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cname对应的权威解析。查看全部
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DNS解析记录分类： 1、A记录：由域名服务器返回IP地址（基本、最多的记录） 2、CNAME：方便多个域名解析同一个IP地址（如图创建一个CNAME记录指向有A记录的域名） 3、NS记录：bind服务器不能进行权威解析时，会回一个NS记录给用户，这时用户再发起另一台bind服务器的权威解析请求。 4、MX记录：全称是邮件交换记录，在使用邮件服务器的时候，MX记录是无可或缺的，比如A用户向B用户发送一封邮件，那么他需要向DNS查询B的MX记录，DNS在定位到了B的MX记录后反馈给A用户，然后A用户把邮件投递到B用户的MX记录服务器里。查看全部
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Cname作用：多个域名指向同一个IP查看全部
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如果本地服务器无法返还IP地址就会去.跟域下一级一级迭代查询，最终返还准确IP地址。查看全部
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根域很重要，它可以迭代向前查询。用点表示。。com是一级域名。再往前是二级域名。查看全部
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BIND是一种开源的DNS（Domain Name System）协议的实现，包含对域名的查询和响应所需的所有软件。它是互联网上最广泛使用的一种DNS服务器，查看全部
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tips查看全部
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tips查看全部
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dig -t查询单独的记录： #dig -t a baidu.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> -t a baidu.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48165 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;baidu.com. IN A ;; ANSWER SECTION: baidu.com. 227 IN A 220.181.57.217 baidu.com. 227 IN A 180.149.132.47 baidu.com. 227 IN A 123.125.114.144 baidu.com. 227 IN A 111.13.101.208 ;; Query time: 36 msec ;; SERVER: 114.114.114.119#53(114.114.114.119) ;; WHEN: Mon Aug 29 20:51:30 2016 ;; MSG SIZE rcvd: 91查看全部
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#nslookup www.baidu.com Server:114.114.114.119 Address:114.114.114.119#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. Name:www.a.shifen.com Address:14.215.177.37 Name:www.a.shifen.com Address:14.215.177.38 nslookup可以进入交互模式单独查找SOA，A等等记录 #nslookup >set q=soa >baidu.com Server:114.114.114.119 Address:114.114.114.119#53 Non-authoritative answer: baidu.com origin = dns.baidu.com mail addr = sa.baidu.com serial = 2012132847 refresh = 300 retry = 300 expire = 2592000 minimum = 7200 Authoritative answers can be found from: >set q=a >baidu.com Server:114.114.114.119 Address:114.114.114.119#53 Non-authoritative answer: Name:baidu.com Address:180.149.132.47 Name:baidu.com Address:123.125.114.144 Name:baidu.com Address:111.13.101.208 Name:baidu.com Address:220.181.57.217查看全部
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#host www.baidu.com #host -t SOA baidu.com baidu.com has SOA record dns.baidu.com. sa.baidu.com. 2012132847 300 300 2592000 7200 #host -t NS baidu.com baidu.com name server dns.baidu.com. baidu.com name server ns2.baidu.com. baidu.com name server ns3.baidu.com. baidu.com name server ns4.baidu.com. baidu.com name server ns7.baidu.com. #host -t A baidu.com baidu.com has address 220.181.57.217 baidu.com has address 123.125.114.144 baidu.com has address 111.13.101.208 baidu.com has address 180.149.132.47查看全部
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host文件位置：/etc/resolv.conf # host www.baidu.com www.baidu.com is an alias for www.a.shifen.com. www.a.shifen.com has address 14.215.177.38 www.a.shifen.com has address 14.215.177.37 #nslookup www.baidu.com Server: 114.114.114.119 Address: 114.114.114.119#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. Name: www.a.shifen.com Address: 14.215.177.38 Name: www.a.shifen.com Address: 14.215.177.37 #dig www.baidu.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> www.baidu.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33977 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.baidu.com. IN A ;; ANSWER SECTION: www.baidu.com. 546 IN CNAME www.a.shifen.com. www.a.shifen.com. 199 IN A 14.215.177.38 www.a.shifen.com. 199 IN A 14.215.177.37 ;; Query time: 42 msec ;; SERVER: 114.114.114.119#53(114.114.114.119) ;; WHEN: Mon Aug 29 20:33:36 2016 ;; MSG SIZE rcvd: 90查看全部
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逆向解析重点总结： 1.逆向解析域in-addr.arpa的书写格式 2.常用于邮件服务的域名解析 3.配置文件权限需要named用户可读取，没有权限启动named服务会报错 -rw-r--r--. 1 root root 191 Aug 29 19:40 192.168.199.zone查看全部
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实战场景3代码： 1.编辑/var/named/imooc.com.zone文件 $TTL 7200 imooc.com. IN SOA imooc.com. ho.imooc.com. (222 1H 15M 1W 1D) imooc.com. IN NS dns1.imooc.com. dns1.imooc.com. IN A 192.168.199.202 www.imooc.com. IN A 117.121.101.41 @ IN MX 10 mail mail IN A 192.168.199.203 2.重启named服务 service named restart 3.正向解析本机检测 dig @127.0.0.1 mail.imooc.com 4.配置反向解析域，编辑/etc/named.conf文件 options{ directory "/var/named"; }; zone "imooc.com"{ type master; file "imooc.com.zone"; }; zone "iaskjob.com"{ type master; file "iaskjob.com.zone"; }; zone "199.168.192.in-addr.arpa"{ type master; file "192.168.199.zone"; }; 5.编辑/var/named/192.168.199.zone文件 $TTL 3600 @ IN SOA 199.168.192.in-addr.arpa. iaskjob.163.com. ( 2014012200 1H 15M 1W 1D ) @ IN NS dns1.imooc.com. 202 IN PTR dns1.imooc.com. 203 IN PTR mail.imooc.com. 6.重启named服务 service named restart 7.反向解析本机测试 dig -x 192.168.199.203 @127.0.0.1查看全部
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正反向解析查看全部
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