DNSµÄÀ´ÓÉ
Èç¹ûÄúΪÄúµÄ»úÆ÷É趨¹ýinternetÁ¬ÏßÄÇ÷áÄúÒ»¶¨½Ó´¥¹ýDNSÁ˵«DNSÓÖÊÇʲ÷á¶«¶«ÄØËµ´©ÁËDNSÊÇÓÃÀ´°ïÖú¼ÇÒäÍøÂ·µØÖ·µÄÍêÈ«ÊÇΪÁËǨ¾ÍÈËÀàµÄ¼ÇÒä˼ά¶øÉèµÄ¡£
DNSµÄÈ«³ÆÊÇDomain Name Systemµ±ÄúÁ¬ÉÏÒ»¸öÍøÖ·ÔÚURL´òÉÏ
www.hotmail.comµÄʱºò¿ÉÒÔ˵¾ÍÊÇÊ ... ¹ÓõÄÖ»ÊÇIPµØÖ·¶øÒÑ(×îÖÕÒ²ÊÇ0ºÍ1À²)Õâ¸ö
www.hotmail.comÖ»ÊÇÈÃÈËÃÇÈÝÒ×¼ÇÒ ... ȽÏÓÐÒâÒåµÄÎÄ×Ö¼ÇÒä(Èç
www.hotmail.com)±È¼ÇÒäÄÇЩºÁÎÞÍ·Ð÷µÄºÅÂë(Èç209.185.243.135)ÍùÍùÈÝÒ׵öࡣDNSµÄ×÷ÓþÍÊÇΪÎÒÃÇÔÚÎÄ×ÖºÍIPÖ®¼äµ£µ±ÁË·Òë¶øÃâ³ýÁËÇ¿¼ÇºÅÂëµÄÍ´¿à¡£
¼ÙÈçÄúµÄµç»°ÓÐÃû×Ö¼ÇÒä
¹¦ÄÜÄúÖ»ÐèÖªµÀ¶Ô·½µÄÃû×־ͿÉÒÔ²¦ºÅ¸øÓÑÈËÁËÎÒÃÇ¿ÉÒÔ˵Õâµç»°Ò²¾ß±¸ÈçDNSµÄ
¹¦ÄÜÁËÄØµ«ÊÇÎÒÃÇÔÚÍøÂ·ÖÐʹÓõÄDNS
ϵͳ¾ÍÊÇÕâ÷á¼òµ¥Âð·ÇÒ²ÔӵúÜÄØÏÂÃæ¾ÍÈÃÎÒÃÇÒ»Æðȥ̽Ë÷Ò»ÏÂDNSµÄ°ÂÃØ
ÔÚÔçÆÚµÄIPÍøÂ·ÊÀ½çÀïÃæÃ¿Ì¨
µçÄÔ¶¼Ö»ÓÃIPµØÖ·À´±íʾ²»¾ÃÈËÃǾͷ¢ÏÖÕâÑùºÜÄѼÇÒäì¶ÊÇһЩUNIXµÄʹÓÃÕ߾ͽ¨Á¢Ò»¸öHOSTS¶ÔÓ¦±í½«IPºÍ
Ö÷»úÃû×Ö¶ÔÓ¦ÆðÀ´ÕâÑù
Óû§Ö»ÐèÊäÈë
µçÄÔÃû×־ͿÉÒÔ´úÌæIPÀ´½øÐйµÍ¨ÁË¡£Èç¹ûÄã°²×°ÁË
LinuxϵͳÔÚ/etcÏÂÃæ¾Í¿ÉÒÔÕÒµ½Õâ¸öhostsµµ°¸ÁËÔÚNTµÄϵͳÀïÄãÒ²¿ÉÒÔÔÚ\winnt\system32\drivers\etcÏÂÃæÕÒµ½Ëü¡£²»¹ýÕâ¸öHOSTSµµÊÇÒªÓÉ
¹ÜÀíÕßÊÖ¹¤Î¬»¤µÄ×î´óµÄÎÊÌâÊÇÎÞ·¨ÊÊÓÃì¶´óÐÍÍøÂ·¶øÇÒ¸üÐÂÒ²ÊǼþ·Ç³£Í·Í´µÄÊÂÇé¡£Õâ¾ÍÊÇDNS´óÅÉÓó¡µÄʱºòÁË¡£
DNSµÄ½á¹¹
DNSÊÇÒ»¸ö·Ö²ã¼¶µÄ·ÖɢʽÃû³Æ¶ÔӦϵͳÓеãÏñµçÄÔµÄĿ¼Ê÷½á¹¹ÔÚ×î¶¥¶ËµÄÊÇÒ»¸ö¡°root¡±È»ááÆäÏ·ÖΪºÃ¼¸¸ö»ù±¾Àà±ðÃû³ÆÈçcomorgeduµÈÔÙÏÂÃæÊÇ×éÖ¯Ãû³ÆÈçsonytoshibaintelµÈ¼Ì¶øÊÇÖ÷»úÃû³ÆÈçwwwmailftpµÈ¡£ÒòΪµ±³õinternetÊÇ´Ó
ÃÀ¹ú·¢ÆðµÄËùÒÔµ±Ê±²¢Ã»ÓйúÓòÃû³Æµ«Ëæ×ÅááÀ´internetµÄÅ·¢Õ¹DNSÒ²¼Ó½øÁËÖîÈçtwhkauµÈ¹úÓòÃû³Æ¡£ËùÒÔÒ»¸öÍêÕûµÄdnsÃû³Æ¾ÍºÃÏñÊÇÕâÑùµÄ
www.xyz.com.tw¶øÕû¸öÃû³Æ¶ÔÓ¦µÄ¾ÍÊÇÒ»¸öIPµØÖ·ÁË¡£
ÔÚ¿ªÊ¼µÄʱºòrootÏÂÃæÖ»ÓÐÁù¸ö×éÖ¯Àà±ð
Àà±ðÃû³Æ ´ú±íÒâ˼
edu ½ÌÓýѧÊõµ¥Î»
org ×éÖ¯»ú¹¹
net ÍøÂ·Í¨Ñ¶µ¥Î»
com ¹«Ë¾ÆóÒµ
gov Õþ¸®»ú¹Ø
mil ¾üʵ¥Î»
²»¹ý×Ô´Ó×éÖ¯Àà±ðÃû³Æ¿ª·ÅÒÔáá¸÷ÖÖ¸÷ÑùÎ廨°ËÃŵÄÃû³ÆÒ²Ïà¼ÌÏÖ³öÀ´Á˵«ÎÞÂÛÈçºÎÈ¡ÃûµÄ¹æÔò×îºÃÁ¿ÊʺÏÍøÕ¾ÐÔÖÊ¡£³ýÁËÔÀ´µÄÀà±ð
×ÊÁÏÓÉÃÀ¹ú±¾ÍÁµÄNIC(Network Information Center)¹ÜÀíÖ®ÍâÆäËüÔÚ¹úÓòÒÔϵÄÀà±ð·Ö±ðÓɸùúµÄNIC¹ÜÀí¡£ÕâÑùµÄ½á¹¹¿´ÆðÀ´¾ÍÏñÕâÑù
ÔڽṹÖи÷×éÖ¯µÄDNS¾¹ýÉêÇëááÓɸÃ×éÖ¯»òÆäί»ú¹¹¹ÜÀí(ͨ³£µ±ÄúÉêÇë²áÒ»¸ödomainÓòÃû³ÆµÄʱºò¶¼ÒªÖ¸¶¨Á½Ì¨DNSÖ÷»ú¸ºÔð¸ÃÓòÃûµÄDNS¹ÜÀí)¡£
DNSµÄÔË×÷
ÔÚÎÒÃÇÉ趨IPÍøÂ·»·¾³µÄʱºòͨ³£¶¼Òª¸æËßÿ̨Ö÷»ú¹Øì¶DNSËÅ·þÆ÷µÄµØÖ·(ÎÒÃÇ¿ÉÒÔÊÖ¶¯µÄÔÚÿһ̨Ö÷»úÉÏÃæ
ÉèÖÃÒ²¿ÉÒÔʹÓÃDHCPÀ´É趨)¡£
ÏÂÃæÈÃÎÒÃÇ¿´¿´DNSÊÇÔõÑùÔË×÷µÄ
µ±±»Ñ¯Îʵ½Óйر¾ÓòÃûÖ®ÄÚµÄÖ÷»úÃû³ÆµÄʱºòDNSËÅ·þÆ÷»áÖ±½Ó×ö³ö»Ø´ð
Èç¹ûËù²éѯµÄÖ÷»úÃû³ÆÊôì¶ÆäËüÓòÃûµÄ»°»á¼ì²é¼ÇÒäÌå¿´¿´ÓÐûÓÐÏà¹Ø×ÊÁÏ
Èç¹ûûÓз¢ÏÖÔò»áתÏòrootËÅ·þÆ÷²éѯ
È»áárootËÅ·þÆ÷»á½«¸ÃÓòÃûÖ®ÊÚȨ(authoritative)ËÅ·þÆ÷(¿ÉÄܻᳬ¹ýһ̨)µÄµØÖ·¸æÖª
±¾µØËÅ·þÆ÷È»áá»áÏòÆäÖеÄһ̨ËÅ·þÆ÷²éѯ²¢½«ÕâЩËÅ·þÆ÷Ãûµ¥´æµ½¼ÇÒäÌåÖÐÒÔ±¸½«À´Ö®Ðè(ʡȴÔÙÏòroot²éѯµÄ²½Öè)
Ô¶·½ËÅ·þÆ÷»ØÓ¦²éѯ
½«²éѯ½á¹û»ØÓ¦¸ø¿Í»§²¢Í¬Ê±½«½á¹û´¢´æÒ»¸ö±¸·ÝÔÚ×Ô¼ºµÄ¿ìÈ¡¼ÇÒäÀïÃæ
Èç¹ûÔÚ´æ·Åʱ¼äÉÐδ¹ýʱ֮ǰÔÙ½Óµ½ÏàͬµÄ²éѯÔòÒÔ´æ·Åì¶¿ìÈ¡¼ÇÒäÀïÃæµÄ×ÊÁÏÀ´×ö»ØÓ¦¡£
´ÓÕâ¸ö¹ý³ÌÎÒÃÇ¿ÉÒÔ¿´³öûÓÐÈκÎһ̨DNSÖ÷»ú»á°üº¬ËùÓÐÓòÃûµÄDNS×ÊÁÏ×ÊÁ϶¼ÊÇ·ÖÉ¢ÔÚÈ«²¿µÄDNSËÅ·þÆ÷ÖжøNICÖ»ÐèÖªµÀ¸÷DNSËÅ·þÆ÷µØÖ·¾Í¿ÉÒÔÁË¡£
ΪÁ˸üºÃµØÀí½âһϠDNS µÄÔË×÷ÈÃÎÒÃÇÓÃÏÂͼ¿´¿´²éѯ
www.home.netman.com.twÕą̂Ö÷»úλַµÄ¹ý³Ì
ÔÚÕâ¸öÀý×ÓÖÐ
www.home.netman.com.tw̨Ö÷»úµÄDN ... µÄDNSËÅ·þÆ÷¹ÜÀíµÄ¡£(ÔÚDNSÊõÓïÖÐÎÒÃdzÆÒ»¸öÓòÃûΪ¡°zone¡±Õâ¸özone¿ÉÒÔÊÇÄú´ÓNICÉêÇë»ØÀ´µÄÓòÃûÒ²¿ÉÒÔÊÇ´Ó¸ÃÓòÃûÖ®ÏÂÑÓÉì³öÀ´µÄ¡°sub-zone¡±)¡£ÔÚÕą̂DNSËÅ·þÆ÷ÉÏÃæ±ØÐëÓÐÒ»¸ö¹Øì¶home.netman.com.twÕâ¸özoneµÄµµ°¸¶øÕâµµ°¸ÀïÃæ±ØÐëÓÐÒ»±Ê¹Øì¶wwwµÄ¼Ç¼(ÈκÎÖ÷»ú¶¼ÊÇÒÔ¡°¼Ç¼¡±À´±íʾ)¡£Õâ¸ö¼Ç¼¿ÉÒÔΪһ¸öIPµØÖ·Ò²¿ÉÒÔÒÔ±ðÃûÐÎʽÀ´¶ÔӦһ̨Ö÷»úÃû³Æµ«ÎÞÂÛÈçºÎËù¶ÔÓ¦µÄÖ÷»úÃû³Æ×îÖÕÊÇÒª±»Ò»¸öIPµØÖ·Ëù¶ÔӦמÍÊÇÁË¡£
ͬʱDNS»¹ÄÜÌṩ¡°·´²éѯ¡±(reverse lookup)¹¦ÄÜÒ²¾ÍÊÇÒÔIPÀ´²éѯÖ÷»úÃû³Æ¡£ÍøÂ·ÉÏÃæµÄÐí¶à
·þÎñÈçFTP, IRC, WWWµÈµÈ¶¼ÐèÒªµ½Õâ¸ö¹¦ÄÜ¡£ÆäʵDNS
·þÎñ±¾Éí¾Í±ØÐëҪʹÓ÷´²éѯ¹¦ÄܶøÇÒÔÚÉ趨ÉÏÒ²±ØÐëҪΪÿ¸öÍøÂ·½¨Á¢Æðreverse zone¡£ËäÈ»ÓÐЩÈË·¢¾õ¼´Ê¹Ã»ÓÐreverse zoneÒ²¿ÉÒÔÀûÓõ½DNS
·þÎñµ«ÆäÖб׶ËÈ´²»ÈÝÒ×±»²ì¾õµ½ÔÚÕâ¸ö(ÖÐÎÄ)
ÍøÒ³http://ns.nctu.edu.tw/Basic/When ... ú¿ÉÒÔ¿´µ½ºöÂÔrevers zoneËùÖÂһЩÎÊÌâ¡£
DNSµÄÃû³Æ¼Ç¼
ÊÂʵÉÏDNS²»½ö½öÊÇÓÃÀ´½âÊ͵ØÖ·ÓõĶøÇÒ»¹¿ÉÒԻشð¸ü¶à¹Øì¶ÍøÂ·ºÍÖ÷»úµÄÆäËüÐÅÏ¢ÆäÖкÜÖØÒªµÄÒ»¸ö¹¦ÄܾÍÊÇ¿ÉÒÔ¹©Óʼþϵͳ½øÐÐ
·ÓÉ¡£ÕâЩ×ÊÁÏͨ³£»áÒÔ²»Í¬µÄ¡°¼Ç¼¡±Ãû³Æ³öÏÖÔÚDNSµÄ×ÊÁϵµ°¸ÖС£
ÏÂÃæÈÃÎÒÃDzο¼Ò»¸öLinuxµÄDNSµµ°¸¿´¿´ÕâЩ¼Ç¼ÊÇÈçºÎ±íʾµÄ
;
; Zone file for siyongc.domain
;
; Then full zone file
;
$TTL 86400
@ IN SOA redhat52.siyongc.domain. netman.siyongc.domain. (
1999092801 ; serial
8H ; refresh
2H ; retry
1W ; expire
1D ) ; minimun
;
IN TXT "A test domain, created by Netman"
IN NS redhat52
IN NS debian.home.
IN MX 10 redhat52.siyongc.domain.
IN MX 20 debian.home.
;
localhost IN A 127.0.0.1
gw IN A 192.168.0.17
IN HINFO "Redhat" "MASQ"
IN TXT "The masquerade gateway to internet"
redhat52 IN A 192.168.0.17
IN MX 10 redhat52
IN MX 20 debian.home.
IN HINFO "Dell PII 266" "Linux RedHat"
www IN CNAME redhat52
mail IN CNAME redhat52
ftp IN CNAME redhat52
news IN CNAME redhat52
smtp IN CNAME redhat52
pii266 IN A 192.168.0.15
IN MX 10 redhat52.siyongc.domain.
IN MX 20 debian.home.
slware36 IN A 192.168.0.18
IN MX 10 redhat52.siyongc.domain.
IN MX 20 debian.home.
rhroute IN A 192.168.0.4
IN MX 10 redhat52.siyongc.domain.
IN MX 20 debian.home.
ÎÒÃǹÃÇÒ²»Àí»á¿ªÍ·ÄǼ¸ÐеÄÒâ˼ÄÇÊǸøDNSϵͳ±¾ÉíʹÓõÄ(ÎÒ½«»áÔÚ¡°Ñ§Ï°Linux¡±ÎÄÕÂÀïÃæÔÙÏêϸÌÖÂÛ)ÕâÀïÎÒÃÇÖ»ÊÇ¿´¿´¼¸¸ö¼Ç¼Ãû³Æ¶øÒÑ
Àà±ðÃû³Æ ´ú±íÒâ˼
TXT Ö»ÊÇһЩ˵Ã÷ÎÄ×Ö¿ÉÒÔÓÃÀ´ËµÃ÷Ö÷»ú/ÍøÂ·»·¾³É趨
NS Ãû³ÆËÅ·þÆ÷Ò²¾ÍÊǸÃzoneÖ¸¶¨µÄDNSËÅ·þÆ÷Ãû³Æ
MX ÓʼþËÅ·þÆ÷¸ºÔð¾ÓÉDNS²éѯ½øÐÐÓʼþ´«µÝµÄÓʼþËÅ·þÆ÷¡£ÕâÑùµÄºÃ´¦ÊÇÈç¹ûÄúÒª¸ü»»ÓʼþËÅ·þÆ÷µÄ»°Ö»ÐèÐÞ¸ÄDNS¼Ç¼¾Í¿ÉÒÔÁ˶ø¶Ô·½µÄÓʼþËÅ·þÆ÷ÔòÎÞÐèÀí»áÄúҪʹÓõľ¿¾¹ÊÇÄÄһ̨µçÄÔÀ´¸ºÔðÓʼþ½»»»¡£Í¬Ê±ÄúÒ²¿ÉÒÔÖ¸¶¨¶ą̀ÓʼþËÅ·þÆ÷À´·Öµ£Óʼþ½»»»¹¤×÷ÔÚMXááÃæµÄºÅÊýÓÃÀ´Ö¸¶¨ËÅ·þÆ÷µÄʹÓÃ˳ÐòÊý×ÖÔ½µÍÔ½ÓÅÏÈ¡£
A ÓÃÀ´¶ÔÓ¦Ö÷»úÃû³ÆºÍÆäIPµØÖ·Õâ¸ö¼Ç¼×î³£ÓöøÇÒÒ²ÊÇ×îÖØÒªµÄ¼Ç¼֮һ
HINFO ºÍTXT²î²»¶àÊǻشð¡°Host Information¡±²éѯÓõÄ
CNAME ÊÇÒ»¸ö¡°±ðÃû¡±¼Ç¼¿ÉÒÔ¸øA¼Ç¼ʹÓÃÁíÍâÒ»¸ö(»ò¶à¸ö)Ãû³ÆÈÃÍâÃæ²éѯ¡£CNAME¿ÉÒÔ¶ÔÓ¦Ò»¸öA¼Ç¼µ«²»¹ÄÀø¶ÔÓ¦ÁíÒ»¸öCNAME¼Ç¼¡£
AAAA ºÍA¼Ç¼һÑùÖ»²»¹ý¶ÔÓ¦µÄÊÇIP v6 ¸ñʽ
·Öµ£DNS¹¤×÷
Primary(master) DNSËÅ·þÆ÷ÊǼÜÉèÔÚijһ¸öÍøÓòϱ»Ö÷ÒªÊÚȨ²¢¿ØÖÆËùÓÐÃû³Æ¼Ç¼µÄÖ÷¿ØÖÆËÅ·þÆ÷¹ÜϽ×ÅËùÓиÃÍøÓòµÄ¼Ç¼×ÊÁÏÕâЩ¼Ç¼×ÊÁÏÖ»ÓÐprimary(master)¿ÉÒÔÐ޸ġ£
µ«Èç¹ûÔÚÒ»¸ö±È½Ï´óÐ͵ÄÍøÂ·ÖÐDNSËÅ·þÆ÷¾Í»á±äµÃºÜ·±Ã¦ÁËËùÒÔÄú¿ÉÒÔÉ趨¶à¸öDNSÀ´·Öµ£masterµÄ¹¤×÷µ«Äú»òÐí²»Ô¸Ò⵽ÿһ¸öDNSËÅ·þÆ÷È¥¸üÐÂ×ÊÁϰɶøÇÒ¾ÍËãÄúÔ¸ÒâÕâÑù×öÒ²ÈÝÒ׳öÏÖ´íÎó»ò×ÊÁϲ»Í¬²½µÄÇéÐΡ£ÕâÑùÄú¿ÉÒÔÉ趨ÆäËüµÄËÅ·þÆ÷Ϊsecondary (slave) DNSÀ´masterÉÏÃæµÄ¼Ç¼×ÊÁÏÕâÑùÆäËüµÄµçÄÔ¿ÉÒÔ±»Ö¸¶¨µ½²»Í¬µÄDNS×ö²éѯ¼È¿ÉÒÔ·Öµ£masterµÄ¹¤×÷¶øÇÒ×ÊÁÏÒ²¿ÉÒÔ
×Ô¶¯½øÐÐͬ²½¹¤×÷¡£Äú¿ÉÒÔÉ趨DNS×ÊÁÏͬ²½µÄʱ¼ä¼ä¸ôÔÚdnsµµ°¸ÖеÄRefreshÉ趨¾ÍÊÇÁË¡£Í¬Ê±Äú»¹»á¿´µ½Serialµ±slaveµÄÉÏÃæµÄserialÊý×ÖÉÙì¶Ëü×ÊÁϾͻᱻ·ñÔò»á±»ºöÂÔ¡£
ÑéDNS¹¤×÷
µ±Äú½¨Á¢ºÃÒ»¸öDNSËÅ·þÆ÷Ö®áá³ýÁË¿ÉÒÔÖ±½ÓʹÓÃ
ÃüÁî ping (Õâ¸ö»áÔÚááÃæÕ½Ú˵Ã÷)Ö±½Ó
pingÒ»ÏÂÉÏÃæµÄ¼Ç¼֮Íâ×îºÃ»¹ÊÇʹÓá°nslookup¡±Õâ¸ö
ÃüÁî½øÐÐ
¼ì²â»ò³ý´í(
Windows9xϵͳ²¢²»°üº¬´Ë
ÃüÁî)¡£ÏÂÃæÈÃÎÒÃÇÔÚLinuxÖÐÑéһϵ±ÄúÊäÈënslookupÖ®ááÄú»á¿´µ½Äú»úÆ÷Ŀǰָ¶¨µÄDNSËÅ·þÆ÷µÄ»ØÓ¦
Default Server: redhat52.siyongc.domain
Address: 192.168.0.17
È»ááÄúÊäÈëÓû²éѯµÄÖ÷»ú»òIPµØÖ·Äú»á¿´µ½´ÓDNS»ØÀ´µÄ½á¹û
> pii266.siyongc.domain
Server: redhat52.siyongc
Address: 192.168.0.17
Name: pii266.siyongc.domain
Address: 192.168.0.15
>
www.hinet.net
Server: redhat52.siyongc.domain
Address: 192.168.0.17
Non-authoritative answer:
Name: w3c2.hinet.net
Address: 168.95.1.84
Aliases:
www.hinet.net
ÕâÊÇÒ»¸ö±ê׼ģʽÏÂÃæµÄ²éѯÎÒÃÇ¿ÉÒÔ¿´µ½²»ÊÇÕą̂DNSËÅ·þÆ÷¹ÜÀíµÄ²éѯ¶øÇÒÒѾÔÚ cache ÀïÃæÁ˻ḽ¼ÓÒ»¸ö¡°Non-authoritative answer:¡±µÄ»ØÓ¦ÐÅÏ¢¡£µ«Èç¹ûÎÒÃÇÏȽ«²éѯģʽÉèΪanyÖ®ááÔÙÊäÈëͬÑùµÄÖ÷»úÃû³Æ
> set q=any
> pii266.siyongc.domain
Server: redhat52.siyongc.domain
Address: 192.168.0.17
pii266.siyongc.domain preference = 20, mail exchanger = debian.home
pii266.siyongc.domain preference = 10, mail exchanger = redhat52.siyongc.domain
pii266.siyongc.domain internet address = 192.168.0.15
siyongc.domain nameserver = debian.home
siyongc.domain nameserver = redhat52.siyongc.domain
debian.home internet address = 192.168.0.2
redhat52.siyongc.domain internet address = 192.168.0.17
Äú¾Í¿ÉÒÔ¿´µ½¸ü¶àµÄ×ÊÁÏÁËÀýÈçMXNSºÍËüÃǵÄIPµØÖ·µÈÐÅÏ¢¡£¼ÙÈçÄúʹÓá°³ý´íģʽ¡±µÄ»°¿´µ½µÄ×ÊÁÏ»¹½«¸ü¶à
> set debug
>
www.hinet.net
Server: redhat52.siyongc.domain
Address: 192.168.0.17
;; res_nmkquery(QUERY,
www.hinet.net, IN, ANY)
------------
Got answer:
HEADER:
opcode = QUERY, id = 3102, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 3, additional = 3
QUESTIONS:
www.hinet.net, type = ANY, class = IN
ANSWERS:
->
www.hinet.net
canonical name = w3c2.hinet.net
ttl = 76134 (21h8m54s)
AUTHORITY RECORDS:
-> hinet.net
nameserver = HNTP1.hinet.net
ttl = 162533 (1d21h8m53s)
-> hinet.net
nameserver = HNTP3.hinet.net
ttl = 162533 (1d21h8m53s)
-> hinet.net
nameserver = DNS.hinet.net
ttl = 162533 (1d21h8m53s)
ADDITIONAL RECORDS:
-> HNTP1.hinet.net
internet address = 168.95.192.1
ttl = 162533 (1d21h8m53s)
-> HNTP3.hinet.net
internet address = 168.95.192.2
ttl = 162533 (1d21h8m53s)
-> DNS.hinet.net
internet address = 168.95.1.1
ttl = 162533 (1d21h8m53s)
------------
Non-authoritative answer:
www.hinet.net
canonical name = w3c2.hinet.net
ttl = 76134 (21h8m54s)
Authoritative answers can be found from:
hinet.net
nameserver = HNTP1.hinet.net
ttl = 162533 (1d21h8m53s)
hinet.net
nameserver = HNTP3.hinet.net
ttl = 162533 (1d21h8m53s)
hinet.net
nameserver = DNS.hinet.net
ttl = 162533 (1d21h8m53s)
HNTP1.hinet.net
internet address = 168.95.192.1
ttl = 162533 (1d21h8m53s)
HNTP3.hinet.net
internet address = 168.95.192.2
ttl = 162533 (1d21h8m53s)
DNS.hinet.net
internet address = 168.95.1.1
ttl = 162533 (1d21h8m53s)
ÁíÍâÄú»¹¿ÉÒÔÓà set q=mx »ò set q=ptr µÈģʽÀ´²éÑ¯ÌØ¶¨µÄ¼Ç¼Ҳ¿ÉÒÔÓà ls áá½Ó domain name À´²é¿´Ä³¸ö domain µÄËùÓÐÖ÷»ú¼Ç¼¡£ÉÆÓà nslookup ÎÒÃÇ¿ÉÒÔÕÒµ½Ðí¶à DNS µÄÐÅÏ¢¶øµ±ÓÐÎÊÌâ·¢ÉúµÄʱºòÕâ¸ö
¹¤¾ß¾Í±äµÃ·Ç³£ÓÐÓÃÁË¡£