A default domain may be specified for the name server using a line such as
domain Berkeley.Edu
Older name servers use this information when they receive a query for a name without a ``.'' that is not known. Newer designs assume that the resolver library will append its own idea of a ``default domain'' to any unqualified names. Though the name server can still be compiled with support for the domain directive in the boot file, the default is to leave it out and we strenuously recommend against its use. If you use this feature, clients outside your local domain which send you requests about unqualified names will have the implicit qualification of your domain rather than theirs. The proper place for this function is on the client, in their /etc/resolv.conf (or equivalent) file. Use of the domain directive in your boot file is strongly discouraged.