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how to configure transparent squid proxy server in centos 6.4
1 step
squid installation
open terminal and type following command
#yum install squid -y
2 step
now edit and change main configuration file
#nano /etc/squid/squid.conf
# TRANSPARENT SQUID ON CENTOS 6.4
# Recommended minimum configuration:
#
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 lan src 192.168.1.1/8 #******YOUR LOCAL LAN (NEW LINE)*****
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 172.16.0.0/12 # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7 # RFC 4193 local private network range
acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines
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
#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to certain unsafe ports
http_access deny !Safe_ports
# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports
# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost
# And finally deny all other access to this proxy
http_access deny all
http_access allow lan ############(ADD NEW LINE)#########
# Squid normally listens to port 3128
http_port 3128 transparent
# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?
# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256
# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid
# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0f
refresh_pattern . 0 20% 4320
#visible_hostname localhost #######ADD NEW LINE#######
step 3
now, change firewall rule
type command
#iptables -I INPUT -s 192.168.8.14/8 -p tcp --dport 4480 -j ACCEPT
#iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j DNAT --to #192.168.8.14:4480
#iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 4480
#service iptables save
#service iptables restart
step 4
start squid service
command
#service squid restart
** Shorewall Firewall
# vi rules
# Force All web traffic to the Squid proxy server
REDIRECT loc 3128 tcp www
REDIRECT loc 3128 tcp 8080
REDIRECT loc 3128 tcp 443 # [https]
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