Copyright (C) 1997, 1998 by International Business Machines Corporation
DDNS Server Administrator Help
Use the Dynamic Options Notebook to customize your dynamic
domain.
The Dynamic Options Notebook is displayed when you click the Dynamic
Options push button on the Domain Configuration tab of the
Primary Domain Notebook.
The Dynamic Options Notebook has these fields and check boxes:
- Security Mode
- Specifies whether this domain is in secured or presecured mode. In
either mode, IBM DDNS servers use RSA public key digital signatures to
authenticate DDNS update requests.
- Client automatically creates its own host name
- Sets secured mode, in which a DDNS server allows any host that complies
with the DDNS protocol to register and update its host name.
- Only system administrator can create client's host name
- Sets presecured mode, in which a system administrator must preregister
host names before hosts can dynamically update their records. To
generate keys, click the Generate Keys for Host push button.
- Include key and signature information when transferring data to secondary
name servers
- When checked, indicates that KEY and SIG records, which are used only in
dynamic domains, are to be transferred to the secondary name servers for the
domain.
- Save copy of data before each update
- When checked, indicates that the DDNS server is to create a backup copy of
its dynamic domain data file before each update. All changes except
those associated with the most recent update are backed up. If you have
chosen to separate the static and dynamic data, only the dynamic data is
backed up.
- Delete SIG records for expired host names
- When checked, specifies that a host's SIG records are to be removed
when its name (KEY resource record) expires. For secured domains, all
SIG records for the host will be deleted. For presecured domains, all
SIG records corresponding to a host's resource records, except for the
SIG KEY resource record, will be deleted. If not checked, SIG records
remain indefinitely.
Note:
A SIG record holds an RSA digital signature, which is included in a dynamic
update to the DDNS server. There is one SIG record for each type of
resource record. The DDNS server uses the SIG record along with a
host's KEY record to verify that the originator of an update message is
really the owner of a resource targeted by the update message.
- Delete every day at
- Specifies the hour, in 24-hour time, when the SIG records are to be
removed from the data base. The default is 2 am.
- Adjust for client and server clock differences in determining data
expiration times
- When checked, specifies client/server time synchronization, in which the
name server calculates an adjusted data expiration time based on the length of
time requested by a client rather than the absolute time specified by the
client. This option ensures the accuracy of the client-specified data
expiration time when client and server clock settings are not identical or
when clients and servers reside in different time zones.
- Forward adjusted expiration time when transferring data to secondary name
servers
- When checked, specifies that the adjusted data expiration time (calculated
by the name server) is to be forwarded to the secondary servers or to programs
that request it, such as NSLOOKUP, which displays the adjusted data expiration
time whenever a query is received for a host in this dynamic domain.
- Set a maximum time to cache dynamic data for this domain
- When checked, specifies that a maximum time for caching dynamic data on
caching servers is to override all cache times specified elsewhere, such as in
a client record. This option enables the administrator to reduce the
cache times for dynamically entered records.
Note:
The cache times specified elsewhere are not changed.
- Maximum time
- Specifies the maximum amount of time, in seconds, that the dynamic data
for this domain is to be cached on caching servers. If the value
specified here is greater than a value specified elsewhere, the other (lower)
value is used.
These push buttons are available in the Dynamic Options Notebook:
- Generate keys for hosts
- Displays the Generate Keys Window to enable you to
generate keys for hosts in a domain running in presecured mode.
- 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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