5. °£´ÜÇÑ µµ¸ÞÀÎ

µµ¸ÞÀÎ ±¸Ãà ¹æ¹ý.

5.1. 5.1 ¿ì¼±Àº »óÅõÀûÀÎ À̷кÎÅÍ

¿ì¼±ÀûÀ¸·Î ÀÌÀü¿¡ ´Ù¸¥ ¿©·¯ °ü·Ã¼­ÀûÀ» ÀÐ°í ¼÷ÁöÇߴ°¡? ±×·¡¾ß¸¸ÇÑ´Ù.

ÀÌ ÀåÀ» ½ÃÀÛÇϱâ Àü¿¡ DNS°¡ ±¸µ¿µÇ´Â ¾à°£ÀÇ À̷п¡ ´ëÇØ ¼³¸íÇϱâ·Î ÇÑ´Ù. ±×¸®°í ÀÌ ÀåÀ»Àд°ÍÀÌ ÁÁ´Ù. Àб⠽ÈÀ¸¸é Àû¾îµµ named.conf°¡ ³ª¿À±â Àü±îÁö ¼Óµ¶ÀÌ¶óµµ Ç϶ó.

DNS´Â tree±¸Á¶·Î µÇÀÖ´Â °èÃþ±¸Á¶ÀÌ´Ù. ÀϹÝÀûÀÎ treeµ¥ÀÌÅÍ-±¸Á¶¿¡¼­ »óÀ§´Â '.' À¸·Î µÇ¾î ÀÖ°í À̰ÍÀº 'root'·Î ´Ù½Ã ºÒ¸®¿ö Áø´Ù. '.' ¾Æ·¡¿¡´Â ¼ö¸¹Àº ÃÖ»óÀ§ µµ¸ÞÀεéÀÌ ÀÖ´Ù(TLDs:Top Level Domains);°¡Àå Àß ¾Ë·ÁÁø °ÍÀº ORG, COM, EDU, NET µîÀÌ ÀÖ´Ù. ³ª¹«Ã³·³ »Ñ¸®(root)µµ ÀÖ°í °¡Áö(branch)µµ ÀÖ´Ù°í »ý°¢ÇÏÀÚ. ÄÄÇ»ÅͰúÇп¡ ´ëÇÑ Áö½ÄÀÌ ÀÖ´Ù¸é DNS¸¦ treeºÎºÐ, ¸¶µð, ÀÙ¸¶µð, ºÀ¿ì¸®·Î ÀνÄÇÏ°Ô µÉ °ÍÀÌ´Ù. Á¡(.)ÀÌ ºÐ±âÁ¡ÀÌ°í ºÀ¿ì¸®°¡ À̸§µéÀÌ´Ù.

ÁúÀÇ´Â root·Î ºÎÅÍ ½ÃÀ۵Ǵ ±¸Á¶¿¡ ´ëÇØ¼­ ¼øÈ¯ÀûÀ¸·Î ÁøÇàµÈ´Ù. prep.ai.mit.edu. À̶ó´Â ÁÖ¼Ò¸¦ ãÀ¸·Á ÇÑ´Ù¸é ³×ÀÓ¼­¹ö´Â ¾îµò°¡¿¡ ÁúÀǸ¦ ÇÒ°ÍÀÌ´Ù. ¿ì¼±Àº ij½¬¿¡¼­ºÎÅÍ ÁúÀǸ¦ ÇÑ´Ù. ij½¬°¡ ´äÀ» °¡Áö°í ÀÖ°í ´äº¯ÀÌ ¿À°Ô µÈ´Ù¸é ¹Ù·Î Àü Àå¿¡¼­¿Í °°Àº °á°ú¸¦ º¸°Ô µÉ °ÍÀÌ´Ù.¿©±â¿¡¼­ ´äÀÌ ³ª¿ÀÁö ¾ÊÀ¸¸é À̸§ÀÌ ½ÃÀ۵Ǵ ¿ÞÂʺÎÅÍ Áö¿ö ³ª°¡°Ô µÈ´Ù. ai.mit.edu. ±×¸®°í´Â mit.edu. ¶Ç ±×¸®°í edu.¸¦ ³×ÀÓ¼­¹ö°¡ ¾Ë°í ÀÖ´ÂÁö È®ÀÎÇϰí, ¸ð¸¥´Ù¸é. ¿¡°Ô ÁúÀǸ¦ ÇÏ°Ô µÈ´Ù. . Àº hintsÆÄÀÏÀ» °¡¸£Å°±â ¶§¹®ÀÌ´Ù. ±×·¯¸é . ¼­¹öµéÀº prep.ai.mit.edu ¿¡ ´ëÇØ ÁúÀǸ¦ ÇÏ°Ô µÇ¸ç, prep.ai.mit.edu ¼­¹ö°¡ ´äÀ» ¸ð¸£´õ¶óµµ ´Ù¸¥ °÷ ¾îµð¸¦ ã¾Æ¾ß ÇÒÁö¸¦ ´ç½ÅÀÇ ¼­¹ö¿¡ ¾Ë·ÁÁÖ°í, ã¾Æ°£ °÷¿¡¼­ ÁúÀÇ¿¡ ´ëÇÑ ´äÀ» ¾ò°Ô µÈ´Ù. ÀÌ·¯ÇÑ °ÍÀ» ÀÌÁ¦ º¸¿©ÁÙ °ÍÀÌ´Ù. dig¿¡¼­ +norec´Â ºñ¼øÈ¯ÀûÀÎ ÁúÀǸ¦ º¸³»¼­ ¿ì¸®¿¡°Ô µ¹¾Æ¿Â °ª¸¸À» ¾ò°Ô µÈ´Ù.ÀÌ ¿É¼ÇÀº dig °úÁ¤À» ÁÙÀÌ°í ÆäÀÌÁö ¼ö¸¦ ÁÙÀϰÍÀÌ´Ù. (ÁúÀÇ º¸³»°í ´Ù½Ã ÁúÀǸ¦ ã´Â ½ÄÀÇ ¼øÈ¯ÀÌ ¾Æ´Ï¶ó ÁúÀÇ Çѹø¿¡ °á°ú ÇѹøÀ» º¸¿©Áشٴ Àǹ̷ΠÀÌÇØµË´Ï´Ù.^^;)

$ dig +norec +noH +noques +nostats +nocmd prep.ai.mit.edu.
;; res options: init defnam dnsrch
;; got answer:
; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 13
;; AUTHORITY SECTION:
.                       5d23h48m47s IN NS  I.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  E.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  D.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  A.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  H.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  C.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  G.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  F.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  B.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  J.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  K.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  L.ROOT-SERVERS.NET.
.                       5d23h48m47s IN NS  M.ROOT-SERVERS.NET.

;; ADDITIONAL SECTION:
I.ROOT-SERVERS.NET.     6d23h48m47s IN A  192.36.148.17
E.ROOT-SERVERS.NET.     6d23h48m47s IN A  192.203.230.10
D.ROOT-SERVERS.NET.     6d23h48m47s IN A  128.8.10.90
A.ROOT-SERVERS.NET.     6d23h48m47s IN A  198.41.0.4
H.ROOT-SERVERS.NET.     6d23h48m47s IN A  128.63.2.53
C.ROOT-SERVERS.NET.     6d23h48m47s IN A  192.33.4.12
G.ROOT-SERVERS.NET.     6d23h48m47s IN A  192.112.36.4
F.ROOT-SERVERS.NET.     6d23h48m47s IN A  192.5.5.241
B.ROOT-SERVERS.NET.     6d23h48m47s IN A  128.9.0.107
J.ROOT-SERVERS.NET.     6d23h48m47s IN A  198.41.0.10
K.ROOT-SERVERS.NET.     6d23h48m47s IN A  193.0.14.129
L.ROOT-SERVERS.NET.     6d23h48m47s IN A  198.32.64.12
M.ROOT-SERVERS.NET.     6d23h48m47s IN A  202.12.27.33

°¡À̵å¶óÀθ¸(referral) µé¾î¿Ô´Ù. ¿ì¸®¿¡°Ô "AUTHORITY SECTION(ÀÎÁõ ¼½¼Ç)"¸¸À» ÁÖ°í "Answer Section(ÀÀ´ä¼½¼Ç)"Àº ÁÖÁö ¾Ê¾Ò´Ù. ¿ì¸® ³×ÀÓ¼­¹ö°¡ ÇϳªÀÇ ³×ÀÓ¼­¹ö¸¦ ¼±ÅÃÇÒ °ÍÀÌ´Ù. ¾Æ¹«°Å³ª Áý¾îº¸ÀÚ.(ÃßõµÈ ¼­¹öÁß Çϳª¸¦ Áý¾î³»¼­ ´Ù½Ã ÁúÀǸ¦ º¸³»ÀÚ´Â À̾߱â°ÚÁ®...)

$ dig +norec +noH +noques +nostats +nocmd prep.ai.mit.edu. @H.ROOT-SERVERS.NET.
; (1 server found)
;; res options: init defnam dnsrch
;; got answer:
; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 3
;; AUTHORITY SECTION:
MIT.EDU.                2D IN NS        BITSY.MIT.EDU.
MIT.EDU.                2D IN NS        STRAWB.MIT.EDU.
MIT.EDU.                2D IN NS        W20NS.MIT.EDU.

;; ADDITIONAL SECTION:
BITSY.MIT.EDU.          2D IN A         18.72.0.3
STRAWB.MIT.EDU.         2D IN A         18.71.0.151
W20NS.MIT.EDU.          2D IN A         18.70.0.160

ÀÌÁ¦ ¿ì¸®¿¡°Ô MIT.EDU¸¦ ¼±ÅÃÇÒ ¼ö ÀÖ´Ù. ´Ù½Ã Çϳª Áý¾î³» º¸ÀÚ.

$ dig +norec +noH +noques +nostats +nocmd prep.ai.mit.edu. @bitsy.mit.edu
; (1 server found)
;; res options: init defnam dnsrch
;; got answer:
; flags: qr ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; ANSWER SECTION:
prep.ai.mit.edu.        3h50m7s IN A    198.186.203.18

;; AUTHORITY SECTION:
AI.MIT.EDU.             6H IN NS        FEDEX.AI.MIT.EDU.
AI.MIT.EDU.             6H IN NS        LIFE.AI.MIT.EDU.
AI.MIT.EDU.             6H IN NS        ALPHA-BITS.AI.MIT.EDU.
AI.MIT.EDU.             6H IN NS        BEET-CHEX.AI.MIT.EDU.

;; ADDITIONAL SECTION:
FEDEX.AI.MIT.EDU.       6H IN A         192.148.252.43
LIFE.AI.MIT.EDU.        6H IN A         128.52.32.80
ALPHA-BITS.AI.MIT.EDU.  6H IN A         128.52.32.5
BEET-CHEX.AI.MIT.EDU.   6H IN A         128.52.32.22

ÀÌÁ¦ "Answer Section"À» ¾ò¾ú°í, ¿ì¸®´Â ÁúÀÇ¿¡ ´ëÇÑ ´äÀ» ¾ò°Ô µÇ¾ú´Ù. "AUTHORITY SECTION"Àº ¾î´À ¼­¹ö¿¡ ai.mit.edu¸¦ ´ÙÀ½¿¡ ¹°¾î¾ß ÇÏ´Â Áö¿¡ ´ëÇÑ Á¤º¸¸¦ °¡Áö°í ÀÖ´Ù. ±×·¡¼­ ¹Ù·Î ´ÙÀ½¿¡ ai.mit.edu¸¦ ¹°¾îº¼ ¼ö ÀÖ°Ô µÈ´Ù.

. ¿¡¼­ºÎÅÍ Ãâ¹ßÇØ¼­ ¿ì¸®´Â °¢ µµ¸ÞÀÎ ³×ÀÓÀÇ ·¹º§¿¡¼­ ³×ÀÓ¼­¹ö¸¦ ¼º°øÀûÀ¸·Î ¹ß°ßÇØ ³»¾ú´Ù. ´Ù¸¥ ¼­¹ö¸¦ »ç¿ëÇÏÁö ¾Ê°í ¿©·¯ºÐÀÇ DNS¼­¹ö¸¦ »ç¿ëÇß´Ù¸é ´ç¿¬È÷ ±× Á¤º¸¸¦ ij½¬¿¡ ÀúÀåÇØ µÑ °ÍÀÌ°í ´çºÐ°£Àº ´Ù½Ã ¹¯Áö ¾ÊÀ» °ÍÀÌ´Ù.

ÀÌ Æ®¸®±¸Á¶¿¡¼­ À̸§¾È¿¡ ÀÖ´Â "." µéÀº ºÐ±âÁ¡ÀÌ´Ù. ±×¸®°í "."Á¡µé »çÀÌÀÇ ºÎºÐÀº ÀÌ Æ®¸®±¸Á¶¿¡¼­ °³º°ÀûÀ¸·Î ºÐ±âµÇ´Â ºÎºÐÀÌ´Ù. ¿ì¸®°¡ ¿øÇÏ´Â À̸§À» (prep.ai.mit.edu) ã±â À§Çؼ­ Æ®¸®±¸Á¶¸¦ º¸¸é ¿ì¼± ij½¬¿¡ ÀÖ´Â Á¤º¸³ª ¾Æ´Ï¸é »Ñ¸®(.)¿¡°Ô ¾î´À ¼­¹ö°¡ prep.ai.mit.edu·Î °¡´Â ½ÃÀÛÁ¡(¿øº»Àº father¶ó´Â µ¿»ç¸¦ ¾¹´Ï´Ù.¿ø·ù... ±Ù¿ø...)ÀÎÁö¸¦ ¹°¾îº»´Ù. ij½¬¿¡ Á¤º¸°¡ ¾øÀ¸¸é ¹ÛÀ¸·Î ³ª°¡¼­ ±× À̸§¿¡ ´ëÇÑ Á»´õ °¡±î¿î ÈùÆ®(referral,ÁöÁ¤µÈ ¼­¹ö¶ó°í ¹ø¿ªµÇ´Âµ¥ ÈùÆ®°¡ ´õ Àû´çÇÒ ¼ö ÀÖ°Ú½À´Ï´Ù.)¸¦ ¾ò±â À§ÇØ Àç±ÍÀûÀ¸·Î °è¼ÓÇØ¼­ ¼­¹öµé¿¡°Ô Áú¹®À» ÇÏ°Ô µÈ´Ù.

ÀÚÁÖ À̾߱⠵ÇÁö´Â ¾ÊÁö¸¸ Áß¿äÇÑ µµ¸ÞÀÎÀÌ in-addr.arpa ÀÌ´Ù. 'ÀϹÝ'µµ¸ÞÀΰú À¯»çÇÏ´Ù. in-addr.arpa´Â ¿ì¸®°¡ ÁÖ¼Ò¸¦ ¾Ë°í ÀÖÀ» °æ¿ì¿¡ ±× À̸§À» ¾Ë·ÁÁØ´Ù. ¼÷ÁöÇØ¾ß ÇÒ Áß¿äÇÑ ºÎºÐÀº ip ÁÖ¼Ò°¡ in-addr.arpa µµ¸ÞÀο¡¼­´Â °Å²Ù·Î »ç¿ëµÈ´Ù´Â °ÍÀÌ´Ù. ¸¸¾à¿¡ ÁÖ¼Ò 192.148.52.43À» ¾Ë°í ÀÖ´Ù°í ÇÏÀÚ. ±×·¯¸é prep.ai.mit.edu ¿¹¿¡¼­ Çß´ø °Í°ú °°Àº ½ÄÀ¸·Î ÁøÇàÀÌ µÈ´Ù. ¸ÕÀú arpa. ¼­¹ö¸¦ ã°í in-addr.arpa. ¼­¹ö¸¦ ã°ÔµÈ´Ù. ±×¸®°í ³ª¼­ 192.in-addr.arpa. ·Î, 148.192.in-addr.arpa. ·Î, 52.148.192.in-addr.arpa. ¼­¹ö·Î ÇØ¼­ 43.52.148.192.in-addr.arpa.¼­¹ö¸¦ ã°ÔµÈ´Ù. ¿µ¸®ÇÏÁö ¾ÊÀº°¡? (±×·¸´Ù°í ´ë´äÇ϶ó°í ¿ø¹®Àº °­¿äµµ ÇÑ´Ù.-.-) ¼ýÀÚ¸¦ µÚÁý¾î ³õÀº °ÍÀÌ ´Ù¼Ò°£Àº È¥¶õ½º·¯¿ï °ÍÀÌ´Ù.)

5.2. ÀÚ½ÅÀÇ µµ¸ÞÀÎ

ÀÌÁ¦ ¿ì¸® µµ¸ÞÀÎÀ» Á¤ÀÇÇØ º¸ÀÚ. ¿ì¸®´Â linux.bogus¶ó´Â µµ¸ÞÀÎÀ» °¡Áö°í ¿ì¸® ¼­¹ö¿¡ ¸¸µé¾î ³õÀ» °ÍÀÌ´Ù. ³ª´Â ÀÌ·¯ÇÑ °ÍÀÌ ¿ÜºÎ·Î ½ÇÁ¦ ³ª°¡Áö ¾Ê°Ô °¡Â¥ µµ¸ÞÀÎ À̸§À» ¾µ °ÍÀÌ´Ù.

½ÃÀÛÀü¿¡ Çϳª ¾Ë¾ÆµÖ¾ß ÇÑ´Ù. ¸ðµç ¹®ÀÚ°¡ ´Ù µµ¸ÞÀÎÀÌ µÇ´Â °ÍÀº ¾Æ´Ï´Ù. Á¦ÇÑÀûÀ¸·Î ¿µ¾î ¾ËÆÄºªÀÌ ¾²ÀδÙ.: a-z, 0-9, ±×¸®°í '-'(´ë½¬)°¡ »ç¿ëµÈ´Ù. ´ë¼Ò¹®ÀÚ´Â ±¸º°ÀÌ ¾ø´Ù´Â Á¡µµ ¾Ë¾Æ µÎ±â¸¦. ±×·¡¼­ pat.uio.no ´Â Pat.UiO.No ¿Í °°ÀÌ ¾²ÀδÙ.

¿ì¸®´Â ÀÌ¹Ì named.conf¿¡¼­ ÀÌ ºÎºÐÀ» Çß¾ú´Ù.:

zone "0.0.127.in-addr.arpa" {
	type master;
	file "pz/127.0.0";
};

ÀÌ ÆÄÀÏ¿¡¼­´Â µµ¸ÞÀÎ ³×ÀÓÀÇ ¸¶Áö¸·¿¡ '.'ÀÌ ¾ø´Ù´Â »ç½ÇÀ» ÁÖÀÇÇØ¶ó. ÀÌ ºÎºÐÀº ¿ì¸®°¡ 0.0.127.in-addr.arpa Á¸¿¡ ´ëÇÑ Á¤ÀÇÀÌ°í ¸¶½ºÅÍ ¼­¹ö¿¡ ´ëÇÑ Á¤Àǰ¡ ÀÖÀ¸¸ç pz/127.0.0À̶ó´Â ÆÄÀÏ ¾È¿¡ ÀúÀåÀÌ µÈ´Ù. ¿ì¸®´Â ÀÌ¹Ì ÀÌ ÆÄÀÏÀ» ¼¼ÆÃÇß´Ù. º¸¸é...

$TTL 3D
@               IN      SOA     ns.linux.bogus. hostmaster.linux.bogus. (
				1       ; Serial
				8H	; Refresh
				2H      ; Retry
				4W	; Expire
				1D)	; Minimum TTL
			NS      ns.linux.bogus.
1			PTR	localhost.

À§ÀÇ named.conf¿Í´Â ´Ù¸£°Ô ÀÌ ÆÄÀϾȿ¡ ÀÖ´Â ¸ðµç µµ¸ÞÀθíÀÇ ¸¶Áö¸·¿¡´Â '.'ÀÌ ÀÖ´Ù´Â »ç½ÇÀ» ¾Ë¾ÆµÎ±æ ¹Ù¶õ´Ù. ¾î¶² À̵éÀº ¸ðµç Á¸ ÆÄÀÏÀ» $ORIGINÀ¸·Î ½ÃÀÛÇϱ⵵ Çϴµ¥ À̰ÍÀº ºÒÇÊ¿äÇÑ °ÍÀÌ´Ù. µµ¸ÞÀÎ °èÃþ¾È¿¡ Æ÷ÇԵǾî ÀÖ´Â ÀÌ Á¸ ÆÄÀϵéÀÇ ±Ù¿øÁö´Â ÀÌ¹Ì named.conf¿¡¼­ ´Ù ¸í½Ã°¡ µÇ¾î Àֱ⠶§¹®ÀÌ´Ù. ÀÌ °æ¿ì¿¡´Â 0.0.127.in-addr.arpa ÀÌ´Ù.

ÀÌ 'zone' ÆÄÀÏÀº 3°³ÀÇ 'ÀÚ¿ø·¹ÄÚµå(RR:Resource Records)'¸¦ °¡Áö°í ÀÖ´Ù. SOA, NS, PTRÀÌ´Ù. SOA´Â Start Of AuthorityÀÇ ¾à¾îÀÌ´Ù. @´Â ¿øº»À» ÀǹÌÇÏ´Â °ÍÀ¸·Î À̰ÍÀº 'domain'Ä÷³¿¡¼­ 0.0.127.in-addr.arpa¸¦ÀǹÌÇÏ´Â °ÍÀÌ´Ù.

0.0.127.in-addr.arpa.	IN	SOA ...

NS´Â NameServerÀÇ ¾àÀÚÀÌ´Ù. ½ÃÀۺκп¡ '@'°¡ ¾ø´Ù. ÀÌ¹Ì ¾Õ ¶óÀÎÀÌ @·Î ½ÃÀ۵Ǹ鼭 @°¡ ³»Á¦µÇ¾îÀÖ´Ù. ŸÀÌÇÎ ¼ö¸¦ ÁÙ¿©¶ó. ±×·¡¼­ NS¶óÀÎÀº ÀÌ·¸°Ô ¾²¿©Áø´Ù.

0.0.127.in-addr.arpa.	IN	NS	ns.linux.bogus

À̰ÍÀº DNS¿¡°Ô ¾î¶² ÄÄÇ»ÅͰ¡ µµ¸ÞÀÎ 0.0.127.in-addr.arpaÀÇ nameserverÀÎÁö ¾Ë·ÁÁÖ°Ô µÈ´Ù. ¿©±â¼­´Â ns.linux.bogusÀÌ´Ù. 'ns'´Â º¸ÆíÀûÀ¸·Î nameserver¿¡ ºÙ´Â ¸»ÀÌ´Ù. ±×·¯³ª À¥¼­¹öÀÇ À̸§ÀÌ ÀϹÝÀûÀ¸·Î www.something À̵íÀÌ ´Ù¸¥ À̸§À» Á־ ¹«¹æÇÏ´Ù.

±×¸®°í ¸¶Áö¸·À¸·Î PTR(Domain Name Pointer)·¹ÄÚµå´Â ¼­ºê³Ý 0.0.127.in-addr.arpaÀÇ È£½ºÆ® ¾îµå·¹½º°¡ 1 ÀÓÀ» À̾߱â ÇÑ´Ù. Áï 127.0.0.1ÀÇ À̸§ÀÌ localhostÀÌ´Ù.

SOA ·¹ÄÚµå´Â ¸ðµç zone ÆÄÀÏÀÇ ¼­µÎ¿¡ ÇØ´çµÇ¸ç °¢ Á¸ ÆÄÀϸ¶´Ù ¹Ýµå½Ã Çϳª¾¿ ÀÖ¾î¾ß ÇÑ´Ù. À̰ÍÀº ±× zone ÆÄÀÏÀÌ ¹«¾ùÀ̶ó ºÒ¸®´ÂÁö(¿©±â¼­´Â ns.linux.bogus¶ó ºÒ¸°´Ù.), ´©°¡ ÀÌ contents¸¦ °ü¸®ÇÏ´ÂÁö(hostmaster@linux.bogus; emailÁÖ¼Ò¸¦ ÇÊÈ÷ ³Ö¾î¾ß ÇÑ´Ù), ÀÌ Á¸ ÆÄÀÏÀÇ ¹öÁ¯ÀÌ ¹«¾ùÀÎÁö(serial:1), ij½Ã¼­¹ö¿Í 2Â÷ DNS¼­¹ö´Â ¹«¾ùÀÎÁö µîÀ» ±âÀçÇÏ°Ô µÈ´Ù. ³ª¸ÓÁö Çʵå(refresh, retry,expire,minimum)Àº HOWTO ¿¡ ±â¼úµÈ °ÍÀ¸·Î ÇØ¶ó. À̰ÍÀÌ ¾ÈÁ¤ÀûÀÏ °ÍÀÌ´Ù. SOA ¶óÀÎÀÌ ¾²¿©Áö±â Àü¿¡ $TTL 3D¶õ °ÍÀ» À§¿¡ ±âÀçÇÏ±æ ¹Ù¶õ´Ù. À̰ÍÀº ¸ðµç zone file¿¡ ³Ö¾î¾ß ÇÑ´Ù.

ÀÌÁ¦ named ¸¦ À籸µ¿½ÃÄѺ¸ÀÚ.(ndc restart) ±×¸®°í dig¸í·É¾î·Î ÁúÀǸ¦ ÇØ º¸ÀÚ(¿É¼Ç -x)

$ dig -x 127.0.0.1

; <<>> DiG 8.2 <<>> -x 
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;;      1.0.0.127.in-addr.arpa, type = ANY, class = IN

;; ANSWER SECTION:
1.0.0.127.in-addr.arpa.  1D IN PTR  localhost.

;; AUTHORITY SECTION:
0.0.127.in-addr.arpa.   1D IN NS        ns.penguin.bv.

;; Total query time: 5 msec
;; FROM: lookfar to SERVER: default -- 127.0.0.1
;; WHEN: Sat Dec 16 01:13:48 2000
;; MSG SIZE  sent: 40  rcvd: 110

À§¿¡¼­ 127.0.0.1¿¡¼­ localhost¸¦ ã´Âµ¥ ¼º°øÇß´Ù. ÀÌÁ¦ ÁÖ¿ä ÀÛ¾÷ÀÎ linux.bogus µµ¸ÞÀÎÀ» ¸¸µé¾î º¸ÀÚ. named.confÀÇ 'zone'¼½¼Ç¿¡ Ãß°¡Ç϶ó

zone "linux.bogus" {
	notify no;
	type master;
	file "pz/linux.bogus";
};

named.conf ÆÄÀÏÀÇ µµ¸ÞÀÎ À̸§¿¡´Â '.'ÀÌ ¾ø´Ù´Â °ÍÀ» ´Ù½ÃÇѹø »ó±âÇÏÀÚ.

linux.bogusÀÇ Á¸ÆÄÀÏ¿¡´Â ÀüºÎ °¡Â¥ µ¥ÀÌÅ͸¦ ³ÖÀ» °ÍÀÌ´Ù.

;
; Zone file for linux.bogus
;
; The full zone file
;
$TTL 3D
@	IN	SOA	ns.linux.bogus. hostmaster.linux.bogus. (
			199802151	; serial, todays date + todays serial #
			8H		; refresh, seconds
			2H		; retry, seconds
			4W		; expire, seconds
			1D )		; minimum, seconds
;
		NS	ns		; Inet Address of name server
		MX	10 mail.linux.bogus	; Primary Mail Exchanger
		MX	20 mail.friend.bogus.	; Secondary Mail Exchanger
;
localhost	A	127.0.0.1
ns		A	192.168.196.2
mail		A	192.168.196.4

SOA ·¹ÄÚµå ºÎºÐ¿¡¼­ 2°¡Áö ºÎºÐÀ» ÁÖÀÇÇØ¼­ º¸ÀÚ. ns.linux.bogus´Â A ·¹Äڵ带 °¡Áø ½ÇÁ¦ ÄÄÇ»ÅÍ¿©¾ß ÇÑ´Ù. SOA·¹Äڵ尡 À̾߱âÇÏ´Â ÄÄÇ»ÅÍÀÇ À̸§À» CNAMEÀ¸·Î ÇÏ´Â °ÍÀº ±ÔÁ¤¿¡ ¾î±ß³­´Ù. ÀÌ À̸§¿¡ 'ns'°¡ µé¾î°¥ ÇÊ¿ä´Â ¾øÀ¸¸ç ¾Æ¹« À̸§ÀÌ¶óµµ ±ÔÁ¤¿¡¸¸ ¾î±ß³ªÁö ¾ÊÀ¸¸é µÈ´Ù. ´ÙÀ½À¸·Î hostmaster.linux.bogus ´Â hostmaster@linux.bogus·Î ºÁ¾ß ÇÑ´Ù. À̰ÍÀº mail alias³ª mailbox·Î¼­, DNS°ü¸®ÀÚ°¡ ÀÌ ÁÖ¼Ò·Î ¸ÞÀÏÀ» ¹Þ°Ô µÉ °ÍÀÌ´Ù. À̸§ÀÌ ²À hostmasterÀÏ ÇÊ¿ä´Â ¾ø´Ù. ÀÏ¹Ý ¸ÞÀÏÁÖ¼Ò¸¦ ³Ö¾îµµ µÇÁö¸¸ 'hostmaster' ÀÎ °ÍÀÌ È¿À²ÀûÀÏ °ÍÀÌ´Ù.

MX¶ó´Â »õ·Î¿î ·¹Äڵ尡 º¸ÀδÙ. À̰ÍÀº Mail eXchanger·Î ¸ÞÀÏ ½Ã½ºÅÛ¿¡°Ô ¾îµð·Î ¸ÞÀÏÀ» º¸³»´ÂÁö ¾Ë·ÁÁØ´Ù. mail.linux.bogus ȤÀº mail.friend.bogus·Î ÀÎÇØ ÁÖ¼Ò´Â someone@linux.bogus°¡ µÈ´Ù. °¢ computerÀ̸§¾ÕÀÇ ¼ýÀÚ´Â MX·¹ÄÚµåÀÇ ¿ì¼± ¼øÀ§¸¦ ³ªÅ¸³½´Ù. °¡Àå ³·Àº ¼ýÀÚÀÇ ·¹ÄÚµå(10)¿¡ °¡´ÉÇÑ ¿ì¼± ¼øÀ§°¡ ÁÖ¾îÁø´Ù. À̰ÍÀÌ ½ÇÆÐÇÒ °æ¿ì ´õ Å« ¼ýÀÚ¸¦ ã¾Æ¼­ °¡´Â¿¡ ¿©±â¿¡¼­´Â 20¹øÀÇ mail.friend.bogus°¡ µÈ´Ù.

´Ù½Ã ndc restartÇÑ ÈÄ dig °á°ú¸¦ »ìÆìº¸ÀÚ.

$ dig any linux.bogus +pfmin
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23499
;; QUERY: 1, ANSWER: 4, AUTHORITY: 1, ADDITIONAL: 1
;; QUERY SECTION:
;;      linux.bogus, type = ANY, class = IN

;; ANSWER SECTION:
linux.bogus.            3D IN MX        10 mail.linux.bogus.linux.bogus.
linux.bogus.            3D IN MX        20 mail.friend.bogus.
linux.bogus.            3D IN NS        ns.linux.bogus.
linux.bogus.            3D IN SOA       ns.linux.bogus. hostmaster.linux.bogus. (
                                        199802151       ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        4W              ; expiry
                                        1D )            ; minimum

Àß º¸¸é ¹ö±×°¡ ÀÖ´Ù. ¶óÀÎÀÇ

linux.bogus.            3D IN MX        10 mail.linux.bogus.linux.bogus.

°¡ À߸øµÇ¾ú´Ù.À̰ÍÀº

linux.bogus.            3D IN MX        10 mail.linux.bogus.

·Î ³ª¿Í¾ß ÇÑ´Ù. ÀϺη¯ ¹ö±×¸¦ ¸¸µé¾î¼­ º¸¿©Áá´Ù. Á¸ ÆÄÀÏ ºÎºÐ¿¡¼­ ¿ì¸®°¡ ã¾Æ³½ ºÎºÐÀ» »ìÆìº¸ÀÚ

		MX	10 mail.linux.bogus	; Primary Mail Exchanger

¸¶Ä§Ç¥°¡ ¾ø°Å³ª 'linux.bogus'°¡ Áߺ¹ÀÌ µÇ¾î ÀÖ´Ù. ³¡ºÎºÐ¿¡ ¸¶Ä§Ç¥¸¦ ÂïÁö ¾ÊÀ¸¸é Á¸ÆÄÀÏÀÇ originÀÌ ´õÇØÁ®¼­ linux.bogus.linux.bogusÇüŰ¡ µÈ´Ù. ±×·¡¼­

		MX	10 mail.linux.bogus.	; Primary Mail Exchanger

À̰ųª

		MX	10 mail			; Primary Mail Exchanger

ÀÇ ÇüÅ·ΠµÇ¾î¾ß ÇÑ´Ù. ³ª´Â ÈÄÀÚ¸¦ ¼±È£ÇÑ´Ù. ŸÀÌÇμö¸¦ ÁÙÀÌ°Ô µÇ´Ï±î. BIND Àü¹®°¡µéÀº ÀÌ·¯ÇÑ ºÎºÐÀ» µ¿ÀÇÇϱ⵵ ÇÏ°í ¹Ý´ëÇϱ⵵ ÇÑ´Ù. Á¸ ÆÄÀÏ¿¡¼­ µµ¸ÞÀÎÀº ³¡ÀÌ `.'·Î ³¡³ª´ø°¡ ¾Æ´Ï¸é ÀüºÎ Æ÷ÇÔµÇÁö ¸»¾Æ¾ß Çϸç ÀüºÎ Æ÷ÇÔµÇÁö ¾ÊÀ» °æ¿ì´Â µðÆúÆ®·Î originÀÌ µé¾î°£´Ù.

ºÐ¸íÈ÷ named.conf ÆÄÀÏ¿¡´Â `.' ÀÌ µé¾î°¡Áö ¾Ê´Â´Ù°í Çß´Ù. `.'ÀÌ µµ¸ÞÀÎ À̸§ ´ÙÀ½¿¡ ¾ó¸¶³ª ¸¹°Ô ȤÀº Àû°Ô ¾²À̰ųª ÇÏ´Â Â÷ÀÌ·Î ¼¼ÆÃÀÌ ¾ÈµÇ°í »ç¶÷µéÀ» È¥¶õ½º·´°Ô ÇÏ´Â ÀÏÀÌ ´Ù¹Ý»çÀÌ´Ù.

±×·¡¼­ »õ·Î¿î Á¸ ÆÄÀÏÀÇ »ý¼º½Ã¿¡´Â ±×¿¡ ¸Â°Ô Ãß°¡ Á¤º¸°¡ ÁÖ¾îÁ®¾ß ÇÑ´Ù.

;
; Zone file for linux.bogus
;
; The full zone file
;
$TTL 3D
@	IN	SOA	ns.linux.bogus. hostmaster.linux.bogus. (
			199802151	; serial, todays date + todays serial #
			8H		; refresh, seconds
			2H		; retry, seconds
			4W		; expire, seconds
			1D )		; minimum, seconds
;
		TXT	"Linux.Bogus, your DNS consultants"
		NS	ns		; Inet Address of name server
		NS	ns.friend.bogus.
		MX	10 mail		; Primary Mail Exchanger
		MX	20 mail.friend.bogus. ; Secondary Mail Exchanger

localhost	A	127.0.0.1

gw		A	192.168.196.1
		HINFO	"Cisco" "IOS"
		TXT	"The router"

ns		A	192.168.196.2
		MX	10 mail
		MX	20 mail.friend.bogus.
		HINFO	"Pentium" "Linux 2.0"
www		CNAME	ns

donald		A	192.168.196.3
		MX	10 mail
		MX	20 mail.friend.bogus.
		HINFO	"i486"	"Linux 2.0"
		TXT	"DEK"

mail		A	192.168.196.4
		MX	10 mail
		MX	20 mail.friend.bogus.
		HINFO	"386sx" "Linux 1.2"

ftp		A	192.168.196.5
		MX	10 mail
		MX	20 mail.friend.bogus.
		HINFO	"P6" "Linux 2.1.86"

»õ·Î¿î ·¹Äڵ尡 º¸ÀδÙ. HINFO(Host INFOmation)´Â 2°³ÀÇ ÆÄÆ®·Î ±¸¼ºµÇ¾î ÀÖ´Ù. ù° ºÎºÐÀº Çϵå¿þ¾î³ª cpuºÎºÐ, µÑ° ºÎºÐÀº ¼ÒÇÁÆ®¿þ¾î³ª OS¸¦ Ç¥½ÃÇÑ´Ù. 'ns'¶ó ºÒ¸®´Â ÄÄÇ»ÅÍ´Â ÆæÆ¼¾ö cpu¸¦ °¡Áö°í ÀÖ°í Linux 2.0À¸·Î ±¸ÇöµÈ´Ù. CNAME(Canonical Name)Àº °¢ computer¿¡°Ô ¿©·¯ À̸§À» ÁÖ´Â ¹æ¹ýÀÌ´Ù. ±×·¡¼­ www´Â nsÀÇ alias°¡ µÈ´Ù.

CNAME ·¹ÄÚµå´Â ¾à°£ÀÇ ¹®Á¦Á¡ÀÌ ÀÖ´Ù. ±×·¯³ª ±ÔÁ¤´ë·Î¸¸ ÇÏ¸é ¹®Á¦µÉ ºÎºÐÀº ¾ø´Ù. MX,CNAME,SOA ·¹Äڵ尡 CNAME ·¹Äڵ忡 ¿¬°èµÇ¾î¼­´Â ¾ÈµÈ´Ù. À̰͵éÀº A ·¹Äڵ忡¸¸ ¿¬°èµÇ¾î¾ß Çϱ⠶§¹®ÀÌ´Ù. ±×·¡¼­ ¾Æ·¡¿Í °°Àº °æ¿ì´Â ¾ÈµÈ´Ù.(www°¡ ÀÌ¹Ì CNAMEÀÌ´Ù.)

foobar		CNAME	www			; NO!

±×·¯³ª ÀÌ·± °æ¿ì´Â µÈ´Ù.

foobar		CNAME	ns			; Yes!

CNAMEÀÌ email ÁÖ¼Ò¸¦ À§ÇÑ hostnameÀ¸·Î ¾²±â¿¡´Â ÀûÇÕÇÏÁö ¾Ê´Ù°í ¿©±â´Â °ÍÀÌ Çö¸íÇÒ °ÍÀÌ´Ù. webmaster@www.linux.bogus´Â À§ÀÇ setup°ú ´Ù¸¥ À߸øµÈ °æ¿ìÀÌ´Ù. ¸¹Àº mail °ü¸®ÀÚµéÀÌ À̰ÍÀÌ ¼³·É µÇ´õ¶óµµ ÀÌ ¹æ½ÄÀ» °ÅÀÇ »ç¿ëÇÏÁö ¾ÊÀ» °ÍÀÌ´Ù. ÀÌ·¯ÇÑ ¿À·ù¸¦ ÇÇÇÏ´Â ¹æ½ÄÀº A ·¹Äڵ带 »ç¿ëÇÏ´Â °ÍÀÌ´Ù.(´Ù¸¥ MX ·¹ÄÚµå ó·³)

www		A	192.168.196.2

¸¹Àº DNSÀü¹®°¡µéÀÌ CNAMEÀ» »ç¿ëÇÏÁö ¾ÊÀ» °ÍÀ» ±Ç°íÇÑ´Ù. ±×·¯³ª »ç¿ë°¡´É ¿©ºÎ´Â ÀÌ HOWTO¿¡¼­ ³íÇÒ ºÎºÐÀº ¾Æ´Ï´Ù.

ÇÏÁö¸¸ ¸¹Àº HOWTO¿Í ¸¹Àº ½ÎÀÌÆ®µéÀÌ ÀÌ ±ÔÄ¢À» µû¸£Áö´Â ¾Ê´Â´Ù.

»õ database¸¦ ·ÎµùÇϰí ndc reload¸¦ ½ÇÇàÇØº¸ÀÚ.

$ dig linux.bogus axfr

; <<>> DiG 8.2 <<>> linux.bogus axfr 
$ORIGIN linux.bogus.
@                       3D IN SOA       ns hostmaster (
                                        199802151       ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        4W              ; expiry
                                        1D )            ; minimum

                        3D IN NS        ns
                        3D IN NS        ns.friend.bogus.
                        3D IN MX        10 mail
                        3D IN MX        20 mail.friend.bogus.
                        3D IN TXT       "Linux.Bogus, your DNS consultants"
gw                      3D IN TXT       "The router"
                        3D IN HINFO     "Cisco" "IOS"
                        3D IN A         192.168.196.1
localhost               3D IN A         127.0.0.1
mail                    3D IN HINFO     "386sx" "Linux 1.2"
                        3D IN MX        10 mail
                        3D IN MX        20 mail.friend.bogus.
                        3D IN A         192.168.196.4
www                     3D IN CNAME     ns
donald                  3D IN TXT       "DEK"
                        3D IN HINFO     "i486" "Linux 2.0"
                        3D IN MX        10 mail
                        3D IN MX        20 mail.friend.bogus.
                        3D IN A         192.168.196.3
ns                      3D IN HINFO     "Pentium" "Linux 2.0"
                        3D IN MX        10 mail
                        3D IN MX        20 mail.friend.bogus.
                        3D IN A         192.168.196.2
ftp                     3D IN HINFO     "P6" "Linux 2.1.86"
                        3D IN MX        10 mail
                        3D IN MX        20 mail.friend.bogus.
                        3D IN A         192.168.196.5
@                       3D IN SOA       ns hostmaster (
                                        199802151       ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        4W              ; expiry
                                        1D )            ; minimum

;; Received 29 answers (29 records).
;; FROM: lookfar to SERVER: 127.0.0.1
;; WHEN: Sat Dec 16 01:35:05 2000

good! °á°ú°¡ Á¸ ÆÄÀϰú ºñ½ÁÇÏ°Ô º¸ÀδÙ. wwwºÎºÐ¿¡ ´ëÇÑ Á¤º¸¸¦ È®ÀÎÇØº¸ÀÚ

$�ig www.linux.bogus +pfmin
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27345
;; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 1
;; QUERY SECTION:
;;      www.linux.bogus, type = A, class = IN

;; ANSWER SECTION:
www.linux.bogus.        3D IN CNAME     ns.linux.bogus.
ns.linux.bogus.         3D IN A         192.168.196.2

´Ù½Ã º¸¸é www.linux.bogusÀÇ ½ÇÁ¦ À̸§Àº ns.linux.bogusÀÌ´Ù. ±×¸®°í ns°¡ °¡Áø Á¤º¸µµ º¸¿©ÁÖ¸ç ÃæºÐÈ÷ ¿¬°áµÉ ¼ö ÀÖ´Ù.

ÀÌÁ¦ Àý¹Ý Çß´Ù.

5.3. The reverse zone(¿ªº¯È¯Á¸)

ÇÁ·Î±×·¥µéÀº linux.bogusÀÇ À̸§À» Á¢¼Ó°¡´ÉÇÑ ÁÖ¼Ò·Î ¹Ù²ã¾ß Á¢¼ÓÀÌ °¡´ÉÇÏ´Ù. ±×·¯³ª ¿ªº¯È¯Á¸(reverse zone)ÀÌ ÀÖ¾î¾ß DNS°¡ ÁÖ¼Ò¸¦ À̸§À¸·Î ¹Ù²Ù´Â °ÍÀÌ °¡´ÉÇÏ´Ù. ÀÌ·¯ÇÑ À̸§Àº ´ç½ÅÀÌ ÀÌ ¼­ºñ½º¸¦ »ç¿ëÇÒÁö ¸»Áö, ±×¸®°í »ç¿ëÇÑ´Ù¸é ¾ó¸¶¸¸Å­ÀÇ ¿ì¼±¼øÀ§°¡ ÁÖ¾îÁö´ÂÁöµîÀ» °áÁ¤ÇÒ ´Ù¾çÇÑ Á¾·ùÀÇ ¼­¹ö À̸§µé(FTP,IRC,WWW ±×¿Ü)¿¡¼­ »ç¿ëµÈ´Ù. ÀÎÅͳݿ¡¼­ ¸ðµç ¼­ºñ½º¿¡ ´ëÇÑ ¿ÏÀüÇÑ Á¢¼ÓÀ» À§Çؼ­´Â reverse zoneÀÌ ÇÊ¿äÇÏ´Ù.

named.conf¿¡ Ãß°¡ÇØ º¸ÀÚ

zone "196.168.192.in-addr.arpa" {
	notify no;
        type master;
        file "pz/192.168.196";
};

0.0.127.in-addr.arpa¿Í °°´Ù. ³»¿ëµµ À¯»çÇÏ´Ù.

$TTL 3D
@	IN	SOA	ns.linux.bogus. hostmaster.linux.bogus. (
			199802151 ; Serial, todays date + todays serial
			8H	; Refresh
			2H      ; Retry
			4W	; Expire
			1D)	; Minimum TTL
		NS      ns.linux.bogus.

1		PTR	gw.linux.bogus.
2		PTR	ns.linux.bogus.
3		PTR	donald.linux.bogus.
4		PTR	mail.linux.bogus.
5		PTR	ftp.linux.bogus.

ÀÌÁ¦ named¸¦ À籸µ¿½Ã۰í(ndc restart) dig·Î ´Ù½Ã °Ë»çÇØ º¸ÀÚ

$ dig -x 192.168.196.4 +pfmin
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8764
;; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUERY SECTION:
;;      4.196.168.192.in-addr.arpa, type = ANY, class = IN

;; ANSWER SECTION:
4.196.168.192.in-addr.arpa.  3D IN PTR  mail.linux.bogus.

±¦Âú¾Æ º¸ÀδÙ. ¸ðµç ºÎºÐÀ» °Ë»çÇØ º¸ÀÚ

dig -x 192.168.196 AXFR

; <<>> DiG 8.2 <<>> -x AXFR 
$ORIGIN 196.168.192.in-addr.arpa.
@                       3D IN SOA       ns.linux.bogus. hostmaster.linux.bogus. (
                                        199802151       ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        4W              ; expiry
                                        1D )            ; minimum

                        3D IN NS        ns.linux.bogus.
4                       3D IN PTR       mail.linux.bogus.
2                       3D IN PTR       ns.linux.bogus.
5                       3D IN PTR       ftp.linux.bogus.
3                       3D IN PTR       donald.linux.bogus.
1                       3D IN PTR       gw.linux.bogus.
@                       3D IN SOA       ns.linux.bogus. hostmaster.linux.bogus. (
                                        199802151       ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        4W              ; expiry
                                        1D )            ; minimum

;; Received 8 answers (8 records).
;; FROM: lookfar to SERVER: 127.0.0.1
;; WHEN: Sat Dec 16 01:44:03 2000

Àß µÈ´Ù! °á°ú°¡ À§¿Í °°Áö ¾ÊÀ¸¸é syslogÀÇ ¿¡·¯ ¸Þ½ÃÁö¸¦ ºÁ¶ó. ÀÌ¹Ì Ã¹ºÎºÐÀÇ Starting Named¿¡¼­ ¼³¸íÇØ ³ù´Ù.

5.4. ÁÖÀÇ»çÇ×

Ãß°¡ÇÒ ºÎºÐÀÌ ÀÖ´Ù. À§¿¡ ¸í½ÃµÈ IP ÁÖ¼ÒµéÀº ÀüºÎ '»ç¼³¸Á'¿¡ ±¹ÇÑµÈ ¿¹½ÃÀÌ´Ù. À̰ÍÀº ÀÏ¹Ý ÀÎÅͳݿ¡´Â Àû¿ëµÇÁö ¾Ê´Â´Ù. ±×·¡¼­ ¾ÈÀüÇÏ°Ô ¿¹½Ã¸¦ ´Ù·ê ¼ö ÀÖ´Ù. µÎ¹øÂ° ºÎºÐÀº 'notify no;'¶ó´Â ºÎºÐÀÌ´Ù. named°¡ Á¸ÆÄÀÏÀÌ ¾÷µ¥ÀÌÆ® µÉ ¶§ ½½·¹À̺꼭¹ö¿¡ °øÁö°¡ µÇ¾î¼­´Â ¾ÈµÈ´Ù´Â À̾߱âÀÌ´Ù. BIND-8 ¹öÁ¯ÀÇ named´Â zoneÆÄÀÏÀÌ ¾÷µ¥ÀÌÆ® µÉ ¶§ zone ÆÄÀÏ¿¡ ÀÖ´Â NS·¹Äڵ忡 µî·ÏµÇ ÀÖ´Â ´Ù¸¥ ¼­¹öµé¿¡°Ô °øÁö¸¦ Çϱ⠶§¹®ÀÌ´Ù. À̰ÍÀº ÀϹÝÀûÀÎ À̿뿡´Â ÆíÇÒ °ÍÀÌÁö¸¸ °³ÀÎÀûÀÎ ¿¬½À¿¡¼­´Â ÀÌ·¯ÇÑ ºÎºÐÀ» »ç¿ëÇÏÁö ¸»¾Æ¾ß ÇÒ °ÍÀÌ´Ù. ¿ì¸®°¡ ÀÌ·¯ÇÑ °ÍÀ¸·Î ÀÎÅͳÝÀ» ¾îÁö·´Èú ¼ö´Â ¾øÁö ¾Ê´Â°¡?

±×¸®°í À̰ÍÀº ¹°·Ð ¿ÏÀüÈ÷ Ç㱸ÀÌ´Ù. ½Ç·Ê¸¦ º¸·Á¸é ´ÙÀ½ ÀåÀ» ÂüÁ¶Ç϶ó

5.5. ¿Ö reverse lookups ÀÌ ÀÛµ¿ÇÏÁö ¾Ê´Â°¡?

¿ªº¯È¯ Á¸ÀÌ ¼³Á¤µÇ¾úÀ» ¶§ °¡²û name lookup(À̸§°Ë»ç)ÀÌ µÇÁö ¾Ê¾Æ¼­ '¾ÆÂ÷'ÇÏ´Â ¼ø°£µéÀÌ ÀÖ´Ù. ¼öÇàÀü¿¡ ´ç½ÅÀÇ nameserver¿¡ ´ëÇØ ¿ªº¯È¯ °Ë»ç (reverse lookups)¸¦ ÇÒ Çʿ䰡 ÀÖ´Ù. ÀÛµ¿ÇÏÁö ¾ÊÀ¸¸é ÀÌ ¼¼ÆÃÀ» ÁøÇàÇϱâ Àü¿¡ µÚ·Î °¡¼­ °íÃÄ¾ß ÇÑ´Ù.

ÀϹÝÀûÀ¸·Î ¿ªº¯È¯ °Ë»ç°¡(reverse looksup) µÇÁö ¾Ê´Â 2°¡Áö ÀÌÀ¯¸¦ µé¾î º¸°Ú´Ù.

5.5.1. ¿ªº¯È¯Á¸ÀÌ Á¦´ë·Î À§ÀÓµÇÁö ¾Ê´Â °æ¿ì.

³×Æ®¿öÅ© ÁÖ¼Ò¿Í µµ¸ÞÀÎÀ» °ø±ÞÇÏ´Â ¾÷ü¿¡ ÀϹÝÀûÀ¸·Î µµ¸ÞÀÎ À̸§À» À§Å¹ÇÏ°Ô µÈ´Ù. ±×·¯¸é ¾÷ü´Â NS ·¹Äڵ忡 Ãß°¡ÇÏ°í ¾Õ¿¡¼­ ¼³¸íÇÑ À̷дë·Î ³×ÀÓ¼­¹ö¸¦ ã´Â´Ù. ÀоîºÃ°ÚÁö¸¸ Á¦´ë·Î ÀÛµ¿µÇÁö ¾ÊÀ¸¸é ´Ù½Ã µ¹¾Æ°¡¼­ ÀоîºÁ¶ó.

¿ªº¯È¯ Á¸ ¿ª½Ã ¸Ã°ÜÁú °ÍÀε¥ ¸¸¾à 192.168.196´ëÀÇ ¸ÁÀ» ¾÷ü·ÎºÎÅÍ linux.bogus¶ó°í ¾ò¾ú´Ù¸é NS·¹Äڵ忡 Æ÷¿öµå Á¸Ã³·³ ¿ªº¯È¯Á¸À» Ãß°¡ÇÒ °ÍÀÌ´Ù. in-addr.arpa¸¦ µû¸£°í À̰ÍÀ¸·Î ¸ÁÀ» ±¸¼ºÇϸé ÀÌ ¾ÈÀÇ ¿À·ù¸¦ ã¾Æ¾ß ÇÒ °ÍÀÌ¸ç ´ëºÎºÐÀº ¾÷üÀÇ ¹®Á¦ÀÌ´Ù. ¾÷ü¿Í ¿¬¶ôÇØ¼­ ¿¡·¯¸¦ ¼öÁ¤Ç϶ó.

5.5.2. Ŭ·¡½º°¡ ¾ø´Â ¼­ºê³ÝÀ» ¾ò´Â °æ¿ì

Á»´õ ¹ßÀüµÈ Çü½ÄÀÌÁö¸¸ ¿ä»çÀÌ´Â ´ç½ÅÀÌ ¼Ò±Ô¸ð ¾÷üÀÌ¸é °¡Áö°í ÀÖÀ» ¹ýÇÑ ÀϹÝÀûÀÎ ±â¼úÀÌ µÇ¾ú´Ù.

classless ¼­ºê³ÝÀº ¿ä»õ ÀÎÅͳÝÀÇ Ãß¼¼ÀÌ´Ù. ¾ó¸¶Àü¸¸Çصµ IP ºÎÁ·À¸·Î °í»ýÀÌ ¸¹¾Ò´Ù. IETF(Internet Engineering Task Force)ÀÇ ¶È¶ÈÇÑ À̵éÀÌ ¸Ó¸®¸¦ ¸Â´ë°í ¹®Á¦¸¦ ÇØ°áÇß´Ù. ±× °á°ú·Î C Ŭ·¡½ºº¸´Ù ÀÛÀº ¼­ºê³ÝÀ» ¾ò°Ô µÇ¾ú´Âµ¥ ¿©±â¿¡ ¾à°£ÀÇ ¹®Á¦°¡ ÀÖ´Ù. Mr. DNSÀÇ »çÀÌÆ®¿¡ °¡¼­ »ç¿ë¹ý°ú ÇØ°á¹ýµµ Âü°íÇ϶ó.

ÀоÁö ¾Ê¾Ò´Ù¸é È®ÀÎÇÏ±æ ¹Ù¶õ´Ù.

ù¹øÂ° ºÎºÐÀº ÀÎÅÍ³Ý °ø±Þ¾÷ü°¡ Mr.DNSÀÇ ±â¼úÀ» ÀνÄÇÏÁö ¸øÇÑ´Ù´Â ¹®Á¦ÀÌ´Ù. ¸ðµç ÀÎÅÍ³Ý ¾÷ü°¡ ´Ù ±×·¯´Â °ÍÀº ¾Æ´ÏÁö¸¸ ¸¸¾à ÀÌ·± °æ¿ì°¡ »ý±â¸é ´ç½ÅÀÌ ¿øÀÎÀ» ¼³¸íÇÏ°í º¸ÃæÇØ Áà¾ß ÇÑ´Ù. ¹°·Ð ´ç½ÅÀÌ ÀÌ ºÎºÐÀ» ¸ÕÀú ÀÌÇØÇϰí ÀÖ¾î¾ß ÇÑ´Ù. ±×·¯¸é ±×µéÀÌ ¿ªº¯È¯ Á¸À» ¼³Á¤Çϰí dig·Î È®ÀÎÇÒ °ÍÀÌ´Ù.

µÎ¹øÂ° ºÎºÐÀº ±â¼úÀ» ¸íÈ®ÇÏ°Ô ÀÌÇØÇÏÁö ¸øÇÑ´Ù´Â °ÍÀÌ´Ù. ¾ÕºÎºÐÀÌ È®½ÇÇÏÁö ¾Ê´Ù¸é ´Ù½Ã µ¹¾Æ°¡¼­ È®ÀÎÇØº¸±æ. ±×µéÀº Dr.DNS¿¡¼­ ³ª¿Â µ¥·Î Ŭ·¡½º ¾ø´Â ¿ªº¯È¯ Á¸À» »ý¼ºÇÒ °ÍÀÌ´Ù.

¶Ç´Ù¸¥ º¹º´ÀÌ ÀÖ´Ù. ¿À·¡µÈ resolver´Â CNAME Æ®¸¯À» µû¸£Áö ¾Ê°í ¿ªº¯È¯ Á¸ÀÇ °¡µ¿À» ¸·À» °ÍÀÌ´Ù. À߸øµÈ Ŭ·¡½º¸¦ ÇÒ´çÇϰí Á¢¼ÓÀ» °ÅºÎÇϱ⵵ÇÑ´Ù. ÀÌ·¯ÇÑ °æ¿ìÀÇ ÇØ°áÃ¥Àº ÀÎÅÍ³Ý °ø±Þ¾÷ü¿¡ ¹®ÀÇÇØ¼­ classless Á¸ ÆÄÀÏ¿¡ CNAME ´ë½Å PTR·¹Äڵ带 Á÷Á¢ ³Ö´Â °ÍÀÌ´Ù.

¸î¸î ISP¾÷üµéÀº automasical systemÀ̳ª ¿ªµµ¸ÞÀÎÀ» ¸ÞÇÎÇÏ´Â ½ÄÀÇ À¥±â¹Ý ÆûÀ¸·Î À̰ÍÀ» Á¶ÀýÇϱ⵵ ÇÑ´Ù.

5.6. Slave servers(2Â÷ ³×ÀÓ¼­¹ö)

master ¼­¹ö¿¡ Á¸ÆÄÀÏ ¼³Á¤À» Á¦´ë·Î Çß´Ù¸é ÀÌÁ¦´Â Çϳª ÀÌ»óÀÇ slave¼­¹öµµ ¼³Á¤ÇØ¾ß ÇÒ °ÍÀÌ´Ù. slave ¼­¹ö´Â ²À ÇÊ¿äÇÑ °ÍÀÌ´Ù. 1Â÷ µµ¸ÞÀÎÀÌ Á×¾î ¹ö·Áµµ »ç¶÷µéÀº 2Â÷ ³×ÀÓ¼­¹ö·Î ã¾Æ°¡ Á¤º¸¸¦ ¾ò°Ô µÉ °ÍÀÌ´Ù. slave ¼­¹ö´Â 1Â÷ ¼­¹ö¿Í ¸Ö¸® ¶³¾îÁ® Àִ°ÍÀÌ ÁÁ´Ù. 1Â÷ DNS¼­¹ö¿Í 2Â÷ DNS¼­¹ö´Â µÉ ¼ö ÀÖÀ¸¸é Power Supply,LAN,ISP,µµ½Ã, ±¹°¡µî.. °øÀ¯ÇÏ´Â °ÍÀÌ ÀûÀ» ¼ö·Ï ÁÁ´Ù. master¿Í slave °¡ À§ÀÇ »çÇ×µéÀÌ ¸ðµÎ ´Ù¸¥ °æ¿ì¶ó¸é ´ç½ÅÀÇ slave´Â ¸Å¿ì ÀßµÈ ¿¹ÀÌ´Ù.

slave´Â ´Ü¼øÈ÷ master·ÎºÎÅÍ Á¸ÆÄÀϵéÀ» º¹»çÇØ¿Â´Ù. ¾Æ·¡¿Í °°ÀÌ ¼³Á¤ÇÏ¸é µÈ´Ù.

zone "linux.bogus" {
	type slave;
	file "sz/linux.bogus";
	masters { 192.168.196.2; };
};

´Ü¼øÈ÷ µ¥ÀÌÅͰ¡ º¹»çµÇ´Â ±¸Á¶ÀÌ´Ù. ÀÌ·¯ÇÑ ÆÄÀϺ¹»ç´Â SOA¿¡ ÀÇÇØ Á¶Á¤µÈ´Ù.

@	IN	SOA	ns.linux.bogus. hostmaster.linux.bogus. (
			199802151	; serial, todays date + todays serial #
			8H		; refresh, seconds
			2H		; retry, seconds
			4W		; expire, seconds
			1D )		; minimum, seconds

masterÀÇ ½Ã¸®¾ó³Ñ¹ö°¡ ´ÜÁö slaveº¸´Ù Å©±â¸¸ Çϸé Á¸ÆÄÀÏÀÌ Àü¼ÛµÈ´Ù. slaveÀÇ refresh´Â master°¡ ¾÷µ¥ÀÌÆ® µÉ ¶§¸¶´Ù üũÇÒ °ÍÀÌ´Ù. ¸¸¾à¿¡ üũ°¡ µÇÁö ¾ÊÀ¸¸é(master°¡ Á׾) ¸Å¹ø Àç½Ãµµ Çϸ鼭 üũÇÒ °ÍÀÌ´Ù. expire±â°£±îÁö ½ÇÆÐ¸¦ ÇÑ´Ù¸é slave´Â Á¸ÆÄÀÏÀ» Á¦°ÅÇÏ°í ´õÀÌ»ó ³×ÀÓ¼­¹öÀÇ ±â´ÉÀ» ÇÏÁö ¾ÊÀ» °ÍÀÌ´Ù.