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IT16190: DATAPOWER SELF BALANCING INCORRECTLY DOES NOT DECREMENT IP TTL UPON PACKET FORWARDING

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APAR status

  • Closed as program error.

Error description

  • DataPower Self Balancing incorrectly does not decrement IP TTL
    upon
    packet forwarding. If two self balancing group members cannot
    communicate via multicast but they can successfully forward
    packets to each other, this can lead to a packet forwarding
    loop.
    

Local fix

Problem summary

  • Affected are all DataPower configurations using AO feature with
    self-balancing.
    
    The packets forwarded by the master to other members of a
    self-balancing group do not have the TTL field in IP header
    decremented. This is in violation of IP protocol. In
    pathological corner cases, like a temporarily degraded
    self-balancing group with two masters, this can cause packet
    forwarding loop and local network congestion.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT16190

  • Reported component name

    DATAPOWER

  • Reported component ID

    DP1234567

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-07-27

  • Closed date

    2016-09-13

  • Last modified date

    2016-09-27

  • 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

  • R720 PSN

       UP

  • R750 PSN

       UP

  • R751 PSN

       UP

  • R752 PSN

       UP



Document information

More support for: IBM DataPower Gateways
General

Software version: 7.1

Reference #: IT16190

Modified date: 27 September 2016