[squid-users] empty cache

Hi, I've already post with a similar subject but I think it's different. I run squid 24h/24h and my cache directory remains empty. I don't know why no object is cached on disk.
Here is a brief of my configuration
Squid -v
Squid Cache: Version 2.6.STABLE12
configure options: '--enable-storeio=aufs,null,ufs' '--with-large-files'
Here some of my squid.conf

http_port 3128 transparent
cache_mem 100 MB
maximum_object_size 25600 KB
maximum_object_size_in_memory 24 KB
cache_dir aufs /usr/local/squid/var/cache2 2500 16 256
url_rewrite_program /usr/local/bin/squidGuard -c /usr/local/squidGuard/squidGuard.conf
url_rewrite_children 80
acl our_networks src 172.16.0.0/12
http_access allow our_networks
no_cache deny our_networks
## purger site
acl PURGE method PURGE
http_access allow PURGE localhost
http_access deny PURGE
###
http_access allow localhost
# And finally deny all other access to this proxy
http_access deny all
cache_effective_user squid
#Default:
# wccp_router 0.0.0.0
wccp2_router 172.20.20.11
wccp2_router 172.20.20.12
wccp_version 4
wccp2_forwarding_method 2
wccp2_return_method 2
wccp2_assignment_method 1
wccp2_service standard 0 password=xxxxx

all the other option is default option

----------------------------
Guillaume Chartrand
Technicien informatique
Cégep régional de Lanaudière
Centre administratif, Repentigny
(450) 470-0911 poste 7218
Received on Mon Mar 31 2008 - 11:44:44 MDT