I did what you told me.
Code:
vincent@vincent-desktop:~$ sudo -i
root@vincent-desktop:~# ifconfig
lo Lien encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:H
With ifconfig eth0 up I got nothing, and with ifconfig I got the same than ever.
Little question, why does eth0:avahi have 169.254.3.106 as IP ans lo 127.0.0.1. How can I modify that in order to get my router IP 192.168.0.1 instead??