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IT25130: DATAPOWER DNS ROUND ROBIN ALGORITHM DOES NOT HONOR TCP BASED DNSRESPONSE

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • DataPower DNS Round Robin algorithm will not honor TCP based
    response from DNS server which will cause DNS response to fail
    on DataPower, hence DNS resolution fails.
    

Local fix

  • Use First Alive algorithm instead of Round Robin.
    

Problem summary

  • DataPower user who uses Round robin as the Load balancing
    algorithm in Configure DNS Settings might see DNS query
    failures.
    
    The following error message might be observed if multiple IP
    
    addresses replied in the DNS query response for Round
    robin DNS:
    Cannot resolve host name '(the Full-Qulified-Domain-Name)' after
    (number of) ms.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT25130

  • Reported component name

    DATAPOWER

  • Reported component ID

    DP1234567

  • Reported release

    720

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-05-22

  • Closed date

    2018-07-16

  • Last modified date

    2018-07-25

  • 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

  • R750 PSY

       UP

  • R751 PSY

       UP

  • R752 PSY

       UP

  • R760 PSY

       UP



Document information

More support for: IBM DataPower Gateways
General

Software version: 7.2

Reference #: IT25130

Modified date: 25 July 2018