Squid3 default configuration in Ubuntu 12.04 Server LTS

Just copy and paste the following red code and restart the specified installed squid3 service in Ubuntu12.04 Server LTS

In the localnet, you can mention your own network(s).
Note: This is not blocking any website specifically.

acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl localnet src 192.168.10.0/24 10.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80 #http
acl Safe_ports port 21 #ftp
acl Safe_ports port 443 #https
acl Safe_ports port 70 #gopher
acl Safe_ports port 210 #waim
acl Safe_ports port 1025-65535 #unregistered ports
acl Safe_ports port 280 #http-mgmt
acl Safe_ports port 488 #gss-http
acl Safe_ports port 591 #filemaker
acl Safe_ports port 777 #multiling http

acl CONNECT method CONNECT

http_access allow manager localhost
http_access allow localnet
http_access deny manager
http_access deny !Safe_ports
http_access deny to_localhost

icp_access deny all
htcp_access deny all

# block all other access
http_access deny all

http_port 3128 transparent
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid3/access.log squid

#Suggested default:
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid3