DNS Configuration and Management Manual (G06.27+, H06.05+, J06.03+)

DNS Server Configuration
HP DNS Configuration and Management Manual—529432-003
B-9
The db.127.0.0 File
The NS record designates a name server for the current origin (0.0.127.in-
addr.arpa).
PTR records are usually associate an address in the
in-addr.arpa domain with
the canonical name of a host. The PTR record in the example
db.127.0.0 file
associates the name localhost with the address
1, that is, 1.0.0.127.in-
addr.arpa. (The current origin 0.0.127.in-addr.arpa is appended to the 1
in the name field because it does not end with a dot.)
data
For an SOA record, data includes the name of the host this data file was created
on, the mailing address of the person responsible for the name server, and the
following values:
Serial
indicates the version number of this file, incremented whenever you change
the data.
Refresh
indicates (in seconds) how often a slave name server must update its data
from a master server.
Retry
indicates (in seconds) how often a slave server must retry after an attempted
refresh fails.
Expire
indicates (in seconds) how long the slave name server can use the data before
the data expires for lack of a refresh.
Minimum ttl
indicates (in seconds) the minimum number of seconds the name server is
allowed to cache data. After the time-to-live (ttl) value expires, the name server
must discard the cached data and obtain new data from the authoritative name
servers.
The
NS data is the fully qualified name of the name server.
The
PTR data is the loopback address of localhost, in the in-addr.arpa
domain.
$TTL
indicates (in seconds) the time-to-live (ttl) value for records that do not have the ttl
value defined in the data field.