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Anyway now the data arrive but when i send more messages at 30 ms frame rate the system crash. i send 660 Bytes every 25 ms. via serial port and all go fine. i think wouldn't be a problem send the same data via ethernet.
You can get some help and infos at pjrc.com teensy forums.
Because either Your code is faulty, or there is a problem with whatever shield You are using.