Second ip address on same interface CentOS 6.3

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http://serverfault.com – I tried to add a second LAN addresses in CentOS 6.3 on a brand new install and it's not working. I installed a new copy of CentOS 5.7 and tried the same and it worked right away. Now I'm just trying to setup the alias on the same subnet and it's not working. what am i doing wrong, is this not possible on CentOS 6.3? second ip address on the same interface but on a different subnet CentOS 5.7 it works: DEVICE=eth0 BOOTPROTO=static BROADCAST= HWADDR=00:0C:29:01:6F:89 IPADDR= NETMASK= NETWORK= ONBOOT=yes DEVICE=eth0:0 BOOTPROTO=static BROADC ()