/etc/resolv.conf文件;
记录DNS服务器的地址和域名;
关键字：;
domainname;
nameserver;
#;more;/etc/resolv.conf;
nameserver;172.16.255.3;
domainname;sunrise.com.cn;

/etc/nsswitch.conf文件;
记录主机名的搜索顺序等信息;
#;more;/etc/nsswitch.conf;
#;
#;/etc/nsswitch.dns:;
#;
#;An;example;file;that;could;be;copied;over;to;/etc/nsswitch.conf;;it;uses;
#;DNS;for;hosts;lookups,;otherwise;it;does;not;use;any;other;naming;service.;
#;
#;"hosts:";and;"services:";in;this;file;are;used;only;if;the;
#;/etc/netconfig;file;has;a;"-";for;nametoaddr_libs;of;"inet";transports.;

passwd:;;;;;files;
group:;;;;;;files;
#;You;must;also;set;up;the;/etc/resolv.conf;file;for;DNS;name;
#;server;lookup.;;See;resolv.conf(4).;
hosts:;;;;;;files;dns;
ipnodes:;;;;files;
…;
…;

将这个文件的hosts记录配置成hosts:;;;;;;files;dns;

nslookup命令;
用于查询DNS服务器;
用于验证客户端的设置;
用于下载DNS数据库;

#;nslookup;
Default;Server:;;ns.zjhzptt.net.cn;
Address:;;202.96.96.68;

>;www.sun.com;
Server:;;ns.zjhzptt.net.cn;
Address:;;202.96.96.68;

Non-authoritative;answer:;
Name:;;;;www.sun.com;
Address:;;192.18.97.241;

>
启动时，nslookup缺省地以本地服务器为目标。响应中包括目标服务器的名字和地址。>是提示符，这意味着可以开始发送名字服务询问或配置。;

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