IT06889: APPLIANCE MIGHT IMMEDIATELY RESTART WHEN DNS USES TCP AND A REQUEST TIMES OUT

Fix packs for DataPower B2B Appliance version 6.0
Fix packs for DataPower Integration 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
Fix packs for DataPower Service Gateway version 7.0
Fix packs for DataPower B2B Appliance version 7.0
Fix packs for DataPower Integration Appliance version 7.0
Fix packs for DataPower Gateway version 7.1

APAR status

• Closed as program error.

Error description

• When a DNS query returns a response larger than a single UDP
  packet, TCP will be used for resolution instead.  If the request
  times out it is possible an unexpected immediate restart will
  occur.
  

Local fix

Problem summary

• Affected are DataPower installations using DNS with round-robin
  algorithm, connected to an incorrectly configured server.  When
  the DNS server response does not fit in DNS packet, DataPower
  DNS client retries the query via TCP as expected.  If that query
  times out for any reason, the appliance might restart,
  generating a backtrace.
  

Problem conclusion

• Fix is available in 6.0.0.14, 6.0.1.10, 7.0.0.7 and 7.1.0.5.
  
  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 is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DATAPOWER

• Fixed component ID

  DP1234567

Applicable component levels

• R600 PSN

     UP

• R601 PSN

     UP

• R700 PSN

     UP

• R710 PSN

     UP