Thanks for the quick answer
> Do you see your access point, if you do a scan?
>
> # iwlist eth1 scan

Yes! I got:

# /sbin/iwlist eth1 scan
eth1      Scan completed :
          Cell 01 - Address: 00:00:00:B5:FB:00
                    ESSID:"observatoire-portail"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:9
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Quality=51/100  Signal level=-78 dBm  Noise 
level=-78 dBm
                    Extra: Last beacon: 11192ms ago
>
> If yes, for example use "system-config-network" to configure your 
> wireless settings.

So I set the mode to Master and channel to 9 but then I get:
"Error for wireless request "Set Mode" (8B06) :
    SET failed on device eth1 ; Invalid argument."
"Définition des informations IP pour eth1. échoué. Aucun lien n'a été 
trouvé. Vérifier le câble ?"

Do you know why?
Thanks a lot.

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