1.转发DNS，缓存DNS，这两种类型功能很相近，转发DNS有缓存，缓存DNS有转发，在named.conf文件中配置

options {

listen-on port 53 { any; };

listen-on-v6 port 53 { ::1; };

directory"/var/named";

dump-file"/var/named/data/cache_dump.db";

statistics-file "/var/named/data/named_stats.txt";

memstatistics-file "/var/named/data/named_mem_stats.txt";

// Those options should be used carefully because they disable port

// randomization

// query-sourceport 53;

// query-source-v6 port 53;

forwarders { 192.168.8.201; };//向上级DNS查询的地址

forward only;//仅转发，如果对方没有就不再查询

//forward first;//先转发查询，如果查询不到就向根查询

allow-query{ any; };//允许查询的ACL

allow-query-cache { any; };//允许查询缓存的ACL

};