¾Õ¿¡¼ ó·³, ¸¹Àº NS(Name Server)µé°£ÀÇ Çù·Â¿¡ ÀÇÇؼ À̸§µéÀÌ °ü¸®µÈ´Ù. µû¶ó¼, »õ·Î¿î
µµ¸ÞÀÎ ¸íÀ» ºÎ¿©¹ÞÀ¸·Á¸é, ÀÌ·¯ÇÑ Ã¼°è¿¡ µî·ÏÀ» Çؾ߸¸ ÇÑ´Ù.
±¹³»¿¡ ÀÌ·¯ÇÑ DNS µî·ÏÀ» ó¸®ÇØÁÖ´Â ¾÷ü·Î,
°¡ºñ¾Æ,
ÈÄÀÌÁî,
RGNames,
µµ·¹Áö °°Àº ¾÷üµéÀÌ ÀÖÀ¸¸ç, °Ë»ö»çÀÌÆ®¿¡¼
"µµ¸ÞÀεî·Ï"À¸·Î ãÀ¸¸é µÈ´Ù. ºñ¿ëÀº 2,3¸¸¿ø Á¤µµÀε¥, ¾÷ü¿¡ µû¶ó¼ µî·Ï°¡´ÉÇÑ µµ¸ÞÀÎ ¿¹¸¦ µé¸é,
*.com, *.net¸¸ µÇ°Å³ª, *.co.kr¸¸ µÇ´Â °æ¿ìµµ ÀÖ´Ù.
¾ÕÀÇ ±×¸²Ã³·³ ´Ù¼öÀÇ NS°¡ Âü¿©Çϱ⠶§¹®¿¡ ¸¸¾à ¾û¶×ÇÑ µµ¸ÞÀÎ ¸íÀ¸·Î »çÀÌƲ °Ë»öÇÏ°Ô µÇ¸é,
¿©·¯ NSµé¿¡°Ô ¹°¾îº¸´Â ½Ã°£ÀÌ °É¸®±â ¶§¹®¿¡ Àû°Ô´Â 30ÃÊ¿¡¼ ¸¹°Ô´Â 4ºÐ±îÁö ¼Ò¿äµÈ ÀÌÈÄ¿¡¾ß
¿¡·¯ ¸Þ½ÃÁö¸¦ ¸¸³ª°Ô µÈ´Ù. ºê¶ó¿ìÀú·Î µµ¸ÞÀθíÀ» À߸øÄ£ °æ¿ì ÇÑÂüÈÄ¿¡ ¿¡·¯ ¸Þ½ÃÁö°¡ ³ªÅ¸³ª´Â ÀÌÀ¯°¡
¹Ù·Î ÀÌ·¯ÇÑ ¿øÀÎ ¶§¹®ÀÌ´Ù.
DNS ¸Þ½ÃÁö´Â TCPÀ§¿¡ ´ÙÀ½°ú °°Àº ÇüÅ·Π±¸¼ºµÇ¾îÁø´Ù. ÀÌ Áß ÀϺδ °æ¿ì¿¡ µû¶ó¼ ºñ¾îÀÖÀ» ¼ö ÀÖ´Ù.
+---------------------+
| Header |
+---------------------+
| Question | the question for the name server
+---------------------+
| Answer | RRs answering the question
+---------------------+
| Authority | RRs pointing toward an authority
+---------------------+
| Additional | RRs holding additional information
+---------------------+
´ÙÀ½Àº Çì´õºÎºÐ¿¡ ´ëÇÑ Çü½ÄÀÌ´Ù.
1 1 1 1 1 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ID |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|QR| Opcode |AA|TC|RD|RA| Z | RCODE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QDCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ANCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| NSCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ARCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Field | Bits | Description |
ID | 16 | DNSÁúÀÇ/ÀÀ´äÀ» ¸ÂÃß±â À§ÇÑ Sequence/KeyÁ¤µµ·Î º¸¸é µÈ´Ù.
Áï, 2 Byte ¹üÀ§ÀÇ ¼ýÀÚ·Î Áõ°¡½ÃÄÑ °¡¸é¼ »ç¿ëÇÏ¸é µÈ´Ù. |
QR | 1 | ÁúÀÇÀÎÁö ÀÀ´äÀÎÁö ¿ë Ç÷¡±× ( 0:ÁúÀÇ, 1:ÀÀ´ä ) |
Opcode | 4 | QueryÀÇ Á¾·ù·Î ´ë°³ 0À» »ç¿ëÇÑ´Ù.
- 0 : a standard query (QUERY) - 1 : an inverse query (IQUERY)
- 2 : a server status request (STATUS) - 3 ~ 15 : reserved for future use |
AA | 1 | Authoritative Answer (ÀÀ´ä ½Ã¸¸ ¼³Á¤µÇ¾î¿È)
°ø½Ä³×ÀÓ¼¹öÀÇ ÀÀ´ä¿©ºÎ Ç÷¡±×( 0:ºñ°ø½Ä, 1:°ø½Ä) |
TC | 1 | TrunCation(ÀÀ´ä ½Ã¸¸ ¼³Á¤µÇ¾î¿È)
ÀÀ´äÀÇ °æ¿ì Á¤ÇØÁø »çÀÌÁî(UDPÀÇ Á¦ÇÑÀº 512ÀÓ)¸¦ ÃÊ°úÇؼ Àß·È´ÂÁö ¿©ºÎ¸¦ ³ªÅ¸³»´Â Ç÷¡±× ( 0:Á¤»ó , 1:À߸² ) |
RD | 1 | Recursion DesiredÁúÀǽÿ¡ Àç±ÍÀûÀÎ ÁúÀÇ ÇÊ¿ä ¿©ºÎ
±âº»Àº ÇÊ¿ä ( 0:ºÒÇÊ¿ä,1:ÇÊ¿ä ) |
RA | 1 | Recursion Available(ÀÀ´ä½Ã¿¡¸¸ ¼³Á¤µÇ¾î¿È)
ÀÀ´äÇÑ ³×ÀÓ¼¹ö°¡ Àç±ÍÁúÀÇ(RD)¸¦ ÇÒ ¼ö ÀÖ´ÂÁö ¿©ºÎ( 0:¸øÇÔ,1:ÇÔ ) |
Z | 3 |
³ªÁßÀ» À§ÇØ ¿¹¾àµÈ ºÎºÐ. Ç×»ó 0À¸·Î ¼³Á¤ÇØ¾ß ÇÔ. |
RCODE | 4 | Response code(ÀÀ´äÄÚµå)
Value | ³»¿ë | ¼³¸í |
0 | Success | ¼º°ø |
1 | Format Error | Query°¡ À߸øµÈ °æ¿ì |
2 | Server Failure | ³×ÀÓ¼¹ö ÀÚüÀÇ ¹®Á¦·Î ½ÇÆÐ |
3 | Name Error | ÇØ´ç ³×ÀÓÀÌ Á¸ÀçÇÏÁö ¾ÊÀ½ |
4 | Not Implemented | ³×ÀÓ¼¹ö°¡ Query¸¦ Áö¿ø¸øÇÔ |
5 | Refused | Á¤Ã¥ÀûÀÎ ÀÌÀ¯·Î Query¸¦ °ÅÀýÇÔ |
6~15 | Reserved | ³ªÁßÀ» À§Çؼ ¿¹¾àµÊ |
|
QDCount | 16 | Question SectionÀÇ °³¼ö( unsigned 16 bit integer) |
ANCount | 16 | Answer Section¿¡ ÀÖ´Â resource recordÀÇ °³¼ö(ÀÀ´ä ½Ã¸¸ ¼³Á¤µÊ)( unsigned 16 bit integer) |
NSCount | 16 | Authorities Section¿¡ ÀÖ´Â server resource recordÀÇ °³¼ö(ÀÀ´ä ½Ã¸¸ ¼³Á¤µÊ) ( unsigned 16 bit integer) |
ARCount | 16 | Additional Information Section¿¡ ÀÖ´Â resource recordÀÇ °³¼ö(ÀÀ´ä ½Ã¸¸ ¼³Á¤µÊ) ( unsigned 16 bit integer) |
* ÁúÀǸ¦ Àü¼ÛÇÒ ¶§ QDCOUNT°¡ 1°³ ÀÖ°í, ³ª¸ÓÁö COUNTµéÀº ´ë°³ 0À¸·Î ¼³Á¤µÇ¾î Àü¼ÛµÈ´Ù.
- Last Update : 2003.04.25 by Deadfire(http://www.deadfire.net)
|
|
|