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Ethernet Frame Check Sequence Incorrect

kim jung hyun
Prodigy 110 points

My configuration is CCS v4.2.4.00033, NDK v2.20.00.19

I compiled program using NDK example and captured TCP packets by WireShark

I found out above FCS error.

I want to know 2 things.

1. Is this FCS error a fatal problem ?

2. If this FCS error is a fatal problem, How can I solve this problem?

I am a novice, so, I need help a lot form experts. Thank you !!

  • 0
    TI__Mastermind 43955 points

    Hi Kim Jung,

    Moving your post to BIOS forum as the query is about NDK example.

     

    Regards,

    Shankari

  • 0 in reply to Shankari G
    TI__Mastermind 26780 points

    I’m not an expert by any means… but I think the bad FCS would only be a problem if you were using a protocol where the discarded packets were not detected and resent.  You’re using TCP, so the dropped packets should be retransmitted.

  • 0 in reply to ScottG
    Prodigy 110 points

    Thanks for your reply

    I used code according to NDK example and send , recv functions.

    so I want to know why this FCS incorrect message is happend and if it is normal or not.

    If it is a problem, how can I do?

  • 0 in reply to kim jung hyun
    TI__Mastermind 26780 points

    After a bit of Googling, there are many reasons that FCS errors can occur.  I saw references that they could be caused by transmission collisions, bad cables, faulty switch ports, ½ vs full duplex mismatches, other switch configuration settings, etc.  Also, mentions that for ½-duplex environments that a one percent ratio of data link errors to total traffic is acceptable, and typically only when it reaches 2 or 3 percent does degradation become noticeable.  I don’t know what the cause is within your environment, but in general I think FCS are expected to occur occasionally.

  • 0 in reply to ScottG
    Genius 3720 points

    Hi Kim

    Did you find a solution for this problem?

    I am also seeing 'Frame Check Sequence' set to zero in TCP packets sent by NDK.  I think the 'verified answer' for this thread may be incorrect.  You are not just seeing FCS errors, you are seeing the FCS set to zero.

    Best regards

    David