One more thing to mention is I used my Knoppix CD in friends Note PC, whose internet line is
same with me and IP addresses are 172.19.* . The net works fine.

My notebook has modem inside (Smart Link 56k voice modem).
And when I investigate network adapters in MS Windows control panel,
there are 2 adapters named "1394 net adapter" and "ULi PCI Fast Ethernet Controller".
I don't know which one is used for internet.
Is it possible there is some conflicts between those hardwares?

Thanks in advance.

Bataa