Well, unfortunately I don't know mandrake.
Here's a CLI alternative in case your network scripts look anything like SuSE's.
First back up the dhcp file in case you mangle it:
Code:
cp /etc/sysconfig/network/dhcp /etc/sysconfig/network/dhcp.backup
Next find the line in /etc/sysconfig/network/dhcp that looks like
Code:
DHCLIENT_MODIFY_RESOLV_CONF="yes"
and change it to
Code:
DHCLIENT_MODIFY_RESOLV_CONF="no"
Finally, restart your network service. Should be something like
Code:
/etc/init.d/network restart
After this I think you should be able to happily edit your /etc/resolv.conf without it getting overwritten.
Good luck.