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If an AS/400 is a primary server to your DNS secondary server look for job
logs on the primary AS/400 that have QTOBXMIT listed under user data. The
QTOBXMIT job logs contain information about the transfer of zone information
from the primary server to the secondary server. Examine the timestamps of
the logs and correct the problems described.
3. Look at the DNS server active job log. Examine the job log entries and correct
any problems.
4. Verify that the primary server for this secondary server is up and running.
5. Verify that you have enabled the Save copies of master server data check box
for the secondary domain. The advantage of enabling this check box is that
the secondary server can function even if the primary server is down.
6. Verify the specified host name exists and is correct in the specified primary
domain.
7. Check the secondary refresh interval to see how often your secondary server
checks with the primary server to make sure its data is current. If you have
created the specified host name recently, verify that the system has updated
the secondary server with current information. Use the NSLOOKUP
(STRDNSQRY-Start DNS Query) to display the secondary refresh interval
defined by the primary server. Type the command:
NSLOOKUP
> set type=soa
> 'enter the fully qualified name of the primary domain
your DNS server uses to load its data'.
8. View the Active Server Database using Operations Navigator. Verify the
specified host name appears in the list of the information displayed.
9. Verify that your DNS server is actually receiving the given query. Refer to the
General tab listed under DNS Server Properties for information on how to
collect this information.
10. Use the DNS server debug feature to log DNS debug information for use by
service and product development.
Cause List D The IP to host name mapping information is found in the reverse
mapping primary domains. Use Cause List B and replace forward mapping primary
domain with reverse mapping primary domain and replace host name with IP
address in to help determine why a specified IP address can not be resolved to a
host name.
1. Verify that you have enabled the Create reverse mapping records for this host
check box for the specified host. You can find the check box on the Reverse
Mapping page of Host Properties for the specified host name. When this check
box is enabled the an entry will be created in the reverse mapping primary
domain.
2. Verify that you have enabled the Create and delete reverse mappings check
box for the forward mapping primary domain. You can find the check box on the
General page of Primary Domain Properties for the specified domain. When you
enable this check box, the system creates an entry in the reverse mapping
primary domain whenever you add a new host name to a forward mapping
primary domain.
Cause List E The IP to host name mapping information is found in the reverse
mapping primary domains. Use Cause List C and replace forward mapping primary
domain with reverse mapping primary domain and replace host name with IP
address to help determine why a specified IP address can not be resolved.
Cause List F
Chapter 21. TCP/IP Problem Analysis 485
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