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IZ40621: Functionality added to WebSphere MQ to avoid IPV6 lookups.

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APAR status

  • Closed as program error.

Error description

  • Functionality added to WebSphere MQ to avoid IPV6 lookup, by
    setting an AMQ_NO_IPV6 environment variable.
    
    This capability was added due to a user situation where a
    connection delay of some 20 seconds was occasionally being
    encountered. This was tracked down to the two IPV6 lookups that
    MQ may perform for a connection, and the system was timing-out
    after 10s when attempting an IPV6 lookup. But the user only
    needed IPV4 lookup.
    
    Keyword: MQCONN
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users with system configuration issues for IPV6 lookups, when
    it is known that WebSphere MQ only needs to perform IPV4
    lookups.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    WebSphere MQ had no configurability to avoid performing IPV6
    lookups. Whilst that should not normally be a problem, there
    may be user situations where it is desirable to inhibit these
    lookups.
    

Problem conclusion

  • Introduced the AMQ_NO_IPV6 environment variable, which when set
    so that MQ channel programs can see it, will prevent IPV6
    lookups from being performed. This should only be set if there
    are definite system issues with performing IPV6 lookups, and it
    is known that the queue manager will not be called upon to
    process IPV6 addresses.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v6.0
    Platform           Fix Pack 6.0.2.7
    --------           --------------------
    Windows            U200312
    AIX                U821719
    HP-UX (PA-RISC)    U821511
    HP-UX (Itanium)    U822328
    Solaris (SPARC)    U821514
    Solaris (x86-64)   U822359
    iSeries            SI35511
    Linux (x86)        U822325
    Linux (x86-64)     U822358
    Linux (zSeries)    U822329
    Linux (Power)      U822327
    Linux (s390x)      U822357
    
                       v7.0
    Platform           Fix Pack 7.0.0.2
    --------           --------------------
    Windows            U200302
    AIX                U822354
    HP-UX (PA-RISC)    U822349
    HP-UX (Itanium)    U822351
    Solaris (SPARC)    U822353
    Solaris (x86-64)   U822394
    iSeries            SI34790
    Linux (x86)        U822348
    Linux (x86-64)     U822393
    Linux (zSeries)    U822352
    Linux (Power)      U822350
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available, information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ40621

  • Reported component name

    WMQ LIN X86 V6

  • Reported component ID

    5724H7204

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2008-12-22

  • Closed date

    2009-01-14

  • Last modified date

    2011-01-25

  • 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

    WMQ LIN X86 V6

  • Fixed component ID

    5724H7204

Applicable component levels

  • R600 PSY

       UP

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Document Information

Modified date:
25 January 2011