配置DNS转发器

原理：

本地dns不能解析了,请求外部的去解析,而第一台dns不能解析(便成了转发器),再请求其他dns解析,其他dns把结果发个转发器,转发器在发给本地dns

配置需要：

一台能够正常解析的dns服务器，ip地址为10.18.44.51   一台dns服务器当转发器，ip地址为10.18.44.120

开始配置：

正常能够解析的dns服务器10.18.44.51

#vim /etc/named.confoptions {        directory "/var/named";};zone "lala.com." IN {        type master;        file "lala.com.zone";};

#vim /var/named/lala.com.zone$TTL 86400@ IN SOA vm2.lala.com. root.lala.com (                100000000                1M                15M                1W                1D)                 IN NS vm2.lala.com.vm2         IN A 10.18.44.51 #systemctl restart named

转发器10.18.44.120

#vim /etc/named.confoption {        directory "/var/named";        recursion yes;        forward first;        forwarders { 10.18.44.51; };};zone "houzi.com." IN {    type master;    file "houzi.com.zone";    notify yes;}

#vim /var/named/houzi.com.zone$TTL 86400@ IN SOA vm1.houzi.com. root.houzi.com (                            100000000                            1M                            15M                            1W                            1D)                            IN NS vm1.houzi.com.    vm1     IN A 10.18.44.120

测试转发器：10.18.44.171

#vim /etc/resolv.confnameserver 10.18.44.120#ping www.houzinan.comPING www.houzinan.com (10.18.44.210) 56(84) bytes of data.64 bytes from 10.18.44.210 (10.18.44.210): icmp_seq=1 ttl=64 time=0.693 ms64 bytes from 10.18.44.210 (10.18.44.210): icmp_seq=2 ttl=64 time=0.645 ms#ping vm1.houzi.comPING vm1.houzi.com (10.18.44.120) 56(84) bytes of data.64 bytes from 10.18.44.120 (10.18.44.120): icmp_seq=1 ttl=64 time=0.208 ms64 bytes from 10.18.44.120 (10.18.44.120): icmp_seq=2 ttl=64 time=0.372 ms