注：已经提供了免费的DNS解析服务。并且VERYCD已经在使用了。地址：http://www.dnspod.com
/*
* 架构根据电信、网通用户自动解析不同IP的DNS服务器
* 本文介绍了如何让DNS服务器根据用户的IP地址解析出不同的镜像服务器IP
* 版本: 1.1.0
* 作者: 声仔(奶罩)
* 网站: http://wuhongsheng.com
* 版权: (C) 1999-2006 wuhongsheng.com
* 修订: 2006-01-19 23:13
* 原始出处: http://wuhongsheng.com/blog/?p=235
*/
本文档基于FreeBSD、BIND平台，Win用户请回避，没有FreeBSD基础的用户请回避。Linux或者其他Unix用户可以作为参考文档。
修订记录：
2006-01-19 修订了部分网通用户的IP地址，修正了NS部分，修正了一些错误，增加了常见问题。
配置步骤：
1. 前言
2. 软件列表
3. 安装BIND 9
4. 配置BIND 9
5. 测试BIND 9
6. 添加一个NS地址
7. 添加一个域名
8. 测试域名
9. 常见问题
一、 前言
本文假设你有一定的FreeBSD操作经验，懂得日常的FreeBSD操作，有良好的耐心，可以
把文档看完，可以处理突发的问题。
本文再假设你已经有了一个域名，并且已经指向所操作的服务器，服务器的/etc/rc.conf
已经正确的设置此域名。在本文里面，此域名为ns.naizhao.com，IP为219.132.1.1。
/etc/rc.conf如下所设置
hostname=”ns.naizhao.com” #机器的域名，请酌情修改
ifconfig_fxp0=”inet 219.132.1.1 netmask 255.255.255.0″ #此行可能有所不同，
请别照抄。fxp0为我机器上面的网卡。
二、 软件列表
本文所用到的软件可从以下地址获取。连接地址最后更新为2005/12/12
BIND 9.3.1
ftp://ftp.isc.org/isc/bind9/9.3.1/bind-9.3.1.tar.gz
三、 安装BIND 9
我们假设你已经把BIND 9使用fetch或者wget到/root/下，并且已经su为root。
# tar zxvf bind-9.3.1.tar.gz
# cd bind-9.3.1
# ./configure
# make
# make install
# make clean
到此，BIND 9已经安装上了。如果安装过程中出现什么问题，一般不会是你的人品有问题，
请分析错误信息，把缺少的包给安装上。
四、 配置BIND 9
先别急，看看你的BIND版本再说。
# named -v
如果你是FreeBSD 4，估计你看到的提示类似下面的
named 8.3.7-REL Sun Dec 12 04:15:36 CST 2004
如果你是FreeBSD 5，估计你不会看到上面的信息。然后我们再来输入
# /usr/local/sbin/named -v
这次，不管你是FreeBSD 4还是FreeBSD 5，都会看到下面的信息
BIND 9.3.1
所以在这里，我们统一使用/usr/local/sbin/named
废话少说，开始配置吧。
# cd /etc/namedb
# chmod +x make-localhost
# ./make-localhost
会在当前目录生成一个localhost.rev和localhost-v6.rev。后者是用于IPv6
生成rndc的key
# /usr/local/sbin/rndc-confgen >rndc.conf
打开rndc.conf，把
# Use with the following in named.conf, adjusting the allow list as needed:
……
# End of named.conf
之间的内容，去掉注释#，添加到named.conf中
编辑named.conf
# ee named.conf
找到
zone “.” {
type hint;
file “named.root”;
};
zone “0.0.127.IN-ADDR.ARPA” {
type master;
file “localhost.rev”;
};
// RFC 3152
zone “1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA” {
type master;
file “localhost-v6.rev”;
};
// RFC 1886 — deprecated
zone “1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.INT” {
type master;
file “localhost-v6.rev”;
};
把上面的内容全部用/**/注释
/*
zone “.” {
type hint;
……
file “localhost-v6.rev”;
};
*/
在named.conf文件的最后，把刚才rndc.conf里面的内容添加进去
key “rndc-key” {
algorithm hmac-md5;
secret “ILzfx8ONk2444ix9jnDfKA==”;
};
controls {
inet 127.0.0.1 port 953
allow { 127.0.0.1; } keys { “rndc-key”; };
};
（上面的内容只供参考）
接下来的，就是文章里面的重头戏了。
其实bind的配置远不需要这么复杂，里面的很多东西都是没必要的，例如对localhost的解析以及IP地址反解析等等
[Comment ID #24324 Will Be Quoted Here]
bind的确有些臃肿，djbdns和tinydns都挺好使的。
功能不难实现，难的是如何动态，实时更新IP表。
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