BIND9 Unable to resolve the extranet address

1, today did an intranet DNS, mainly to resolve the intranet domain name and cache service, installed is the Ubuntu version, the default installation, in the choice of software, the choice of BIND9 and OpenSSH services, set the intranet domain name resolution and cache configuration, the results can only resolve the intranet address, can not parse the network, Look at the Ubuntu official website, said to set two cache DNS can be, the result is not, the internet looked up and said to set

Allow-query-cache {any;};

The setup is complete and the results are successful. Outside the network can be resolved, this lesson tells me not to trust the official website too.

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BIND9 Unable to resolve the extranet address