here are a few SLES11SP4 systems. They run as a semi closed test structure.
Semi closed as far as they has no records in the DNS. The systems use the
/etc/hosts to resolve hostnames / FQDN in IP-Addresses.

It is possible to ping from one of theses test systems to another host of
these structure, even I can use telnet to connect a service (e.g.
postgresql) at another of these hosts.

But nslookup and dig asks only the DNS-Server and do not read the
/etc/hosts. As far as I remember in the early years there was a possibility
to overwrite the DNS with local entries in the /etc/hosts?!

How I can archieve this on SLES11SP4?