The caching-nameserver package includes the configuration files which will make the ISC BIND named DNS name server act as a simple caching nameserver. A caching nameserver is a DNS Resolver, as defined in RFC 1035, section 7. ISC BIND named(8) provides a very efficient, flexible and robust resolver as well as a server of authoritative DNS data - many users use this package along with BIND to implement their primary system DNS resolver service. If you would like to set up a caching name server, you'll need to install bind, bind-libs, and bind-utils along with this package.