LinuxQuestions.org - Problem withInternet, DHCP, connect with eth0 down work, connect with eth0 up not

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Problem withInternet, DHCP, connect with eth0 down work, connect with eth0 up not

I'm trying to set a little house network. So I've machine (server) with mandrake 9.1, I set up my internet connection to work normal ( Kppp). I have to set my DHCP server also.
I've configured 'sharing internet connection' (control center) and eth0 (DHCP,Gateway etc.), but
when I connect to internet with eth0 status up, my modem is connected, but I can't ping ip numbers... when I set eth0 status down and I redial I can ping ip and normaly work on internet...
Why??? Is it problem in dhcp.conf file or some other? I know that I'm soing something wrong but I don't know what. please help :(

Probably because you set the gateway to eth0. When the lan comes up it is switching to the default gateway. Remove the gateway and use ip maquerading.