multi eth0:x:y with ifconfig...

[Benoit Lathiere <b.lathiere@ism.asso.fr>]

I'm using the 'ifconfig' command to manage dynamically my intefaces.
I up and down eth0... but Debian  add some eth0:0:2 !!!
If I down all my interfaces and reload /etc/network/intefaces (which is 
correct), eth0:x:y are added again !!!
How to radically "remove" these bad interfaces and restart on a clean 
config.. ??

Thanks a lot,

   Benoit Lathiere (a poor French guy !).