TCP/IP Information
Copyright © 1997 by International Business Machines Corporation

DDNS Server Administrator Help

Domain Options Tab

Use the Domain Options tab of the Primary Domain Notebook to control automatic reverse mappings for static hosts, to specify secondary name server refresh parameters, and to set the default cache time.

The Domain Options tab has these fields and check boxes:

Automatically create reverse mappings for statically defined hosts in this domain
When checked, indicates that a pointer (PTR) resource record is to be created for any host added to this domain using the DDNS Server Administrator program. A PTR resource record, which provides IP address-to-host name mapping, stores data for the in-addr.arpa domain. If an in-addr.arpa domain does not exist for the domain, it will be created when a host is added. When a statically defined host is removed, its reverse mapping is deleted.

Current serial number for domain data
Identifies the current revision level of the data. The serial number is stored in the SOA (Start of Authority) resource record for this domain.

Secondary server refresh
Specifies the parameters for refreshing secondary name servers.

Note:

These refresh parameters provide an alternate method of notifying the secondary servers. If you are defining notify servers on the Notify Servers tab, these parameters can provide a backup method for notifying the secondary servers.

Secondary name servers should try to refresh their data every n seconds
Specifies the interval, in seconds, at which secondary servers should contact the master server to see if their data needs to be refreshed (if the serial number changed).

If the refresh fails, secondary name servers should continually retry every n seconds
Specifies the length of time, in seconds, that a secondary server for this domain should wait before retrying a failed refresh.

If unable to refresh for n seconds, expire information about this domain
Specifies the length of time, in seconds, that a secondary server should consider its data valid if it cannot contact the master server. If no contact with the master server occurs prior to the expiration time, the secondary server will consider its data stale and will no longer respond to queries for this domain.

Default cache time (TTL) for this domain on caching servers
Specifies the maximum amount of time that data for this domain is to be cached by a caching server. This value is used for any type of resource record for which an explicit time-to-live (TTL) value has not been specified elsewhere, such as in the Host Notebook. This value is stored in the Start-of-Authority (SOA) resource record.

These push buttons are available on the Domain Options tab:

OK
Retains the configuration data in this notebook and closes the notebook.
Cancel
Cancels any actions taken in this notebook and closes the notebook.
Help
Displays information about the current notebook page.


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