PTF Cover Letter
PTF ( Program Temporary Fixes ) Cover letter
TCPIP-OTHER-INCORROUT IDS ACKSTORM EVENT GENERATED BY TCP/IP
Pre/Co-Requisite PTF / Fix List
REQ LICENSED PTF/FIX LEVEL
TYPE PROGRAM REL NUMBER MIN/MAX OPTION
---- -------- --- ------- ------- ------
CO 5770999 710 MF49821 00/00 0000
NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels. This PTF may be a prerequisite
for future PTFs. By applying this PTF you authorize and agree to the
foregoing.
This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.
SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.
APAR Error Description / Circumvention
-----------------------------------------------
Intrusion Detection System Generates ACKSTORM Event Because of
TCP/IP Window Probes
CORRECTION FOR APAR MA40530 :
-----------------------------
A non-standard window probe was received and this caused TCP to
trigger its notification to IDS of a possible ACKSTORM. The test
for a possible ACKSTORM will be relaxed so that this type of
window probe, which is used by some systems, does not needlessly
trigger this event.
CIRCUMVENTION FOR APAR MA40530 :
--------------------------------
None.
Activation Instructions
None.
Special Instructions
None.
Default Instructions
THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.
Supersedes
PTF/FIX NO(S). APAR TITLE LINE
-------------- ------------------------------------------------------------
MF48598 LIC-COMM-TCPIP Transport Fixes
MF50394 LIC-COMM-TCPIP-UNPRED RETRANSMISSION TIMER HIGH
MF49877 LIC-COMM-TCPIP TCP Buffer Copy Prevention
Summary Information
System.............................. | i |
Models.............................. | |
Release............................. | V7R1M0 |
Licensed Program............... | 5770999 |
APAR Fixed.......................... | View details for APAR MA40530 |
Superseded by:...................... | View fix details for PTF MF99011 |
Recompile........................... | N |
Library............................. | QSYS |
MRI Feature ........................ | NONE |
Cum Level........................... | C1116710 |
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Modified date:
14 February 2011