J'ai trouvé ! :) → http://httpd.apache.org/docs/2.0/fr/mod/core.html#satisfy
Et donc :
<Directory /var/lib/mediawiki/>
Options +FollowSymLinks
AllowOverride All
order deny,allow
deny from all
AuthType Basic
AuthName "XXX Wiki:)"
AuthUserFile /usr/local/xxx/intranet-users
AuthGroupFile /usr/local/xxx/intranet-groups
Require user xxx
Allow from 192.168.0.0/24
Satisfy Any
</Directory>
Et ça marche :)
À+,
Serge.

