Network Monitor - TCP: Checksum = ERROR

Discussion in 'Server Networking' started by Guest, Jul 19, 2005.

  1. Guest

    Guest Guest

    getting the following errors on my server when i capture data using win2k
    built-in network monitoring tool...

    capture data, open captur log file, open packet, then scroll down and expand
    TCP tree in middle window pane..

    i then get the following errors....
    TCP: Checksum = ERROR: CheckSum is 0x6D8D, Should be 0xA6E1

    this appears on every tcp packet being sent...

    is this a bug/config problem withing network monitoring tool?

    thusfar i have this tool installed on 3 servers and getting the errors on
    all of them..

    running win2k with latest service packs.

    any ideas?

    thanks in advance.
    Guest, Jul 19, 2005
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  2. Guest

    A Schrader Guest

    Are you capturing on the computer sending the packets? If so, probably TCP
    Checksum Offload is enabled. You can check in your network connection

    Captures take their data from NDIS, which is before any offload checksum
    computations take place. You can also verify by running the capture program
    on another computer, filtering for packets sent from the original server.
    You should see correct packets in this case.
    A Schrader, Jul 21, 2005
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