IT10628: WHEN USING FIRST ALIVE DNS ON DATAPOWER, SOME DNS RESPONSES MAY BE INCORRECTLY IGNORED

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

APAR status

• Closed as program error.

Error description

• When the Algorithm First-Alive on a DNS server is configured
  and the DNS server responds to a query with an additional RR
  (resource record) DataPower may disregard the Answer record
  response
  

Local fix

• Consider a different load balance algorithm or configure the
  DNS server to no longer respond with additional RR.
  

Problem summary

• Affected is DataPower use of DNS in configurations using DNS
  name resolution, with DNS using first-alive algorithm.
  
  
  When DataPower obtains a DNS response containing a zero-length
  response record, it will fail to parse the response, failing the
  corresponding hostname resolution. An example of such DNS
  responses are ones containing an empty EDNS0 extension record.
  

Problem conclusion

• Fix is available in 6.0.0.17 and 6.0.1.13
  
  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