Isso funciona para minha área local 192.168.0.xxx:
<VirtualHost *:8888>
...
DocumentRoot /var/www/local/
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www/local/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order deny,allow
Deny from all
Allow from 127.0.0.0/255.0.0.0 ::1/128
Allow from 192.168.0.0/255.255.255.0
</Directory>
...