I encountered problem in Knoppix 5.0.1, when trying to config pppoe. The script reports that the eh0 has a MTU of 64.

Here is my configration: eth0 (Intel Pro 10/100 network card) -> ADSL modem (prolink hurricane 9000/B) -> phone line.

After boot up, even before I start the pppoe script, I did a ifconfig and found that the eth0 is really configured with MTU 64. With this MTU of 64, I can not start pppoe properly. I have to do this before I can get the pppoe script to work:
1. ifconfig eth0 down
2. ifconfig eth0 mtu 1500
3. start the pppoe script with eth0 still in down state (otherwise the pppoe can not find the concentrator).

With the exactly the same hardware, I don't have this issue in knoppix 4.0.2.

Any clue why 5.0.1 configures my eth0 wrongly? How to fix it?

Thanks,

pubo