Since going community, MDK10.1 have not updated their install/images/network.img (or wherever the ftp settings are stored), and this will cause problems when doing a network installation. You should do a ftp to your preferred source to check the directory stucture (on my preferred server ./pub/linux/mandrakelinux/official/i586 etc.)
I've been annoyed with the continous changes in the directory structure which has taken place since MDK9.2 - it have caused nothing but problems for me (have a memebership (torrent->CD), but do most installs outside of it - directly from ftp server).
If the creators could settle for a ftp structure that is recognizable, once and for all future, I would be most happy. At least you should update the network images to reflect what is current.