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DNS是什么？

網站輸入域名，daxian001 --->10.0.0.10 從域名解析到IP ?就緒需要DNS

DNS能干什么

A記錄 www.daxian001.com --->10.0.0.10

mx解析記錄 ?123456@qq.com ? 郵件服務

PTR反向解析 ?10.0.0.10 -->www.daxian001.com

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DNS解析流程原理

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DNS解析命令

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dig 查看解析過程

dig @8.8.8.8 www.baidu.com +trace

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6 <<>> @8.8.8.8 www.baidu.com +trace
; (1 server found)
;; global options: +cmd
. 39456 IN NS m.root-servers.net.
. 39456 IN NS c.root-servers.net.
. 39456 IN NS h.root-servers.net.
. 39456 IN NS g.root-servers.net.
. 39456 IN NS k.root-servers.net.
. 39456 IN NS l.root-servers.net.
. 39456 IN NS e.root-servers.net.
. 39456 IN NS i.root-servers.net.
. 39456 IN NS j.root-servers.net.
. 39456 IN NS b.root-servers.net.
. 39456 IN NS d.root-servers.net.
. 39456 IN NS a.root-servers.net.
. 39456 IN NS f.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 76 ms

com. 172800 IN NS m.gtld-servers.net.
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
;; Received 491 bytes from 192.33.4.12#53(192.33.4.12) in 291 ms

baidu.com. 172800 IN NS dns.baidu.com.
baidu.com. 172800 IN NS ns2.baidu.com.
baidu.com. 172800 IN NS ns3.baidu.com.
baidu.com. 172800 IN NS ns4.baidu.com.
baidu.com. 172800 IN NS ns7.baidu.com.
;; Received 201 bytes from 192.33.14.30#53(192.33.14.30) in 301 ms

www.baidu.com. 1200 IN CNAME www.a.shifen.com.
a.shifen.com. 1200 IN NS ns4.a.shifen.com.
a.shifen.com. 1200 IN NS ns2.a.shifen.com.
a.shifen.com. 1200 IN NS ns1.a.shifen.com.
a.shifen.com. 1200 IN NS ns5.a.shifen.com.
a.shifen.com. 1200 IN NS ns3.a.shifen.com.
;; Received 228 bytes from 220.181.38.10#53(220.181.38.10) in 7 ms

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nslookup解析域名

[root@web01 ~]# nslookup > baidu.com Server: 192.168.20.20 Address: 192.168.20.20#53Non-authoritative answer: Name: baidu.com Address: 220.181.57.217 Name: baidu.com Address: 123.125.114.144 Name: baidu.com Address: 111.13.101.208

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host解析

host www.baidu.com www.baidu.com is an alias for www.a.shifen.com. www.a.shifen.com has address 119.75.213.61 www.a.shifen.com has address 119.75.216.20

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ping域名

[root@web01 ~]# ping www.baidu.com PING www.a.shifen.com (119.75.213.61) 56(84) bytes of data. 64 bytes from 119.75.213.61: icmp_seq=1 ttl=53 time=3.94 ms 64 bytes from 119.75.213.61: icmp_seq=2 ttl=53 time=3.26 ms 64 bytes from 119.75.213.61: icmp_seq=3 ttl=53 time=3.33 ms 64 bytes from 119.75.213.61: icmp_seq=4 ttl=53 time=3.55 ms 64 bytes from 119.75.213.61: icmp_seq=5 ttl=53 time=3.27 ms 64 bytes from 119.75.213.61: icmp_seq=6 ttl=53 time=3.44 ms 64 bytes from 119.75.213.61: icmp_seq=7 ttl=53 time=3.24 ms 64 bytes from 119.75.213.61: icmp_seq=8 ttl=53 time=3.47 ms 64 bytes from 119.75.213.61: icmp_seq=9 ttl=53 time=3.39 ms

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轉載于:https://www.cnblogs.com/sky00747/p/8267786.html

總結

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