I have just been through this though on redhat 7.2.
how i did it (hope mandrake gnome options are similar to redhat).
click on Start ->then Program->System->Network Configuration (this can also be executed typing "neat" on shell prompt, u need to be root.)
go through all tabs "Hardware", "Devices", "Hosts", "DNS".
get all network information (like default gateway, DNS servers, IP address, domain name from windows prior to booting from linux.)
there are some other threads which helped me go through this (all of them related to redhat, but still be helpful to you too).
like "Redhat 7.2 doesn recognize my nic card" and few others in case your OS is not able to recognize card.
HTH
-Abi
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