1.
MAC<--ARP-->IP
IP<---DNS-->DOMAIN
2.ÍøÂç´«ËÍ×ÊÁϵķ½·¨²¢²»ÊÇÖ»ÓÐTCP/IPÐÒ飬±ÈÈçÔÚLANÀï¾³£Óõ½µÄ¿ÉÄÜÊÇNetBIOS
3.DNSµÄÓÉÀ´
==>ΪÁ˽â¾öÍøÂç´«ËÍ×ÊÁÏʱIPµØÖ·ÄÑÒÔ¼ÇÒäµÄÎÊÌ⣬¾ÍÓÐÁËÀûÓÃÄ³Ð©ÌØ¶¨µÄµµ°¸½«Ö÷»úÃû³ÆÓëIP¶ÔÓ¦ÆðÀ´£¬ÕâÑù¾Í¿ÉÒÔͨ¹ýÖ÷»úÃû³ÆÀ´È¡µÃ¸ÃÖ÷»úµÄIPÁË£¬Ò²¾Í¿ÉÒÔÍê³É×ÊÁϵĴ«ËÍÁË¡£
==>¿ÉÊÇÖ÷»úÃû³ÆÓëIPµÄ¶ÔÓ¦ÎÞ·¨×Ô¶¯ÓëËùÓеĵçÄÔÄÚ¸üУ¬ÇÒµ±IPÊýÁ¿Ì«¶àʱ£¬¸Ãµµ°¸¾Í»á´óµ½²»Ïñ»°£¬Ò²¾Í¸ü²»ÀûÓÚÖ÷»úͬ²½»¯¡£
==>°Ø¿ËÀ³´óѧ·¢Õ¹³öÁËÒ»Ì׽ײãʽ¹ÜÀíÖ÷»úÃû³Æ¶ÔÓ¦IPµÄϵͳ£¬³ÆÖ®ÎªBIND(Berkeley Internet Name Domain)
==>½ø¶ø·¢Õ¹³ÉΪȫÊÀ½çʹÓÃ×î¹ã·ºµÄÓòÃûϵͳDNS
4.DNSÓëBINDµÄÇø±ð
DNS----Ò»ÖÖÖ÷»úÃû³ÆÓëIPµÄ½âÎöÐÒé
BIND----ÌṩDNS·þÎñµÄÌ×¼þ
5./etc/hosts
ping -c 5 localhost
windowsÏÂÃæ¶ÔÓ¦µÄÎļþΪ£ºc:\i386\hosts
Õâ¸ö»á¼Ó¿ìIPµÄËÑѰËÙ¶È
¿ÉÒÔ³¢ÊÔÒ»ÏÂ
6./etc/hostsÓëDNSÏµÍ³Çø±ð£º
/etc/hosts----Ö±½ÓÔÚClient¶ËµÄµµ°¸ÄÚÊäÈëÖ÷»úÃû³Æ¶ÔÓ¦µÄIPÀ´²éѯ
DNSϵͳ----ÀûÓöîÍâµÄDNS·þÎñ£¬ÈÃclient¶Ë¿ÉÒÔͨ¹ýÃû³Æ½âÎöÀ´È¡µÃÄ¿µÄµØÖ÷»úµÄIP
7.Domain NameÓëHostnameµÄÇø±ð£º
Domain Name----
Hostname----
ÎÒÃÇÒѾ֪µÀDNSϵͳÊǸö·Ö²ã´ÎµÄϵͳ£¬ËùÒÔÔÚÿһ²ãÉÏÓòÃûÓëÖ÷»úÃûÊDz»Ò»ÑùµÄ
Èçwww.yahoo.comÖÐÓòÃûΪyahoo.com£¬Ö÷»úÃûΪwww
ÓÖÈçyahoo.comÖÐÓòÃûΪ.com£¬Ö÷»úÃûΪyahoo
8.DNS¼Ü¹¹
ÿ¸öÉÏÒ»²ãµÄDNSÖ÷»ú£¬Ëù¼Ç¼µÄ×ÊѶ£¬ÆäʵֻÓÐÆäÏÂÒ»²ãµÄÖ÷»úÃû³Æ¶øÒÑ£¡£¡
DNSÊ÷״Ŀ¼
root
____________________________________________________
| | | | | | |
com edu gov mil org cn ÆäËû¹ú¼Ò
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com.cn edu.cn gov.cn mil.cn org.cn
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sina.com.cn yahoo.com.cn others.com.cn
com: ÉÌÒµ¡¢¹«Ë¾
org: ×éÖ¯¡¢»ú¹¹
edu: ½ÌÓý
gov: Õþ¸®
net: ÍøÂ硢ͨѶ
mil: ¾üÊÂ
9.DNSµÄËÑѰÁ÷³Ì
DNSÊÇÒÔÀàËÆÊ÷״Ŀ¼µÄÐÎ̬À´¹ÜÀíÓòÃûµÄ£¬Ã¿Ò»²¿DNSÖ÷»úÖ»¹ÜÀíÏÂÒ»²ãDNSÖ÷»úµÄÓòÃû½âÎö
ÖÁÓÚϲãµÄϲ㣬ÔòÊÚȨ¸øÏ²ãµÄDNSÖ÷»úÀ´¹ÜÀí
DNS·þÎñÆ÷¹¤×÷ÔÀí
¿Í»§¶ËlinuxÖ÷»úÀûÓÃ/etc/resolv.confÖÐÌṩµÄDNS·þÎñÆ÷µÄIPÀ´½øÐвéѯ
DNS·þÎñÆ÷»áÕâÑù×ö£º
¼ÙÉèÒª·ÃÎÊ
(1) ÏÈ¿´±¾ÉíÓÐûÓмǼ
(2) Ïò×î¶¥²ã²éѯ
Ïò×î¶¥²ãµÄ.(root)ÕⲿÖ÷»úÀ´²éѯ.(root)µÄÏÂÒ»²ã.cn
(3) ÏòµÚ¶þ²ã²éѯ
¾Íµ½.cn²éѯ£¬ÕÒµ½.edu.cn
(4) ½Ó×ÅÒ»²½Ò»²½ÏÂÀ´
(5) ¼Ç¼ÔÝ´æ¼ÇÒäµµ
²éÕÒÒªÕÒµÄIPºó£¬¾Í½«£¬¶ÔÓ¦µÄIPÐÅÏ¢ÔÚ×Ô¼ºµÄÔÝ´æ¼ÇÒäµµÖб£´æÆðÀ´
Õâ¸öÔÝ´æµµÊÇÓÐʱ¼äÐԵ쬵±¹ýÁËDNSÉ趨¼ÇÒäµÄʱ¼ä(ͨ³£ÊÇ24Сʱ)£¬¸Ã¼ÇÒä¾Í»á±»ÊÍ·Å
¼¸µã×¢Ò⣺
a> Ö»ÓÐÓòÃûÊǾ¹ýÉϲãºÏ·¨µÄDNSÖ÷»úÉ趨µÄ£¬²Å¿ÉÒÔÔÚINTERNETÉϱ»²éѯµ½
b> Ö÷»úµÄÔÝ´æ¼ÇÒäµµ£¬ÊÇÓÐʱ¼äÐԵģ¬ËùÒÔµ±ÐÞ¸ÄÒ»¸öÓòÃûÖ®ºó£¬¿ÉÄÜÒª2~3Ìì²ÅÄÜÈ«ÃæµÄÆôÓÃ
c> ÿһ²¿¿ÉÒԼǼÖ÷»úÃû³ÆÓëIP¶ÔÓ¦µÄDNS·þÎñÆ÷¶¼¿ÉÒÔËæÒâ¸ü¶¯Ëû×Ô¼ºµÄ×ÊÁϿ⣬עÒ⣬ÊÇËû×Ô¼ºµÄ
10.DNSʹÓõĶ˿Ú
cat /etc/services | grep domain
¿ÉÒÔ¿´µ½DNSʹÓõĶ˿ÚΪ53
ͨ³£½øÐÐDNS²éѯʱ£¬ÊÇÒÔUDPÕâ¸ö½Ï¿ìËÙµÄ×ÊÁÏ´«ÊäÐÒéÀ´²éѯµÄ£¬µ«ÈôûÓвéѯ£¬»áÔÙ´ÎÒÔTCP²éѯ¡£
ËùÒÔÆô¶¯DNSµÄdaemon(¼´named)£¬»áͬʱÆô¶¯TCP¼°UDPµÄ53Õâ¸ö¶Ë¿Ú¡£
11.ÒªÈÃÄãµÄÖ÷»úÃû³Æ¶ÔÓ¦IPÇÒÈÃInternetÉϵĵçÄÔ¶¼¿ÉÒÔ²éѯµÄµ½£¬¾ÍÐèÒª£º
(1) ÉϲãDNS ÊÚȨÈÃÄãÉ趨DNSÖ÷»ú£¬»òÕß
(2) Ö±½ÓÇëÉϲãDNSÖ÷»úÀ´°ïÄãÉ趨
12.ʲôÊÇÕý½âÓë·´½â£¿
(1) Õý½â
ÓÉÖ÷»úÃûȥѰÕÒIPµÄ³ÌÐò³ÆÎªÕý½â
(2) ·´½â
ÓÉIPÈ¥²éѯµÃµ½Ö÷»úÃû¾Í³ÆÎª·´½â
(3) ÇøÓò(Zone)
Ò»¸öÕý½â»ò·´½âµÄÉ趨¾ÍÊÇÒ»¸özone
È磬ÒÔÄñ¸çµÄvbird.idv.twΪÀý£¬Ò»¸öÓòÃûµÄDNSÉ趨µµÀï±ØÐèÓÐ
¡£hint(root)µÄÉ趨
¡£vbird.idv.twÕâ¸öÓòÃûµÄÕý½âÉ趨
¡£localhostµÄÕý½âÉ趨(·Ç±ØÒª)
¡£localhostµÄ·´½âÉ趨(·Ç±ØÒª)
ÄÇô¾ÍÓÐËĸözone
13.DNS serverʹÓõÄÊÇbindÕâ¸öÌ×¼þ£¬ËûµÄÖ÷Òª²ÎÊýµµÊÇ/etc/named.conf
14.²éѯDNSÊÇ·ñ°²×°
(1)
# rpm -qa | grep bind
bind-utils-9.2.4-16.EL4 <==ÊÇÓû§¶ËËÑѰÖ÷»úÃû³ÆµÄÏà¹ØÖ¸Áî
bind-9.2.4-16.EL4 <==DNS·þÎñÆ÷Ö÷³ÌÐò
bind-chroot-9.2.4-16.EL4 <==½«bindÖ÷³ÌÐò¹ØÔÚ¼ÒÀï?
ÄǸöchroot¼´change to root£¬ÄǸöroot´ú±íµÄÊǸùĿ¼
¿ÉÒÔÓøÃÃüÁîÀ´½«Ä³¸öĿ¼ָ¶¨Îªbind³ÌÐòµÄ¸ùĿ¼£¬ÓÉÓÚÊǸùĿ¼£¬ËùÒÔbind±ã²»ÄÜÀ뿪¸ÃĿ¼¡£
CentOSĬÈϽ«bindËøÔÚ/var/named/chrootÖÐ
(2)
yum install bind
15.BINDµÄĬÈÏÉ趨
/etc/named.conf ----É趨µµ
/etc/sysconfig/named ----ÊÇ·ñÆô¶¯chroot¼°¶îÍâµÄ²ÎÊý£¬ÓÉÕâ¸öµµ°¸¿ØÖÆ
/var/named/ ----×ÊÁϿ⵵°¸Ä¬ÈÏ·ÅÖÃÔÚÕâ¸öĿ¼
/var/run/named ----namedÕâÈ¥³ÌÐòÖ´ÐÐʱĬÈÏ·ÅÖÃpid-fileÔÚ´ËĿ¼ÄÚ
¿Éͨ¹ý²é¿´/etc/sysconfig/namedÀ´²é¿´chrootËùÖ¸¶¨µÄĿ¼
# vi /etc/sysconfig/named
ROOTDIR=/var/named/chroot
ÕâÑùbindµÄÏà¹Ø³ÌÐòËùÐèÒªµÄËùÓÐ×ÊÁÏ»áÊÇÔÚ£º
/var/named/chroot/etc/named.conf
/var/named/chroot/var/named/zone_file1
/var/named/chroot/var/named/zone_file...
/var/named/chroot/var/run/named/...
²»¹ý£¬ÈԾɿÉÒÔʹÓÃ/etc/named.confÀ´É趨ÄãµÄDNS
ÒòΪϵͳ»áÖ÷¶¯µÄ°ïÄ㽫/var/named/chroot/etc/named.confÁ´½Óµ½/etc/named.conf
16.DNSµÄmaster/slave¼Ü¹¹
master----±¾Éí¾ßÓÐÌṩInternet²éѯËùÐèµÄ×ÊÁÏ
slave----
Cache-only----ÕâÖÖDNSÖ÷»úûÓÐ×Ô¼ºµÄ×ÊÁϿ⣬µ¥´¿°ïÖúClient¶ËÏòÍⲿµÄDNSÖ÷»úÒªÇó×ÊÁ϶øÒÑ¡£´úÀí?
17.Cache-onlyµ¥´¿µÄforward DNSÖ÷»úÉ趨
(1) ±à¼Ö÷ÒªÉ趨µµ /etc/named.conf
a> ×¢ÊÍÓÃ"//"
b> ÿ¸ö¶ÎÂäÖ®ºóÒªÓÃ";"½áÊø
c> ʵÀý£º
------------------------------------------------------------------
[root@linux ~]# vi /etc/named.conf
// ËäÈ» CentOS ½«Õâ¸öµµ°¸·ÅÖõ½ /var/named/chroot/etc µ±ÖУ¬
// ²»¹ýËûºÜºÃÐĵİïÎÒÃÇ×÷Á˸öÁ¬½á£¬ËùÒÔÄ㻹ÊÇ¿ÉÒÔÖ±½Ó±à¼Õâ¸öµµ°¸À²£¡
options {
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
pid-file "/var/run/named/named.pid";
forward only; //Ö»ÔÊÐí forward!
forwarders {
168.95.1.1; //ÎÒÕâÀïʹÓà hinet µÄ DNS £¡
139.175.10.20; //Õâ¸öÊÇ seednet µÄ DNS £¡
};
};
include "/etc/rndc.key";
------------------------------------------------------------------
ÕâÀïҪȷÈÏһϣ¬pid-fileµÄËùÓÐÈ˱ØÐëÊÇnamedÕâ¸öuser²ÅÐÐ
[root@linux ~]# ls -ald /var/named/chroot/var/run/named
drwxrwx--- 2 named named 4096 Oct 12 11:48 /var/named/chroot/var/run/named
(2) Æô¶¯named
# /etc/init.d/named start
(3) ¹Û²ìportµÄ±ä»¯
²¢²»Ò»¶¨Æô¶¯Ê±³É¹¦¾Í±íÃ÷DNS³É¹¦ÁË£¬»¹ÒªÀ´¿´Ò»ÏÂport 53ÓÐûÓÐÆô¶¯
# netstat -utln
(4) ¼ì²é/var/log/messagesµÄÐÅÏ¢
tail -n 15 /var/log/messages | grep named
Oct 16 15:08 linux named[76]: starting BIND 9.2.4 -u named -t /var/named/chroot <==³É¹¦Æô¶¯
(5) ¿Í»§¶Ë²âÊÔ
18.DNS·þÎñÆ÷С½á£º
a> Ö÷ÒªÉ趨µµÊÇ/etc/named.conf
b> ÿ¸öÕý½â¡¢·´½â¶¼ÐèÒªÒ»¸öµµ°¸£¬¶øµµ°¸µÄµµÃûÊÇÓÉ/etc/named.confËùÉ趨µÄ
c> ĿǰµÄBIND³ÌÐòÒѾ½øÐÐchrootÁË£¬¿ÉÒԲο¼/etc/sysconfig/named
d> µ±DNS²éѯʱ£¬Èô±¾ÉíûÓÐ×ÊÁϿ⣬ÔòǰÍùroot(.)»òforwardersÖ÷»ú²éѯ
e> DNS·þÎñÆ÷µÄ¼ÜÉèÐèÒªÉϲãDNSµÄÊÚȨ²Å¿ÉÒÔ³ÉΪºÏ·¨µÄDNS·þÎñÆ÷£¬·ñÔòÖ»ÄÜÊÇÄÚ²¿µÄ
f> namedÊÇ·ñÆô¶¯³É¹¦Îñ±ØÒª²éÔÄ/var/log/messagesÄÚµÄÐÅÏ¢
19.Ò»¸öÄÚ²¿µÄDNS·þÎñÆ÷µÄ¼ÜÉè°¸Àý
[Ä¿±ê¼°»·¾³]
¸ÃDNS·þÎñÆ÷Õë¶Ôvbird.tsaiÕâ¸öÓòÃûÀ´Éè¼Æ£¬²¢ÇÒ¶ÔÓ¦µÄ·´½âΪ192.168.1.0/24
ÁíÍ⻹Õë¶Ô±¾»úlocalhostÒÔ¼°127.0.0.1Õâ¸öÔ¤ÉèµÄÁìÓòÀ´¶ÔÓ¦
µ±È»»¹Òª°üº¬×îÉϲã.(root)Õâ¸öÓòÃûµÄÖ÷»úÃû×ÊÁÏ¿â
ËùÒÔ£¬É趨µµ¼°Õý·´½âzoneµÄ×ÊÁϿ⵵°¸Ó¦¸ÃÓУº
(1) named.conf É趨µµ
(2) named.vbird.tsai vbird.tsaiµÄÕý½â
(3) named.192.168.1 192.168.1.0/24µÄ·´½â
(4) named.root .(root)µÄ×ÊÁÏ¿â
(5) named.localhost localhostµÄÕý½â
(6) named.127.0.0 127.0.0.1/24µÄ·´½â
Èç¹û»¹Ïë¼ÓÈëÆäËûµÄÓòÃû£¬ÀýÈçniki.tsai£¬ÄǾÍÔÙ¶àÒ»¸ö×ÊÁÏ¿âÕý½âµµ°¸¼´¿É£¡
×ÊÁÏ¿âµÄ¶ÔÓ¦£º
²Ù×÷ϵͳÓëIP ¶ÔÓ¦Ö÷»úÃû ˵Ã÷
linux 192.168.1.254 linux.vbird.tsai ÕⲿÊÇÖ÷ÒªµÄDNS·þÎñÆ÷£¬Ö÷ÒªÖ÷»úÃûΪ www.vbird.tsai linux.vbird.tsai,ÆäËûµÄÈý¸öÖ÷»úÃû
ftp.vbird.tsai ΪÖ÷»ú±ðÃû
forum.vbird.tsai
linux 192.168.1.150 slave.vbird.tsai Ö÷Òª×÷Ϊslave DNSÖ÷»ú
winxp 192.168.1.100 winxp.vbird.tsai ijһ²¿Ö÷»úµÄIPÓëÖ÷»úÃû¶ÔÓ¦
sun 192.168.1.200 sun.vbird.tsai ÁíÒ»²¿Ö÷»ú
¡ï/etc/named.confµÄÉ趨µµ
a> ¹¦ÄÜ£º
¡£¹æ·¶DNS·þÎñÆ÷µÄʹÓÃȨÏÞ(¿É·ñ²éѯ¡¢forwardÓë·ñ¡¢master/slave¼Ü¹¹µÈ)
¡£É趨³özone(domain name)ÒÔ¼°zone fileµÄËùÔÚ
¡£É趨DNS±¾»ú¹ÜÀí½çÃæÒÔ¼°ÆäÏà¹ØµÄkey file
b> ×¢Ò⣺
ÔÚÕûÌå·þÎñÆ÷»·¾³ÓëʹÓÃȨÏÞ£¬Ö÷ÒªÊÇͨ¹ýoptions {...}À´É趨µÄ
c> ×î¼òµ¥µÄ¹æ»®Ê¾Àý£º
-----------------------------------------------------------------
[root@linux ~]# vi /etc/named.conf
// Ïȶ¨Òå³öÕû¸ö DNS ·þÎñÆ÷µÄÏà¹Ø»·¾³£¬°üÀ¨²éѯ¡¢µµ°¸·ÅÖÃĿ¼µÈ
options {
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
pid-file "/var/run/named/named.pid";
forwarders { 168.95.1.1; 139.175.10.20; };
allow-query { any; }; // ÊÇ·ñÔÊÐí±»²éѯ£¿µ±È»Òª¿ÉÒÔ±»²éѯ£»
allow-transfer { none; }; // ÊÇ·ñÔÊÐí´«ËÍ zone £¬Ô¤Éè²»¿É
};
// ¹ØÓÚ DNS ·þÎñÆ÷µÄһЩ¼ÓÃÜÊý¾Ý£¬ÏȺöÂÔ¹ýÈ¥ÏÈ£¡
include "/etc/rndc.key";
// ¹ØÓÚ root (.) µÄÉ趨รº
zone "." {
type hint; // ÌØÊâµÄÀà±ð£¡×¨¸ø root (.) ÓõÄ
file "named.root"; // ¾ÍÊǵµÃûµÄ¶¨ÒåÀ²£¡
};
// ¹ØÓÚ±¾»ú localhost µÄÕý·´½â
zone "localhost" {
type master;
file "named.localhost";
};
zone "0.0.127.in-addr.arpa" {
type master;
file "named.127.0.0";
};
// ÕâÀï¹æ·¶³öÎÒÃÇµÄ vbird.tsai ÁìÓòÃû
zone "vbird.tsai" {
type master;
file "named.vbird.tsai";
};
zone "1.168.192.in-addr.arpa" {
type master;
file "named.192.168.1";
};
-----------------------------------------------------------------
d> optionsÄڵIJÎÊý˵Ã÷
É趨ֵ ÒâÒå
directory Ö¸¶¨zone fileÒª·ÅÖÃÔÚÄĸöĿ¼£¬ÓëzoneÉ趨ÏîÄ¿µÄfileÅäºÏ¶ø³ÉÍêÕûµÄµµÃû
dump-file Ö¸¶¨ÔÝ´æ×ÊÁϼǼµ½Äĸöµµ°¸
statistics-file DNSµÄһЩͳ¼Æ×ÊÁÏдÈëµÄµµ°¸
pid-file ½«namedÕâ¸ö³ÌÐòµÄPID¼Ç¼ÏÂÀ´µÄÒ»¸öµµ°¸£¬Õâ¸öµµ°¸Í¨³£ÔÚnamedÆô¶¯¡¢¹Ø±ÕʱÌṩ ÕýÈ·µÄPID
forwarders
allow-query ÊÇ·ñÔÊÐíÓû§¶ËµÄ²éѯ£¬ÄÚÈÝ¿ÉÒÔΪanyÈκÎÀ´Ô´»òIP»òÍø¶Î(IP/netmask)
allow-transfer ÊÇ·ñÔÊÐíslave DNSÕû¸öÓòÃû×ÊÁϵĴ«ËÍ£¬³ý·ÇÄãÓÐslave DNS·þÎñÆ÷£¬·ñÔòÕâÀï²»Òª ¿ª·Å
e> zoneÄڵIJÎÊý˵Ã÷
É趨ֵ ÒâÒå
type Ö÷ÒªÀàÐÍÓУºmaster,slave¼°hint¡£ÆäÖУ¬×îÉϲã.ʹÓõÄÊÇhintÀàÐÍ£¬È»ºómasterÖ÷ »úÓÃmaster,slaveÖ÷»ú¾ÍÓÃslave
file ¾ÍÊÇzone file£¬ÍêÕûµÄzone file·ÅÔÚÄÄÀ
[chroot_dir]/[optionsÄÚµÄdirectory]/[file É趨ֵ]£¬ËùÒÔ˵
root(.)É趨µµ¾ÍÔÚ£º/var/named/chroot/var/named/named.root
·´½âzone ·´½â£¬±ØÐëÒª½«IP·´¹ýÀ´Ð´£¬²¢ÔÚ×îºóÃæ¼ÓÉÏ".in-addr.arpa"À´±íʾ·´½â¡£
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