pppoe[xxx]: Bad TCP checksum fbff

Hi there,
I've xDsl connection with Linux Redhat 9.0A and it works quite fine. But I
look in my /var/log/messages file, I often find the following error:
<date> <time> <MySystemName> pppoe[1006]: Bad TCP checksum fbff

Anyone suggesting me how does it involve or if it's a problem?

Tnx in adv
Gabolander

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