ppp problem

[andrea]

I conect to the internet via ppp with kppp. I' have no problem getting 
connect, but I can't navigate if the ethernet port is on. Once I deactivate 
my ethernet port I can surf the web. As soon as I switch it on, Mozilla can't 
resolve any address. I understand my computer try to access the web via the 
ethernet port (if on) and not with the active ppp connection. How can I solve 
this ?

thanks for help,

Andrea

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Apple G4 Cube 450 runnig YDL 3.0