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a,最简单的方法[root@rudder ~]# nslookup baidu.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: baidu.com
Address: 123.125.114.144
Name: baidu.com
Address: 220.181.111.85
Name: baidu.com
Address: 220.181.111.86
nslookup,交互方式,查看dns[root@rudder ~]# nslookup
> www.baidu.com
Server:172.17.0.254
Address:172.17.0.254#53
Non-authoritative answer: #非权威答案,表明是在缓存中读取的
www.baidu.comcanonical name = www.a.shifen.com.
Name:www.a.shifen.com
Address: 61.135.169.105 #返回第一个IP地址
Name:www.a.shifen.com
Address: 61.135.169.125 #返回第二个IP地址
> server 8.8.8.8 #设置域名服务器为 8.8.8.8
Default server: 8.8.8.8
Address: 8.8.8.8#53
> www.baidu.com #再次请求百度的IP地址
Server:8.8.8.8
Address:8.8.8.8#53
Non-authoritative answer:
www.baidu.comcanonical name = www.a.shifen.com.
Name:www.a.shifen.com
Address: 220.181.111.147 #不同的DNS获取的IP地址是不同的。
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