When IP aliases are created in linuxconf it makes files in /etc/sysconfig/network-scripts, however these ifcfg files will not work. They have no device line and therefore will not bring the virtual interface up. Also, when a range of addresses is specified the range designation such as 192.168.0.1-25 is placed in the first virtual device file as the IP address. It would be nice if a selection could be made whether to start these interfaces on boot or not.
You can't bring a virtual interface up without the "real" interface it goes with. The next time eth0 is brought up (either at boot or manually), the virtual interfaces will come up.