Problems with network inferaces on boot

Hi

My server went through a reboot lastnight and once it came back on line it created two new interfaces of eth1 called eth1:1:1 and eth1:1:2

if it type 'ifconfig eth1:1:1 down' it removes both of them until the next reboot.

Is there a way to stop this completely? there are no config scripts under /sysconfig i can see of that i causing this.

Thanks