[CentOS] question on alias IPs using ifcfg-eth0:x

When using ifcfg-eth0:x files in /etc/sysconfig/network-scripts/, should each file (where x increments appropriately) point to DEVICE=eth0:x or DEVICE=eth0:0?

I apparently have my alias files all ifcfg-eth0:0 - ifcfg-eth0:7 show DEVICE=eth0:0. Is this right? It seems odd to me and while it does seem odd, the alias IPs are being appropriately responded to, answering pings and nameserver requests.

The output of /sbin/ifconfig is what clued me in to the fact that I may well have done this wrong. This output showed eth0 and eth0:0 only.

Suggestions are welcome and much appreciated.

Thanks, ~Ray

CentOS release 5 (Final) 13:28:59 up 40 days, 1:58, 1 user, load average: 0.00, 0.03, 0.00 kernel: 2.6.18-8.el5