eth0: UDP Checksum error
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  1. #1
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    eth0: UDP Checksum error

    I'm running a new 2.6.32.21-168.fc12.x86_64 installation (new box). Everything seems to be working ok, but my messages log is filling with:

    Code:
    Sep 27 19:56:28 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:56:54 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:57:19 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:57:45 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:58:10 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:58:36 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:59:02 localhost kernel: eth0: UDP Checksum error.
    Sep 27 19:59:27 localhost kernel: eth0: UDP Checksum error.
    What does this mean and how do I fix it? I'm hoping it's not a hardware problem because the NIC is on the mobo.

    ---------- Post added at 10:00 PM CDT ---------- Previous post was at 08:07 PM CDT ----------

    I finally got the error to go away by turning off received checksum offloading:

    ethtool -K eth0 rx off

    The NIC is a JMicron JMC260. So the bug appears to be related to the checksum offloading. Does this mean a driver bug or a NIC problem? This is a new box so if I need to return it I should do so quickly...

    thanks!

  2. #2
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    Re: eth0: UDP Checksum error

    I would definitely try another cable and another NIC if you have one. Could be a simple cabling problem.... ???

    SS

  3. #3
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    Re: eth0: UDP Checksum error

    The NIC is on the mobo so I can't change it. But if it's the nic/cable would would turning off checksum offload make the problem go away?

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