ¾î·Á¿òÀ» °®°í ¾ó¸¶
Àü µ¿Àû ¾ÆÀÌÇǵéÀÇ Relay Çã¿ë ¿©ºÎ¸¦ ÀÚµ¿À¸·Î °ü¸®ÇØÁְųª ÀÎÁõÀ» ÅëÇØ ÇÒ ¼ö ÀÖ´Â Åøµé
ÀÌ ¾øÀ»±î ã¾Æº¸´Ù°¡ DRAC(Dynamic Relay Authoriazation Control) ¸» ±×´ë·Î 'µ¿Àû¸±·¹ÀÌ
ÀÎÁõÁ¦¾î'¶ó´Â À̸§À» °¡Áø ÇÁ·Î±×·¥À» ã¾Ò´Ù. ¹°·Ð ÀÌ ÇÁ·Î±×·¥À» ¾Ë°í ÀÖ´Â »ç¶÷µµ ÀÖ°Ú
Áö¸¸, Ȥ¿©³ª ¾ËÁö ¸øÇÏ´Â À̵鿡°Ô µµ¿òÀÌ µÉ±îÇÏ¿© DRACÀÇ ¼³Ä¡¿Í ¼ÂÆÃ ¹æ¹ýÀ» ¹®¼­¸¦ Âü
°íÇÏ¿©(Âü°í¶ó±âº¸´Ù´Â ¹ø¿ªÀÇ ¼öÁØ¿¡ °¡±õ´Ù ÇϰڴÙ) ±â¼úÇØº¸°íÀÚ ÇÑ´Ù. Âü°í·Î ÀÌ ¹®¼­´Â 
Redhat 7.0ȯ°æ¿¡¼­ ÀνºÅç°ú ¼ÂÆÃÀ» ±âÁØÀ¸·Î ÇÏ¿´´Ù. (³ª¸ÓÁö ȯ°æÇÏ¿¡¼± ÃßÈÄ Ãß°¡ÇϰÅ
³ª Á» ´õ ÁÁÀº µ¿Àû¸±·¹ÀÌ ¼³Á¤ ÇÁ·Î±×·¥À» ¹ß°ßÇÏ°Ô µÇ¸é ±× °ÍÀ¸·Î ´ëüÇϰíÀÚ ÇÑ´Ù.
</p>
<p>
DRAC´Â µ¿Àû¾ÆÀÌÇǸ¦ °¡Áö´Â È£½ºÆ®µéÀÇ ¸ÞÀϸ±·¹À̸¦ POP3¸¦ ÅëÇÑ ÀÎÁõ ¸ÅÄ«´ÏÁòÀ¸·Î 
µ¥ÀÌÅͺ£À̽º(/etc/mail/dracd.db)¸¦ ±¸ÃàÇÏ¿© À̸¦ ¹ÙÅÁÀ¸·Î ¸ÞÀϸ±·¹À̸¦ Çã¿ëÇÏ´Â 
daemonÀÌ´Ù. ´Ù½Ã¸»Çϸé localhost ¸ÞÀϼ­¹ö¿¡ ¸ÞÀÏ °èÁ¤À» °¡Áö°í ÀÖ´Â »ç¶÷ÀÌ RelayÇã¿ë
À» ÀÎÁõ¹ÞÁö ¸øÇÑ È£½ºÆ®¿¡¼­ pop3¼­¹ö¿¡ Á¢¼ÓÇÏ¿© pop3ÀÇ ÀÎÁõ¿¡ ¼º°øÇϸé À̸¦ ¹ÙÅÁÀ¸·Î 
¼º°øÇßÀ» ¶§ÀÇ ¾ÆÀÌÇÇ ÁÖ¼Ò¸¦ µ¥ÀÌÅͺ£À̽ºÈ­ÇÏ¿© ÀÌ µ¥ÀÌÅ͸¦ ±Ù°Å·Î ±× ¾ÆÀÌÇÇ¿¡°Ô ÀÏÁ¤
½Ã°£µ¿¾È ¸ÞÀÏ ¸±·¹À̸¦ Çã¿ëÇϰÔÇÑ´Ù.(DRACÀÇ ±âº» ¸ÞÀϸ±·¹ÀÌ À¯È¿½Ã°£Àº 30ºÐÀÌÁö¸¸ 
À̰ÍÀº ´Ù¸£°Ô ¼³Á¤ÀÌ °¡´ÉÇÏ´Ù) ÀÏÁ¤ÀÇ ½Ã°£ÀÌ Áö³ª°Ô µÇ¸é ´Ù½Ã ±× ¾ÆÀÌÇǷμ­ÀÇ ¸ÞÀϸ±·¹
ÀÌ´Â ´ÝÇôÁö°Ô µÇ°í ´Ù½Ã µ¿ÀÏÇÑ »ç¿ëÀÚ°¡ ´Ù¸¥ IP·Î POP3 ÀÎÁõ¿¡ ¼º°øÇÏ°Ô µÇ¸é ´Ù½Ã ±× ´Ù
¸¥ ¾ÆÀÌÇÇ´Â µ¥ÀÌÅͺ£À̽º¿¡ µî·ÏµÇ°Ô µÇ°í ±× ¾ÆÀÌÇÇ·Î ´Ù½Ã ¸ÞÀϸ±·¹À̰¡ °¡´ÉÇÏ°Ô µÇ´Â 
°³³äÀÇ ÇÁ·Î±×·¥À̶ó°í º¸¸é µÈ´Ù. ¹°·Ð µ¿ÀûÀÎ ¾Æ´Ñ Á¤ÀûÀ¸·Î ±×·¯´Ï±î ¿µ±¸ÀûÀ¸·Î ¸ÞÀϸ±
·¹ÀÌÀÇ ¼³Á¤ÀÌ ÇÊ¿äÇÑ ºÎºÐÀº /etc/mail/accssÆÄÀÏÀ» ÀÌ¿ëÇÏ¸é µÇ°í ÀÌ accssÆÄÀÏÀÇ ¼³Á¤ÀÌ 
DRACÀÇ ¼³Á¤À» override  Áï ¼±ÇàÇÑ´Ù.
</p>

<sect> ÇÊ¿äÇÑ ÆÐŰÁö,  ¼³Ä¡, ½Ãµ¿
<p>
<sect1> ±âº»ÆÐŰÁö (Standard RH7.0 distribution packages)
</p>

<p>
1) xinetd (xinetd-2.1.8.9pre9-6.i386.rpm)  -- RedHat 7.0 ¿¡¼­ inetdÀÇ º¯È­µÈ ¹öÁ¯ÀÌ´Ù.

2) db3-devel (db3-devel-3.1.14-6.i386.rpm)

3) sendmail (sendmail-8.11.0-8.i386.rpm)

4) portmap (portmap-4.0-29.i386.rpm)
</p>

<p>
À§ÀÇ ÆÐŰÁöµéÀº ·¹µåÇÞ 7.0 ±âº»ÆÐŰÁöÀε¥ ¸ðµç °ÍÀÌ ´Ù ¼³Ä¡µÇ¾î ÀÖÀ» ¼öµµ ÀÖ°í ±×·¸Áö
¸øÇÒ ¼ö µµ ÀÖ´Ù. ´ÙÀ½°ú °°ÀÌ È®ÀÎÇØº¸°í ¼³Ä¡µÇ¾î ÀÖÁö ¾ÊÀ¸¸é ¼³Ä¡ÇØÁØ´Ù.
</p>

<code>
*È®ÀÎ
$ rpm -q db3-devel    --  ³ª¸ÓÁö ÆÐŰÁöµµ ¸¶Âù°¡Áö
*¼³Ä¡
$ rpm -Uvh package_name
</code>

<sect1>Ãß°¡ÆÐŰÁö 
<p>
drac ¿î¿µÀ» À§ÇØ ²À ÇÊ¿äÇÑ ÆÐŰÁöµéÀÌ´Ù. ´Ù¿î Çʼö.
</p>
<p>
 - DRAC : <url url="http://www.ls-l.net/drac/redhat/drac-1.11-1.i386.rpm" name="drac-1.11-1.i386.rpm">

- qpopper w/drac : <url url="http://www.ls-l.net/drac/redhat/qpopper-3.1.2-1.i386.rpm" name="qpopper-3.1.2-1.i386.rpm">
</p>

<p>                                         
¸¸¾à qmail°ú °°Àº Maildir mboxÆ÷¸äÀ» Áö¿øÇÏ´Â pop3µ¥¸óÀÌ ÇÊ¿äÇÏ´Ù¸é  <url 
url=" http://www.ls-l.net/drac/qmail.html" name="http://www.ls-l.net/drac/qmail.html">
¸¦ ÂüÁ¶ÇÑ´Ù. 
</p>

<p>
qpopper ¼³Ä¡½Ã ÀÚµ¿À¸·Î xinetd¿¡ ÇÊ¿äÇÑ ÆÄÀϵéÀ» ÀÚµ¿À¸·Î ¼³Ä¡Çϸ鼭 xinetd¸¦ Àç½Ãµ¿
ÇÏ°Ô µÇ´Âµ¥ À̶§ ¸¸¾à xinetd°¡ ½Ãµ¿µÇ¾î ÀÖ´ø »óŰ¡ ¾Æ´Ï¶ó¸é FAILD¶ó´Â ¸Þ¼¼Áö¸¦ º¸°ÔµÇ
´Âµ¥ ÀÌ´Â ÇÁ·Î±×·¥ ¼³Ä¡¿Í ¿î¿µ¿¡ ÀüÇô ¿µÇâÀÌ ¾øÀ¸´Ï ¹«½ÃÇ϶ó.
</p>

<sect1>º¸Á¶ÆÐŰÁö(Optional packages) 
<p>

sendmail w/drac - <url url="http://www.ls-l.net/drac/redhat/sendmail-8.11.0-8.i386.rpm" name="sendmail-8.11.0-8.i386.rpm ">

</p>

<p>
ÀÌ ÆÐŰÁö´Â DRAC¿î¿µÀ» À§ÇØ sendmail-cfÀÇ À籸¼ºÀ» ÀÚµ¿À¸·Î ÇÏ´Â ÆÐŰÁöÀÌ´Ù. ´Ü ÀÌ ÆÐ
ŰÁö¸¦ ¼³Ä¡ÇÏ¸é ±âÁ¸ÀÇ sendmail.cf¸¦ sendmail.cf.rpmsave·Î ±³Ã¼Çϱ⠶§¹®¿¡ 
sendmail.cf¸¦ À籸¼ºÇؾßÇÑ´Ù.
</p>


<sect1> 2. ½Ã½ºÅÛÁغñ¿Í DRACD(DRAC daemon) ½Ãµ¿

<p>
1) portmap ÀÌ ½ÇÇàµÇ°í ÀÖ´ÂÁö È®ÀÎÇÏ¿© ±×·¸Áö ¾ÊÀ¸¸é ½ÇÇà
</p>

<code>
- ½ÇÇàÈ®ÀÎ
  $ /etc/rc.d/init.d/portmap status
 - ½ÇÇà
  $ /etc/rc.d/init.d/portmap start
</code>
<p>
2) dracd ½ÇÇà
  $ /etc/rc.d/init.d/dracd start
  ½ÇÇàÈÄ /etc/mail/¿¡ dracd.dbÈ­ÀÏÀÌ »ý¼ºµÇ¾ú´ÂÁö È®ÀÎ
</p>


<sect>  POP3¼­¹ö, ¼¾µå¸ÞÀÏ Áغñ¿Í Å×½ºÆÃ

<sect1> POP3¼­¹ö Áغñ¿Í Å×½ºÆÃ
<p>
1)  localhostÀÇ pop-3 Æ÷Æ®¿¡ Á¢¼ÓÇÏ¿© pop3ÀÎÁõ°úÁ¤À¸·Î dracd DB¸¦ ¾÷µ¥ÀÌÆ®ÇÑ´Ù.
</p>
<code>
# telnet localhost 110
  Trying 127.0.0.1...
  Connected to localhost.
  Escape character is '^]'.
  +OK QPOP (version 3.1.2) at mail.my.net starting.
  user foo         <--- localhostÀÇ À̸ÞÀÏ °èÁ¤ 
  +OK Password required for foo.
  pass bar        <--- ÆÐ½º¿öµå
  +OK foo has 0 visible messages (0 hidden) in 0 octets.
  quit
  +OK Pop server at mail.my.net signing off.
</code>

<p>
2) /etc/mail/dracd.dbÈ­ÀÏÀÌ ½Ã½ºÅÛ date¿Í ÀÏÄ¡ÇÏ´ÂÁö È®ÀÎ
</p>
<code>
# ls -l /etc/mail/dracd.db
# date
</code>
<p>
3) dracd.db¿¡ IP Address(¿©±â¼± 127.0.0.1)°¡ µî·ÏµÇ¾ú´ÂÁö È®ÀÎ
</p>
<code>
# grep 127.0.0.1 dracd.db
Binary file dracd.db matches   <--- Á¦´ë·Î µî·ÏÀÌ µÇ¾úÀ»¶§ Ãâ·Â ¸Þ¼¼Áö
</code>

<sect1> DRAC°¡ µ¿ÀÛÇÏ°Ô Sendmail ¼¼ÆÃÇϱâ.
<p>
<sect2> DRAC°¡ µ¿ÀÛÇÏ°Ô Sendmail ÀÚµ¿ ¼¼ÆÃÇϱâ.</p>

<p>
À§ÀÇ Optional Package  sendmail-8.11.0-8.i386.rpm Àº drac-enabled sendmail Áï drac
°¡ sendmail¿¡¼­ µ¿ÀÛÇϵµ·Ï ÀÚµ¿À¸·Î sendmail.cf¸¦ ¼³Á¤ÇÑ´Ù. ¼³Ä¡ÈÄ sendmail.cf¸¦ Àç¼³
Á¤ÇØÁÖ¾î¾ß ÇÑ´Ù. ¾Æ·¡¿Í °°ÀÌ µÎ°¡Áö ¹æ¹ýÀ¸·Î ÇÒ ¼ö ÀÖ´Ù.(µÎ°¡ÁöÁß ÇѰ¡Áö ¼±ÅÃ)
</p>
<code>
- À缳ġ
 # rpm -Uvh --force sendmail-.11.0-8.i386.rpm 

- ¾ðÀνºÅçÇϰí À缳ġ
 # rpm -e --nodeps sendmail
 # rpm -Uvh sendmail-.11.0-8.i386.rpm 
 
ÀÚµ¿¼³Ä¡´Â ´ëºÎºÐ Àß ÀÛµ¿ÇÏÁö¸¸ ¸¸¾à Á¦´ë·Î ÀÛµ¿ÇÏÁö ¾ÊÀ¸¸é ¾Æ·¡ÀÇ ¼öµ¿¼³Á¤À» Âü°í
</code>
<p>
 <sect2> ¼öµ¿ sendmail.cf  ¼³Á¤
</p>

<code>
1) /etc/sendmail.cf   È­ÀÏÀ» ¿­¾î ¾Æ·¡ÀÇ ¶óÀÎÀ» local info ¶óÀÎ ¹Ø¿¡ Ãß°¡.

# dynamic relay authorization control map
  Kdrac btree /etc/mail/dracd


2) ¾Æ·¡ÀÇ ³»¿ëÀ»   "SLocal_check_rcpt" ¿¡ Ãß°¡

  # allow recent POP/IMAP mail clients to relay
  R$*                             $: $&{client_addr}
  R$+                             $: $(drac $1 $: ? $)
  R?                              $@ ?
  R$+                             $@ $#OK
ÁÖÀÇ) °ø¹éÀº space°¡ ¾Æ´Ï¶ó tap Ű·Î 

3) sendmail Àç½Ãµ¿
# /etc/rc.d/init.d/sendmail restart

</code>

<sect> sendmail, popper °¡ drac¿Í Àß ÀÛµ¿ÇÏ´ÂÁö  Å×½ºÆ®Çϱâ

<code>
1) Relay°¡ ±ÝÁöµÈ È£½ºÆ®·ÎºÎÅÍ smtp¼­¹ö Á¢¼ÓÇÏ¿© relay °ÅºÎ È®ÀÎ

# telnet mail.my.net 25   <---¸ÞÀϼ­¹öÀÇ ÁÖ¼Ò
  Trying 192.168.1.1...
  Connected to mail.my.net.
  Escape character is '^]'.
  220 mail.my.net ESMTP Sendmail 8.11.0/8.11.0; Tue, 21 Nov 2000 10:56:01 -0600
  helo blah    <-- ±×´ë·Î ½áÁà¾ß ÇÔ.
  250 mail.my.net Hello bofh [192.168.1.2], pleased to meet you
  mail from: bgates@microsoft.com
  250 2.1.0 bgates@microsoft.com... Sender ok
  rcpt to: president@whitehouse.gov
  550 5.7.1 president@whitehouse.gov... Relaying denied  <-- ¸±·¹À̰¡ °ÅºÎµÇ¾ú´Ù.
  quit
  221 2.0.0 mail.my.net closing connection

2)  pop-3·Î Æ÷Æ®·Î Á¢¼ÓÇÏ¿© ¸±·¹ÀÌ ±ÇÇÑ È¹µæÇϱâ

# telnet mail.my.net 110
  Trying 192.168.1.1...
  Connected to mail.my.net.
  Escape character is '^]'.
  +OK QPOP (version 3.1.2) at mail.my.net starting.
  user foo      <--- Smtp ¼­¹öÀÇ ¸ÞÀϾÆÀ̵ð
  +OK Password required for foo.
  pass bar
  +OK foo has 0 visible messages (0 hidden) in 0 octets.  <-- ¸±·¹ÀÌ ±ÇÇÑ È¹µæ
  quit
  +OK Pop server at mail.my.net signing off.

3) ´Ù½Ã smtp Æ÷Æ®·Î Á¢¼ÓÇÏ¿© ¸±·¹À̸¦ ÇÒ ¼ö ÀÖ´ÂÁö È®ÀÎ

  [root@bofh /root]# telnet mail.my.net 25
  Trying 192.168.1.1...
  Connected to mail.my.net.
  Escape character is '^]'.
  220 mail.my.net ESMTP Sendmail 8.11.0/8.11.0; Tue, 21 Nov 2000 10:56:01 -0600
  helo blah
  250 mail.my.net Hello bofh [192.168.1.2], pleased to meet you
  mail from: bgates@microsoft.com
  250 2.1.0 bgates@microsoft.com... Sender ok
  rcpt to: president@whitehouse.gov
  250 2.1.5 president@whitehouse.gov... Recipient ok  <-- ¸±·¹ÀÌ ¼º°ø
  quit
  221 2.0.0 mail.my.net closing connection
</code>

<p>
À§ÀÇ °úÁ¤À» º¸¸é pop-3Æ÷Æ®¿¡ Á¢¼ÓÀ» ÇÏ¿© ¸ÞÀϰèÁ¤ÀÇ ¾ÆÀ̵ð·Î ÀÎÁõ¿¡ ¼º°øÇϸé 
/etc/DRACd.db¿¡ Á¢¼ÓµÇ¾îÁø IP¸¦ ±â·ÏÇÏ¿© ±× IP·Î Á¢¼ÓÇÑ À¯Àú°¡ Relay°¡ °¡´ÉÇϵµ·Ï ÇØÁÖ
°í ÀÖ´Ù. ´Ù½Ã¸»Çϸé Mail Client ÇÁ·Î±×·¥À¸·Î pop-3Æ÷Æ®¿¡ localhost¿¡ ÀÖ´Â ¸ÞÀÏ ¾ÆÀ̵ð
·Î Á¢¼ÓÀ» ¼º°øÇϱ⸸ ÇÏ¸é ¸ÞÀÏ Relay¸¦ °¡´ÉÇÏ°Ô Çϰí ÀÖ´Ù.  µ¿Àû¾ÆÀÌÇǸ¦ °¡Áö°í ÀÖ´Â ¸Þ
ÀÏÀ¯Àú¶ó ÇÒÁö¶óµµ localhost¿¡ ÀÎÁõµÈ ¸ÞÀϰèÁ¤¸¸ ÀÖÀ¸¸é sendmailÀÇ /etc/mail/access¿¡ 
¼³Á¤ÇØÁÖÁö ¾Ê´õ¶óµµ ¾ó¸¶µçÁö Relay¼³Á¤À» µ¿ÀûÀ¸·Î »ý¼ºÇÏ¿© Relay¸¦ °¡´ÉÇÏ°Ô ÇØÁØ´Ù.  
</p>

<p>
Âü°í·Î /etc/DRACd.db¿¡ ±â·ÏµÇ¾îÁø IP data´Â ±âº»À¸·Î 30ºÐÀÇ µ¥ÀÌÅÍÀ¯È¿½Ã°£À» °¡ÁöÁö¸¸ 
<url url="http://mail.cc.umanitoba.ca/drac" name="http://mail.cc.umanitoba.ca/drac">¸¦ »ìÆìº¸¸é ÀÌ À¯È¿½Ã°£À» Á¶ÀýÇÒ ¼ö ÀÖ´Ù.
</p>

<p>
Âü°í·Î ÀÌ DRAC¸¦ ÀÌ¿ëÇØ ¸±·¹ÀÌ °¡´ÉÇÏ°Ô ÇÏ·Á¸é PO3À¯Àú´Â ²À POP3 ¼­¹ö¿¡ Á¢¼ÓÇÏ´Â °ÍÀÌ ¼±ÇàµÇ¾î¾ß ÇÑ´Ù. ¸¸¾à DRAC ÀÎÁõ À¯È¿½Ã°£ÀÌ Á¾·áµÇ¾ú´Ù¸é  Relay °ÅºÎ ¸Þ¼¼Áö¸¦ ¹ÞÀ» °ÍÀÌ´Ù.
</p>

<p>
À̱ÛÀÇ ¿ø¹®Àº ¹ø¿ªµÇ¾îÁø °Í°ú ¾à°£ ´Ù¸£´Ù. Á÷¿ªÀ» ÇÏÁö ¾Ê°í ÀÇ¿ªÀ»
Ç߱⠶§¹®ÀÌ´Ù. ÇÏÁö¸¸ ÀǹÌÀü´Þ¿¡´Â º° Â÷À̰¡ ¾øÀ» ÁÙ ¾È´Ù. ¿ø¹®À» º¸°íÀÚ ÇÏ´Â ºÐÀº
<url url="http://www.ls-l.net/drac/" name="http://www.ls-l.net/drac">À» 
ÂüÁ¶ÇÏ¸é µÈ´Ù.
</p>

</article>





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