TCP/IP Configuration and Management Manual

Configuration Reference
TCP/IP Configuration and Management Manual—427132-004
A-15
Domain Name Server Files
The third field addr-class is the address class. There are currently two address
classes: IN for Internet addresses and ANY for all address classes.
The fourth field record-type states the type of the resource record.
The record-specific fields record-specific-data are dependent on the type of the
resource record.
All comparisons and lookups in the domain name server database are case
insensitive.
The following characters have special meanings:
Most resource records have the current origin appended to names if they are not
terminated by a period (.). This feature is useful for appending the current domain
name to the data, such as machine names, but may cause problems where you do not
want this to happen. If the name is not in the domain for which you are creating the
data file, a good rule of thumb is to end the name with a period (.).
$INCLUDE
An include line begins with $INCLUDE, starting in column 1, and is followed by a file
name. This feature is particularly useful for separating different types of data into
multiple files. For example:
$INCLUDE $SYSTEM.ZTCPIP.MBOX
The line is interpreted as a request to load the file $SYSTEM.ZTCPIP.MBOX. The
$INCLUDE command does not cause data to be loaded into a different zone or tree.
The command allows data for a given zone to be organized in separate files. For
example, mailbox data might be kept separately from host data using this mechanism.
. A free-standing dot in the name field refers to the current domain.
@ A free-standing @ (at-sign) in the name field denotes the current origin.
.. Two free-standing dots represent the null domain name of the root when
used in the name field.
\X A backslash preceding the character X, which can be any character other
than a digit (0- 9), prevents its special meaning from being applied. For
example, “\”. can be used to place a dot character in a label.
\DDD A backslash preceding the decimal number described by DDD, where each D
is a digit, is the octet corresponding to the number. The resulting octet is
assumed to be text and is not checked for special meaning.
( ) Parentheses group data that crosses a line. In effect, line terminations are
not recognized within parentheses.
; A semicolon starts a comment; the remainder of the line is ignored.
* An asterisk signifies a wildcard.