If you are using dhcp to assign your ip address, this can be (often is) configured to update your /etc/resolv.conf settings as well as provide your ip address.
I am not sure what Mandrake uses for dhcp configurations, but it is probably "pump". Look at the pump man page for details, but the -d command line option turns off the auto update of /resolv.conf. The default config file for pump is /etc/pump.conf.
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