root@gateway:~# apt-get install squid3

root@gateway:~# cd /etc/squid3/

root@gateway:/etc/squid3# cp -p squid.conf{,.dist}

root@gateway:/etc/squid3# cat squid.conf
# OPTIONS FOR AUTHENTICATION
# -----------------------------------------------------------------------------
# ACCESS CONTROLS
# -----------------------------------------------------------------------------
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
acl sub_a src 192.0.2.0/24
acl sub_b src 198.51.100.0/24
acl to_sub_a dst 192.0.2.0/24
acl to_sub_b dst 198.51.100.0/24
 
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		# wais
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
 
###### ACL's ###### 
 
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
 
###### REGRAS ###### 
http_access allow sub_a
http_access allow sub_b
http_access allow to_sub_a
http_access allow to_sub_b
http_access deny all
 
# NETWORK OPTIONS
# -----------------------------------------------------------------------------
http_port 3128
 
# MEMORY CACHE OPTIONS
# -----------------------------------------------------------------------------
#Default:
# cache_mem 256 MB
cache_mem 64 MB
 
# DISK CACHE OPTIONS
# -----------------------------------------------------------------------------
cache_dir ufs /var/spool/squid3 100 16 256
 
# OPTIONS FOR TROUBLESHOOTING
# -----------------------------------------------------------------------------
coredump_dir /var/spool/squid3
 
# OPTIONS FOR TUNING THE CACHE
# -----------------------------------------------------------------------------
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
 
# ADMINISTRATIVE PARAMETERS
# -----------------------------------------------------------------------------
visible_hostname proxy.exemplo.org
 
# ERROR PAGE OPTIONS
# -----------------------------------------------------------------------------
error_default_language pt-br

root@gateway:/etc/squid3# squid3 -k reconfigure

root@gateway:/etc/squid3# service squid3 stop
[ ok ] Stopping Squid HTTP Proxy 3.x: squid3.

root@gateway:/etc/squid3# squid3 -z
2016/07/14 18:07:39| Creating Swap Directories
2016/07/14 18:07:39| /var/spool/squid3 exists
2016/07/14 18:07:39| Making directories in /var/spool/squid3/00
2016/07/14 18:07:40| Making directories in /var/spool/squid3/01
2016/07/14 18:07:40| Making directories in /var/spool/squid3/02
2016/07/14 18:07:40| Making directories in /var/spool/squid3/03
2016/07/14 18:07:40| Making directories in /var/spool/squid3/04
2016/07/14 18:07:40| Making directories in /var/spool/squid3/05
2016/07/14 18:07:40| Making directories in /var/spool/squid3/06
2016/07/14 18:07:40| Making directories in /var/spool/squid3/07
2016/07/14 18:07:40| Making directories in /var/spool/squid3/08
2016/07/14 18:07:40| Making directories in /var/spool/squid3/09
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0A
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0B
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0C
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0D
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0E
2016/07/14 18:07:40| Making directories in /var/spool/squid3/0F

root@gateway:/etc/squid3# service squid3 start
[ ok ] Starting Squid HTTP Proxy 3.x: squid3.