Howtoforge posted a new guide: Resolving Domains Internally And Externally With Bind9 And Caching Nameserver

Sometimes, we are required to resolve our internal domains on a local nameserver and external (internet) domains on our ISP's nameserver. There are different solutions to this problem, but in this tutorial, we are going to solve it through configuring a combination of caching-nameserver and BIND 9.

Resolving Domains Internally And Externally With Bind9 And Caching Nameserver