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IBM i5/OS Intrusion Detection System

An IBM Redpaper publication

Note: This is publication is now archived. For reference only.


Published on 08 January 2007

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IBM Form #: REDP-4226-00

Authors: Yessong Johng, Jim Coon and Craig Jaquez

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    The Intrusion Detection System (IDS), introduced in IBM i5/OS, is a system that notifies you of attempts to hack into, disrupt, or deny service to the system. Prior to IDS, the i5/OS took some protective measures against the types of intrusions described here. However, with the new IDS support, the i5/OS system can now tell you about the intrusions.

    This IBM Redpaper describes the following types of intrusions on the i5/OS system that are caught, audited, and, in many cases, discarded—before they become a threat:


    - IP fragments

    - Malformed packets

    - SYN floods

    - Internet Control Message Protocol (ICMP) redirect messages

    - Perpetual echo

    - Restricted IP options

    - Restricted IP protocols


    Traffic regulation anomalies for TCP and UDP

    Table of Contents

    Intrusion types

    Setup for IDS notification on i5/OS

    IDS policy file

    Intrusion Monitor (IM) entries

    Verifying IDS policy implementation


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