Ubuntu 12.10 DNS 配置
首先不推荐修改/etc/resolv.conf或者修改/etc/resolvconf/resolv.conf.d/目录下的head，base文件，添加tail文件的方法也不赞成。
因为resolv.conf和head文件中都有提醒文字：
nslookup google.comServer:10.112.18.1Address:10.112.18.1#53Non-authoritative answer:Name:google.comAddress: 74.125.224.229Name:google.comAddress: 74.125.224.224Name:google.comAddress: 74.125.224.238Name:google.comAddress: 74.125.224.230Name:google.comAddress: 74.125.224.232Name:google.comAddress: 74.125.224.227Name:google.comAddress: 74.125.224.233Name:google.comAddress: 74.125.224.231Name:google.comAddress: 74.125.224.225Name:google.comAddress: 74.125.224.226Name:google.comAddress: 74.125.224.228
