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IMC sending icmp using fake source IP address

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  • 1.  IMC sending icmp using fake source IP address

    Posted Jul 21, 2022 02:57 AM

    Hi

    I've noticed in our FW drop logs icmp requests from our IMC using source IP addresses randomly selected from subnets where IMC manages one or more hosts. These source IP addresses are not configured in IMC anywhare.

    Any suggestions what would be causing this behavior?

    We run 7.3(E0705P10)


    Cheers

    Timo Krjukoff



  • 2.  RE: IMC sending icmp using fake source IP address

    EMPLOYEE
    Posted Jul 21, 2022 04:46 AM
    Hello Timo,

    If you do not want this you should wswitch of the features DismanPinf and ForgedPing, which are helping build  better topologies.

    You can do that under System-System settings in Web Gui.

    Here is also the description of those:

    1. Enable DismanPing: The DismanPing test enables devices to maintain the latest MAC address table entries of neighboring devices by periodically broadcasting DismanPing packets, and allows the system to precisely draw the Layer 2 topology.
    2. Enable Forged Ping Packets: For a device where DismanPing is not enabled, this feature periodically sends forged ping packets to the device to trigger the device to send broadcast ARP messages. This feature solves the problem that some device links are lost within a period of time because MAC address entries age out. This feature improves the accuracy of the links drawn based on MAC address learning. By default, this feature is enabled.


    Regards,

    ------------------------------
    Marina
    HPE
    Sofia
    ------------------------------

    Original Message


  • 3.  RE: IMC sending icmp using fake source IP address

    Posted Jul 21, 2022 06:46 AM

    Hi Marina

    Thanks for your quick reply. None of those features are explained in the Admin Guide for IMC PLAT 7.3 (E0705).

    Cheers

    /timo


    Original Message