I used several times z00dax's howto to remotely setup CentOS 4 on already installed Linux boxes (see http://www.karan.org/blog/index.php/2005/06/15 ) but if you want to test the same thing with CentOS 5 you'll have to add a new paramater : noipv6 . Otherwise anaconda will try to ask if you want an ipv6 address (the same behaviour that you'll have in manual setup)