[Samba] UDP listening

[BeBrA]

Hi!
I just installed samba version 2.2.3a-6 for Debian (downloaded from
www.debian.org) and I can't undestand why nmbd is always listening on all
interfaces, port 137 and 139 UDP.
I tried to use the  interfaces parameter, but it always listen on all
interfaces. Where is the problem? Here it is the [global] of my smb.conf.
Best regards,
Simone

[global]
        server string = Samba Server
        interfaces = 192.168.0.3
        bind interfaces only = Yes
        security = SHARE
        allow trusted domains = No
        log level = 1
        read raw = No
        lm announce = False
        preferred master = False
        local master = No
        domain master = False
        browse list = No
        enhanced browsing = No
        dns proxy = No
        socket address = 192.168.0.3
        create mask = 0644
        hosts allow = 192.168.0.3 127.0.0.1 192.168.0.4
        hosts deny = ALL
        write cache size = 262144
        printing = cups