Install Squid Proxy Server on CentOS / Redhat enterprise Linux 5

sumber : http://www.cyberciti.biz/tips/howto-rhel-centos-fedora-squid-installation-configuration.html

# yum install squid



Squid Basic Configuration

# vi /etc/squid/squid.conf

At least you need to define ACL (access control list) to work with squid. The defaults port is TCP 3128. Following example ACL allowing access from your local networks 192.168.1.0/24 and 192.168.2.0/24. Make sure you adapt to list your internal IP networks from where browsing should be allowed:

acl our_networks src 192.168.1.0/24 192.168.2.0/24
http_access allow our_networks

# chkconfig squid on
# /etc/init.d/squid start

# netstat -tulpn | grep 3128



tcp        0      0 0.0.0.0:3128                0.0.0.0:*                   LISTEN      20653/(squid)

Open TCP port 3128

Finally make sure iptables is allowing to access squid proxy server. Just open /etc/sysconfig/iptables file:
# vi /etc/sysconfig/iptables
Append configuration:
-A RH-Firewall-1-INPUT -m state --state NEW,ESTABLISHED,RELATED -m tcp -p tcp --dport 3128 -j ACCEPT
Restart iptables based firewall:
# /etc/init.d/iptables restart
Output:

Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ] Applying iptables firewall rules: [ OK ] Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]

Client configuration

Open a webbrowser > Tools > Internet option > Network settings > and setup Squid server IP address and port # 3128.