TCP/IP Configuration and Management Manual

Configuration Reference
TCP/IP Configuration and Management Manual—427132-004
A-16
Domain Name Server Files
$ORIGIN
You can use the origin line to change the origin in a data file. The line starts in column
1 and is followed by a domain origin. Use this line to put more than one domain in a
data file. For example:
$ORIGIN kentcomm.com
SOA—Start Of Authority
The format of this record is:
name [ttl] addr-class SOA origin person-in-charge (
serial-number
refresh-time
retry-time
expire-time
minimum-time )
For example:
@ IN SOA pubs.kentcomm.com joe.pubs.kentcomm.com. (
1.1 ; Serial Number
3600 ; Refresh Time
300 ; Retry Time
3600000 ; Expire Time
3600 ) ; Minimum Time
The Start of Authority (SOA) record designates the start of a zone.
The name is the name of the zone.
The origin is the name of the host on which this data file resides.
The person-in-charge is the mailing address for the person responsible for the
domain name server.
The serial-number is the version number of this data file. This number must be
incremented whenever a change is made to the data. The domain name server cannot
handle numbers over 9999 after the decimal point.
The refresh-time indicates how often, in seconds, a secondary domain name
server is to check with the primary domain name server to see if an update is needed.
The retry-time indicates how long, in seconds, a secondary server is to retry after a
failure to check for a refresh.
The expire-time is the upper limit, in seconds, that a secondary domain name
server is to use the data before it expires because it did not get a refresh.
The minimum-time is the default number of seconds to be used for the time-to-live
field on resource records. Each zone should have only one SOA record. The data that
follows a semicolon is ignored and treated as comments. The maximum value between
the time-to-live in the RR and the MINIMUM in SOA is sent in the response.