/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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