Run Separate DNS Servers for External and Internal Queries

Description

Is it possible to run external and internal nameservers on separate systems? If so, follow the configuration guidance in this section. On the external nameserver, edit /etc/named.conf to add or correct the following directives:

options {
  allow-query { any; };
  recursion no;
  ...
};
zone "example.com " IN {
  ...
};

On the internal nameserver, edit /etc/named.conf. Add or correct the following directives, where SUBNET is the numerical IP representation of your organization in the form xxx.xxx.xxx.xxx/xx:

acl internal {
  SUBNET ;
  localhost;
};
options {
  allow-query { internal; };
  ...
};
zone "internal.example.com " IN {
  ...
};