Fixes are available
Fix packs for DataPower XML Security Gateway version 6.0
Fix packs for DataPower B2B Appliance version 6.0
Fix packs for DataPower Integration Appliance version 6.0
Fix packs for DataPower Low Latency Appliance version 6.0
Fix packs for DataPower Service Gateway version 6.0
Fix packs for DataPower Service Gateway version 6.0.1
Fix packs for DataPower B2B Appliance version 6.0.1
Fix packs for DataPower Integration Appliance version 6.0.1
APAR status
Closed as program error.
Error description
If the Load Balancing Algorithm in the DNS Settings is set to Round Robin, the TTL (time to live) setting might not be honored. The DNS resolution caches for lifetime.
Local fix
In the WebGUI, go to Network > Interface > DNS Settings and change the Load Balancing Algorithm from Round Robin, which is the default value, to First Alive.
Problem summary
Affected are all DataPower appliances that query DNS servers and obtain responses to AAAA query with OK response code, but no address records. This includes appliances with no IPv6 networking configured. Only configurations using DNS with round-robin algorithm are affected. The appliance always sends out both A and AAAA DNS queries for every DNS name it does not hold in its cache. Depending on the mutual timing of the DNS responses to these queries, a DNS cache entry with invalid TTL value may be created. That invalid TTL may be long or virtually infinite.
Problem conclusion
Fix is available in 5.0.0.12, 6.0.0.4 and 6.0.1.0. For a list of the latest fix packs available, please see: http://www-01.ibm.com/support/docview.wss?uid=swg21237631
Temporary fix
Comments
APAR Information
APAR number
IC97354
Reported component name
DTPWR INTGRAPL
Reported component ID
DP905XI52
Reported release
500
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-10-31
Closed date
2013-12-18
Last modified date
2014-01-22
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
DTPWR INTGRAPL
Fixed component ID
DP905XI52
Applicable component levels
R500 PSN
UP
R600 PSN
UP
R601 PSN
UP
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Document Information
Modified date:
22 September 2021