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ÀÌÀü ÁÖÁ¦ º¸±â :: ´ÙÀ½ ÁÖÁ¦ º¸±â |
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¿Ã·ÁÁü: 2003.9.29 ¿ù, 12:27 pm ÁÖÁ¦: /var/log/secure¿¡ ÀÖ´Â ·Î±× Çؼ®Á» ºÎŹµå¸³´Ï´Ù. |
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¾È³çÇϼ¼¿ä Ãʺ¸ ¸®´ª¼ÀÔ´Ï´Ù.
´Ã °í¼ö´ÔµéÀÇ µµ¿òÀ» ¹Þ¾Æ Çϳª¾¿ ¹è¿ì°í Àִµ¥¿ä... Á¦°¡ °ü¸®ÇÏ´Â ¼¹ö¿¡ Á¦°¡ ¸ð¸£´Â ·Î±×°¡ »ý°Ü¼ ºÒ¾ÈÇÑ ¸¾¿¡ ±ÛÀ» ¿Ã¸³´Ï´Ù.
°í¼ö´ÔµéÀÌ ¾Ë·ÁÁֽøé Á¤¸» °¨»çÇÏ°Ú½À´Ï´Ù.
Âü°í·Î ¹èÆ÷ÆÇÀº ·¹µåÇÞÀ̱¸¿ä Ä¿³ÎÀº 2.4.18ÀÔ´Ï´Ù.
±×¸®°í ¼¾µå¸ÞÀÏ ¹öÁ¯Àº 8.12.8À̸ç ssh´Â OpenSSH_3.5p1À» »ç¿ëÇÏ°í ÀÖ½À´Ï´Ù.
(ÀÌ»ó·Î±× 1)
Sep 29 11:06:34 xxx-system xinetd[1485]: Bad log_on_failure flag: RECORD [line=15]
Sep 29 11:06:34 xxx-system xinetd[1485]: Error parsing attribute log_on_failure - DISABLING SERVICE [line=15]
Sep 29 11:22:55 xxx-system opensshd[2118]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
(ÀÌ»ó·Î±× 2)
Sep 29 11:00:02 xxx-system sendmail[1016]: h8T202B0001016: [211.205.113.171] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
Sep 29 11:00:15 xxx-system sendmail[1017]: h8T1xxB0001017: ruleset=check_rcpt, arg1=<fedida@free.uk>, relay=[211.217.200.239], reject=550 5.7.1 <fedida@free.uk>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:02:22 xxx-system sendmail[1228]: h8T22LB0001228: ruleset=check_rcpt, arg1=<fervidbk@nacetech.ocm>, relay=[211.217.200.239], reject=550 5.7.1 <fervidbk@nacetech.ocm>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:03:43 xxx-system sendmail[1325]: h8T23gB0001325: [211.217.200.239] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
Sep 29 11:04:18 xxx-system sendmail[1326]: h8T242B0001326: ruleset=check_rcpt, arg1=<fgnejrfg@ylpbf.pb.xe>, relay=[211.217.200.239], reject=550 5.7.1 <fgnejrfg@ylpbf.pb.xe>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:05:50 xxx-system sendmail[1459]: h8T25oB0001459: ruleset=check_rcpt, arg1=<financial@financial.or.kr>, relay=[211.217.200.239], reject=550 5.7.1 <financial@financial.or.kr>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:06:35 xxx-system sendmail[1487]: h8T26ZB0001487: ruleset=check_rcpt, arg1=<finev2@finev2.co.kr>, relay=[211.217.200.239], reject=550 5.7.1 <finev2@finev2.co.kr>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:07:55 xxx-system sendmail[1496]: h8T27sB0001496: ruleset=check_rcpt, arg1=<first@lettuceb.sl>, relay=[211.217.200.239], reject=550 5.7.1 <first@lettuceb.sl>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:08:56 xxx-system sendmail[1499]: h8T28uB0001499: ruleset=check_rcpt, arg1=<fjvm@betvb.arg>, relay=[211.217.200.239], reject=550 5.7.1 <fjvm@betvb.arg>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:09:18 xxx-system sendmail[1500]: h8T298B0001500: ruleset=check_rcpt, arg1=<fkopke@unlinfo.unl.edu>, relay=[211.217.200.239], reject=550 5.7.1 <fkopke@unlinfo.unl.edu>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:10:34 xxx-system sendmail[1627]: h8T2AXB0001627: ruleset=check_rcpt, arg1=<flower@kyungflower.com>, relay=[211.217.200.239], reject=550 5.7.1 <flower@kyungflower.com>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:11:06 xxx-system sendmail[1628]: h8T2B6B0001628: ruleset=check_rcpt, arg1=<flutters@apprehensivenesse.net>, relay=[211.217.200.239], reject=550 5.7.1 <flutters@apprehensivenesse.net>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:11:29 xxx-system sendmail[1634]: h8T2BTB0001634: ruleset=check_rcpt, arg1=<flyrr@onjv.bet>, relay=[211.217.200.239], reject=550 5.7.1 <flyrr@onjv.bet>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:11:59 xxx-system sendmail[1645]: h8T2BbB0001645: ruleset=check_rcpt, arg1=<fmb@formybody.co.kr>, relay=[211.217.200.239], reject=550 5.7.1 <fmb@formybody.co.kr>... Relaying denied. IP name lookup failed [211.217.200.239]
Sep 29 11:14:51 xxx-system sendmail[1723]: h8T2EpB0001723: ruleset=check_rcpt, arg1=<forged@birdiedt.edu>, relay=[61.73.50.252], reject=550 5.7.1 <forged@birdiedt.edu>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:15:59 xxx-system sendmail[1860]: h8T2FkB0001860: ruleset=check_rcpt, arg1=<foster@cs.uidaho.edu>, relay=[61.73.50.252], reject=550 5.7.1 <foster@cs.uidaho.edu>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:16:42 xxx-system sendmail[1874]: h8T2GfB0001874: ruleset=check_rcpt, arg1=<fpottere@vmsa.oac.uci.edu>, relay=[61.73.50.252], reject=550 5.7.1 <fpottere@vmsa.oac.uci.edu>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:16:59 xxx-system sendmail[1875]: h8T2GnB0001875: ruleset=check_rcpt, arg1=<fqwmvp@kjdfsindyljksdf.net>, relay=[61.73.50.252], reject=550 5.7.1 <fqwmvp@kjdfsindyljksdf.net>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:17:05 xxx-system sendmail[1883]: h8T2H5B0001883: ruleset=check_rcpt, arg1=<francesc@telcen.caen.it>, relay=[61.73.50.252], reject=550 5.7.1 <francesc@telcen.caen.it>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:18:40 xxx-system sendmail[1893]: h8T2IMB0001893: ruleset=check_rcpt, arg1=<fred@bbn-unix.arpa>, relay=[61.73.50.252], reject=550 5.7.1 <fred@bbn-unix.arpa>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:18:55 xxx-system sendmail[1902]: h8T2ItB0001902: ruleset=check_rcpt, arg1=<freedom@cham.jinbo.net>, relay=[61.73.50.252], reject=550 5.7.1 <freedom@cham.jinbo.net>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:19:29 xxx-system sendmail[1920]: h8T2JSB0001920: ruleset=check_rcpt, arg1=<freib@uvgry.arg>, relay=[61.73.50.252], reject=550 5.7.1 <freib@uvgry.arg>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:19:57 xxx-system sendmail[1923]: h8T2JgB0001923: ruleset=check_rcpt, arg1=<freraqvc77@ubgznvy.pbz>, relay=[61.73.50.252], reject=550 5.7.1 <freraqvc77@ubgznvy.pbz>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:20:21 xxx-system sendmail[2067]: h8T2KKB0002067: ruleset=check_rcpt, arg1=<friends@cybermail.com>, relay=[61.73.50.252], reject=550 5.7.1 <friends@cybermail.com>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:22:05 xxx-system sendmail[2093]: h8T2LoB0002093: ruleset=check_rcpt, arg1=<fsu-request@sovset.org>, relay=[61.73.50.252], reject=550 5.7.1 <fsu-request@sovset.org>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:22:43 xxx-system sendmail[2110]: h8T2MhB0002110: ruleset=check_rcpt, arg1=<ftp@ftp.segaoa.com>, relay=[61.73.50.252], reject=550 5.7.1 <ftp@ftp.segaoa.com>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:23:08 xxx-system sendmail[2116]: h8T2MvB0002116: ruleset=check_rcpt, arg1=<ftpadm@ftp.sayclub.com>, relay=[61.73.50.252], reject=550 5.7.1 <ftpadm@ftp.sayclub.com>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:23:25 xxx-system sendmail[2122]: h8T2NCB0002122: ruleset=check_rcpt, arg1=<ftpadmin@power.vi.uv.es>, relay=[61.73.50.252], reject=550 5.7.1 <ftpadmin@power.vi.uv.es>... Relaying denied. IP name lookup failed [61.73.50.252]
Sep 29 11:25:08 xxx-system sendmail[2280]: h8T2P8B0002280: ruleset=check_rcpt, arg1=<fusfuvhswurf@fkvnedubg.com>, relay=[61.73.50.252], reject=550 5.7.1 <fusfuvhswurf@fkvnedubg.com>... Relaying denied. IP name lookup failed [61.73.50.252]
ÀÌ»ó·Î±× 1ÀÇ °æ¿ì ssh¸¦ xinetd·Î ¿î¿µÇϴµ¥ xinetd¸¦ ¸®½ºÅ¸Æ® ÇßÀ» °æ¿ì¿¡ ¹ß»ýÇÏ°í ¼³Á¤ÆÄÀÏÀ» »ìÆ캸¾ÒÁö¸¸ º°´Ù¸¥ ¹®Á¦Á¡À» ¹ß°ßÇÏÁö ¸øÇß½À´Ï´Ù.
xinetdÀÇ ¼³Á¤Àº ¾Æ·¡¿Í °°½À´Ï´Ù.
1 # default: off
2 # description: OpenSSH server daemon For XINETD
3 service ssh
4 {
5 disable = no
6 flags = REUSE
7 protocol = tcp
8 socket_type = stream
9 instances = 50
10 wait = no
11 user = root
12 server = /usr/sbin/opensshd
13 server_args = -i
14 log_on_success = HOST PID
15 log_on_failure = HOST RECORD
16 }
ÀÌ»ó·Î±× 2¹ø°´Â ´©±º°¡ ¸ÞÀϼ¹ö¸¦ ¹«´ÜÀ¸·Î »ç¿ëÇÏ·Á´Â °Í °°Àºµ¥
ÀÌ·¸°Ô 󸮵Ǵ °ÍÀÌ Á¤»óÀÎÁö ¾Æ´Ï¸é º¸¾È»ó ¹®Á¦°¡ ÀÖ´Â °ÍÀÎÁö ¸ð¸£°Ú½À´Ï´Ù.
±×¸®°í ÇØ´ç IPÀÇ °æ·Î¸¦ ÃßÀûÇغ¸¸é ¿Ü±¹ÀÇ °æ¿ìµµ ÀÖÁö¸¸ ±¹³»ÀÇ ipµµ »ó´ç¼ö ¹ß°ßÇÒ ¼ö ÀÖ¾ú½À´Ï´Ù.
¸¸¾à ±¹³»ÀÏ °æ¿ì ÀÌ·¯ÇÑ °ÍÀ» ¹æÁöÇÒ ¼ö ÀÖµµ·Ï °æ°í³ª ±âŸ ºÒÀÌÀÍÀ» ÁÙ ¼ö ÀÖ´Â ¹æ¹ýÀÌ ÀÖÀ»±î¿ä??
¿¹¸¦ µé¸é ¾Æ·¡¿Í °°Àº Á¤º¸¸¦ ãÀ» ¼ö ÀÖ¾ú½À´Ï´Ù.
ÇØ´çip´Â 61.73.50.252¿´½À´Ï´Ù.
[whois.apnic.net node-1]
Whois data copyright terms http://www.apnic.net/db/dbcopyright.html
inetnum: 61.72.0.0 - 61.77.255.255
netname: KORNET
descr: KOREA TELECOM
descr: KOREA TELECOM Internet Operating Center
country: KR
admin-c: DL276-AP
tech-c: WK81-AP
remarks: ******************************************
remarks: Allocated to KRNIC Member.
remarks: If you would like to find assignment
remarks: information in detail please refer to
remarks: the KRNIC Whois Database at:
remarks: http://whois.nic.or.kr/english/index.html
remarks: ******************************************
mnt-by: MNT-KRNIC-AP
mnt-lower: MNT-KRNIC-AP
changed: hostmaster@apnic.net 20001212
changed: hostmaster@apnic.net 20010627
status: ALLOCATED PORTABLE
source: APNIC
person: Dongjoo Lee
address: Korea Telecom
address: 128-9 Youngundong Chongroku
address: SEOUL
address: 463-711
country: KR
phone: +82-2-747-9213
fax-no: +82-2-766-5901
e-mail: ip@ns.kornet.net
nic-hdl: DL276-AP
mnt-by: MNT-KRNIC-AP
changed: hostmaster@nic.or.kr 20010523
source: APNIC
person: Won Kang
address: Korea Telecom
address: 128-9 Youngundong Chongroku
address: SEOUL
address: 463-711
country: KR
phone: +82-2-747-9213
fax-no: +82-2-766-5901
e-mail: ip@ns.kornet.net
nic-hdl: WK81-AP
mnt-by: MNT-KRNIC-AP
changed: hostmaster@nic.or.kr 20010523
source: APNIC
inetnum: 61.73.42.0 - 61.73.54.255
netname: KORNET-XDSL-SINCHON-KR
descr: SINCHON NODE
descr: 157-1 DONGKYODONG MAPOKU
descr: SEOUL
descr: 121-200
country: KR
admin-c: GP25-KR
tech-c: WK30-KR
remarks: This IP address space has been allocated to KRNIC.
remarks: For more information, using KRNIC Whois Database
remarks: whois -h whois.nic.or.kr
mnt-by: MNT-KRNIC-AP
remarks: This information has been partially mirrored by APNIC from
remarks: KRNIC. To obtain more specific information, please use the
remarks: KRNIC whois server at whois.krnic.net.
changed: hostmaster@nic.or.kr 20030915
source: KRNIC
person: GilSoon Park
descr: KOREA TELECOM
descr: 128-9 Youngundong Chongroku
descr: SEOUL
descr: 110-460
country: KR
phone: +82-2-747-9213
fax-no: +82-2-766-5901
e-mail: gspark@kornet.net
nic-hdl: GP25-KR
mnt-by: MNT-KRNIC-AP
remarks: This information has been partially mirrored by APNIC from
remarks: KRNIC. To obtain more specific information, please use the
remarks: KRNIC whois server at whois.krnic.net.
changed: hostmaster@nic.or.kr 20030915
source: KRNIC
person: Won Kang
descr: KOREA TELECOM
descr: 128-9 Youngundong Chongroku
descr: SEOUL
descr: 110-460
country: KR
phone: +82-2-747-9213
fax-no: +82-2-766-5901
e-mail: ip@ns.kornet.net
nic-hdl: WK30-KR
mnt-by: MNT-KRNIC-AP
remarks: This information has been partially mirrored by APNIC from
remarks: KRNIC. To obtain more specific information, please use the
remarks: KRNIC whois server at whois.krnic.net.
changed: hostmaster@nic.or.kr 20030915
source: KRNIC
±×·³ ¿À´Ãµµ °í¼ö´ÔµéÀÇ µûµíÇÑ Á¶¾ðÀ» ±â´Ù¸®°Ú½À´Ï´Ù.
ÁÁÀº ÇÏ·ç µÇ¼¼¿ä. |
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truefeel Ä«Æä °ü¸®ÀÚ
°¡ÀÔ: 2003³â 7¿ù 24ÀÏ ¿Ã¸° ±Û: 1277 À§Ä¡: ´ëÇѹα¹
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¿Ã·ÁÁü: 2003.9.29 ¿ù, 2:12 pm ÁÖÁ¦: Re: /var/log/secure¿¡ ÀÖ´Â ·Î±× |
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Anonymous ¾¸: |
Âü°í·Î ¹èÆ÷ÆÇÀº ·¹µåÇÞÀ̱¸¿ä Ä¿³ÎÀº 2.4.18ÀÔ´Ï´Ù.
±×¸®°í ¼¾µå¸ÞÀÏ ¹öÁ¯Àº 8.12.8À̸ç ssh´Â OpenSSH_3.5p1À» »ç¿ëÇÏ°í ÀÖ½À´Ï´Ù.
(ÀÌ»ó·Î±× 1)
Sep 29 11:06:34 xxx-system xinetd[1485]: Bad log_on_failure flag: RECORD [line=15]
Sep 29 11:06:34 xxx-system xinetd[1485]: Error parsing attribute log_on_failure - DISABLING SERVICE [line=15]
Sep 29 11:22:55 xxx-system opensshd[2118]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
(ÀÌ»ó·Î±× 2)
Sep 29 11:00:02 xxx-system sendmail[1016]: h8T202B0001016: [211.205.113.171] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
Sep 29 11:00:15 xxx-system sendmail[1017]: h8T1xxB0001017: ruleset=check_rcpt, arg1=<fedida@free.uk>, relay=[211.217.200.239], reject=550 5.7.1 <fedida@free.uk>... Relaying denied. IP name lookup failed [211.217.200.239]
ÀÌ»ó·Î±× 1ÀÇ °æ¿ì ssh¸¦ xinetd·Î ¿î¿µÇϴµ¥ xinetd¸¦ ¸®½ºÅ¸Æ® ÇßÀ» °æ¿ì¿¡ ¹ß»ýÇÏ°í ¼³Á¤ÆÄÀÏÀ» »ìÆ캸¾ÒÁö¸¸ º°´Ù¸¥ ¹®Á¦Á¡À» ¹ß°ßÇÏÁö ¸øÇß½À´Ï´Ù.
xinetdÀÇ ¼³Á¤Àº ¾Æ·¡¿Í °°½À´Ï´Ù.
1 # default: off
2 # description: OpenSSH server daemon For XINETD
3 service ssh
4 {
5 disable = no
6 flags = REUSE
7 protocol = tcp
8 socket_type = stream
9 instances = 50
10 wait = no
11 user = root
12 server = /usr/sbin/opensshd
13 server_args = -i
14 log_on_success = HOST PID
15 log_on_failure = HOST RECORD
16 }
ÀÌ»ó·Î±× 2¹ø°´Â ´©±º°¡ ¸ÞÀϼ¹ö¸¦ ¹«´ÜÀ¸·Î »ç¿ëÇÏ·Á´Â °Í °°Àºµ¥
ÀÌ·¸°Ô 󸮵Ǵ °ÍÀÌ Á¤»óÀÎÁö ¾Æ´Ï¸é º¸¾È»ó ¹®Á¦°¡ ÀÖ´Â °ÍÀÎÁö ¸ð¸£°Ú½À´Ï´Ù.
±×¸®°í ÇØ´ç IPÀÇ °æ·Î¸¦ ÃßÀûÇغ¸¸é ¿Ü±¹ÀÇ °æ¿ìµµ ÀÖÁö¸¸ ±¹³»ÀÇ ipµµ »ó´ç¼ö ¹ß°ßÇÒ ¼ö ÀÖ¾ú½À´Ï´Ù.
¸¸¾à ±¹³»ÀÏ °æ¿ì ÀÌ·¯ÇÑ °ÍÀ» ¹æÁöÇÒ ¼ö ÀÖµµ·Ï °æ°í³ª ±âŸ ºÒÀÌÀÍÀ» ÁÙ ¼ö ÀÖ´Â ¹æ¹ýÀÌ ÀÖÀ»±î¿ä??
¿¹¸¦ µé¸é ¾Æ·¡¿Í °°Àº Á¤º¸¸¦ ãÀ» ¼ö ÀÖ¾ú½À´Ï´Ù.
ÇØ´çip´Â 61.73.50.252¿´½À´Ï´Ù.
[whois.apnic.net node-1]
....
inetnum: 61.73.42.0 - 61.73.54.255
netname: KORNET-XDSL-SINCHON-KR
descr: SINCHON NODE
....
|
1. ssh ¹®Á¦
log_on_failureÀÇ RECORD°ªÀ» ssh¿¡¼µµ ¾µ ¼ö ÀÖ´Â °ÍÀÎÁö È®ÀÎÀ» Çغ¸±¸¿ä,
ÀÏ´Ü RECORD¸¦ »©º¸¼¼¿ä. RECORD´Â ½ÇÆнà ¸®¸ðÆ®»ç¿ëÀÚ Á¤º¸¿Í Å͹̳ΠŸÀÔ Á¤º¸¸¦
Ãß°¡·Î ±â·ÏÇϱâ À§ÇÑ °ÍÀÔ´Ï´Ù.
error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
ÀÌ °ÍÀº ÀÌ¹Ì sshd µ¥¸óÀÌ µ¿ÀÛÁßÀε¥ Àç½ÇÇàÇÑ °æ¿ìÀÔ´Ï´Ù.
xinetd¸¦ ÅëÇؼµµ sshd¸¦ ½ÇÇàÇÏ°í
standaloneÀ¸·Î sshd¸¦ µ¿½Ã¿¡ µ¹¸®·Á ÇÏ´Â °Í °°½À´Ï´Ù.
netstat -atnpÇؼ Local AddressÄ÷³¿¡ 0.0.0.0:22 ÀÌ ÀÖ´Â ÁÙÀ» »ìÆ캸¼¼¿ä.
ÁÙ ³¡¿¡
1111/sshd¶ó°í ³ª¿À¸é sshd°¡ xinetd¿Í ¹«°üÇÏ°Ô µ¶¸³ÀûÀ¸·Î µ¿ÀÛÁßÀÓÀ» ÀǹÌÇÕ´Ï´Ù.
1111/xinetd¶ó°í ³ª¿À¸é xinetd¸¦ ÅëÇؼ ½ÇÇàÇÏ´Â °ÍÀÔ´Ï´Ù.
±×¸®°í opensshd¸¦ ÃÖ±Ù¿¡ ¾÷µ¥ÀÌÆ® ÇÑÀû ÀÖÀ¸½Å°¡¿ä? ¾ø´Ù¸é
http://coffeenix.net/bbs/viewtopic.php?t=99 ¸¦ º¸°í ¾÷µ¥ÀÌÆ®¸¦ Çغ¸¼¼¿ä. 3.5p1À» »ç¿ëÇϸé
·¹µåÇÞ 9¸¦ »ç¿ëÇÏ½Ç µí.
¸¶Âù°¡Áö·Î up2date¸¦ ÀÌ¿ëÇؼ ´Ù¸¥ ÆÐÅ°Áöµéµµ ¾÷µ¥ÀÌÆ® ÇϽñæ..
2. sendmail ·Î±×
¿ÜºÎ¿¡¼ ´ÔÀÇ ¼¹ö¸¦ ÀÌ¿ëÇؼ ¸ÞÀÏÀ» º¸³»·Á ÇÕ´Ï´Ù¸¸(¸ÞÀϸ±·¹ÀÌ) ¼¹ö¿¡¼´Â
Á¤»óÀûÀ¸·Î rejectÇß½À´Ï´Ù. ¼³Á¤Àº Á¦´ë·Î µÆ´Ù´Â °ÍÀÔ´Ï´Ù.
* Âü°íÇÒ ¸¸ÇÑ ÀÚ·á :
http://www.certcc.or.kr/paper/tr2001/tr2001-06/spam_relay_test.pdf
ÀÏÀÏÈ÷ Àú IP¿¡ ´ëÇØ whois °Ë»öÇÏ¿© ÇØ´ç ´ã´çÀÚ¿¡°Ô ¸ÞÀÏÀ» º¸³»´Â°Ô ½±Áö°¡ ¾Ê½À´Ï´Ù.
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