Copyright (C) 1997, 1998 by International Business Machines Corporation
DDNS Server Administrator Help
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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