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PING fails for larger packets of size 2500 bytes

  • Santosh Pinto
    Posted by
    on Apr 14 2012 02:04 AM
    Expert1010 points

    Im running the helloWorld example availble in the MCSDK 2.0 for the Advantech EVM c6670.

    The IP assigned is 192.168.2.100.

    I try to ping the Ethernet of the DSP c6670 EVM by giving the command as ping 192.168.2.100 -t and all works fine as i get the Ping replies as shown in the attached images.

    I try to ping the Ethernet of the DSP c6670 EVM by giving the command as ping 192.168.2.100 -t -l 2500 , <which means by sending 2500 bytes of ICMP

    packets>, and on observation i see that some ping replies are received and some are failed, due to IP refragmentation.

    Kindly let me know as to how can i resolve this issue and if any settings need to be made in the code.

     

    Regards

    Santosh

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  • Steven Connell
    Posted by
    on Apr 16 2012 21:13 PM
    Mastermind20600 points

    Santosh,

    I'm able to ping successfully on different hardware (OMAPL138).

    Which example are you using for this test?

    Can you try using the standard helloWorld NDK example?

    Steve

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  • Santosh Pinto
    Posted by
    on Apr 16 2012 23:52 PM
    Expert1010 points

    Hello Steven,

    Im using the helloWorld example found under :

    C:\Program Files\Texas Instruments\mcsdk_2_00_00_11\examples\ndk\helloWorld

    This was obtained after installing the MCSDK 2.0.11 version. This is the standard helloWorld application shipped with MCSDK examples.

    Im running the test on Advantech EVM c6670.

    Can you please try the same on this platform as well ? It would be great, or any of you there who have access to this platform.

    Regards

    Santosh

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  • ArunMani
    Posted by
    on Apr 23 2012 09:50 AM
    Genius9510 points

    Hi Santosh,

    Sorry for the delay. Let me try this. in the mean time, can you verify that the PC is not fragmenting the packet.

    Thanks,

    Arun.

    If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

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  • ArunMani
    Posted by
    on Apr 30 2012 20:03 PM
    Genius9510 points

    Hi Santosh,

    Did you verify that the packet is not fragmented?

    thanks,

    arun.

    If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

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  • Santosh Pinto
    Posted by
    on May 11 2012 03:20 AM
    Expert1010 points

    Well Arun, the Packets are fragmented and sent across the wire.

    I demonstrated the same test on a different laptop and it worked properly, seems there was some problem with the laptop that i was testing the ping test.

    Thanks... im facing another issue with NIMU driver of packets getting missed at the application layer. The issue is raised at

    http://e2e.ti.com/support/embedded/bios/f/355/p/162523/598985.aspx#598985

    Pls help me with that issue too.

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