it seems that your VPS is an OpenVZ container configured with a venet interface, so these settings are ok (only the openvz admin can assign IPs).
But note that a VPS is probably not the best base for an ISPConfig installation. Because of the container environment, you don't have access to several system parts, e.g. you will not be able to configure fstab and quota (I don't how this affects ispconfig, because ispconfig adds mounts for the log files, so this might not work, either).
Plus, as far as I can remember, some services might not fully work with a venet device.
Last edited by stefanm; 29th September 2013 at 22:05.