Internal DNS Best Practice - should a slave resolve internet domain names?

I have inherited a internal DNS solution at my new company and I want to start to improve its reliability! At the moment there is one Master for the internal domain which forwards external DNS lookups to our ISP. There is one slave which only seems to resolve internal requests.

For improved resiliency should I be setting the slave to forward internet lookups as well?

Thanks for any help.

Answer

Yes, slave should be the same as master in all regards, except that it has a reference to master to feed for any other changes. The purpose of a slave DNS is exactly to continue doing what master was doing until it failed.

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