eth0:3 keeps showing up.

[Dave Martini 1]

I have RHEL4 and should there always be an associated ifcfg-eth file in 
/etc/sysconfig/network-scripts for each device that
shows up when doing an ifconfig -a.
When I do ifconfig -a I see eth0:1 and eth0:3 but I don't have an 
associated eth0:3 file in /etc/sysconfig/network-scripts.
Does anyone know where it might be getting the eth0:3 from?
I have these machines  on a private as well as public network could it 
be getting the eth0:3 from one of the other hosts
on the private because the IP associated with eth0:3 belongs to one of 
my other servers on the private.

What's the proper command to delete eth0:3 for good?

/etc/sysconfig]#cd network-scripts/
[root at ct /etc/sysconfig/network-scripts]#ls
ifcfg-eth0    ifcfg-eth3      ifdown-ippp   ifdown-post  ifup          
ifup-ipsec  ifup-plip   ifup-routes    init.ipv6-global
ifcfg-eth0:1  ifcfg-lo        ifdown-ipsec  ifdown-ppp   ifup-aliases  
ifup-ipv6   ifup-plusb  ifup-sit       network-functions
ifcfg-eth1    ifdown          ifdown-ipv6   ifdown-sit   ifup-ib       
ifup-ipx    ifup-post   ifup-sl        network-functions-ipv6
ifcfg-eth2    ifdown-aliases  ifdown-isdn   ifdown-sl    ifup-ippp     
ifup-isdn   ifup-ppp    ifup-wireless  orig.ifcfg-eth3.02apr07