User manual

Appendix D
158
Name server (NS)
The primary name server defaults to the host name of the RaQ 3. You
can specify the qualified host name of the secondary DNS server for that
domain in the Secondary Name Server (NS) host name field. Some
top-level domain registration organizations require that the secondary
name server record be defined.
Domain administrator email address
The email address defaults to the user name “admin” of the RaQ 3. This
email address is publicly available and is the administrative contact for
the domain or network served.
Refresh interval
You can configure the refresh interval between updates from a
secondary DNS server.
• If DNS record changes occur infrequently, increase the default
value.
• If DNS record changes occur often, decrease the default value.
Tune the refresh interval to avoid wasting bandwidth and to ensure the
content on the secondary server is accurate at all times.
Retry interval
Due to a connection or service failure, a secondary DNS server may be
unable to refresh data from the primary server. The secondary DNS
server attempts to refresh data after the interval specified for trying
again.
Expire interval
A secondary DNS server may be unable to refresh data from the primary
server for a prolonged period of time. After the interval specified for
expiry, the secondary server stops serving name requests.
Time-to-live period (TTL)
A caching DNS server other than the primary and secondary DNS
servers for this domain or network can cache record lookups for the
TTL period. During the TTL period, a caching DNS server does not poll
the primary or secondary DNS servers for repeated lookups of the same
record.