Proxy server

Proxy server

Proxy server is used to share the internet connection with many clients

Proxy server can be configured as :

A simple proxy server which used to share the internet connection

A caching web server which is used  to store web pages locally to improve performance

A firewall which is used to control to access the internet

Squid proxy is the widely used open source product.

Server Configuration

Service profile

Service:  squid

Package:squid

Port no:3128 (default)

Configuration file: //etc/squid/squid.conf

Script file: /etc/ init.d/squid

Daemons: squid

Objective :To share internet connection

[root@proxy~]#yum install squid* -y

Edit the main configuration

[root@proxy~]#vi /etc/squid/squid.conf

##to configure simple proxy##

http_port 3128     #line no.73   3128 is default port we can use any port number other than that

visible_hostname     Rajashekar    #line no 2831

##to configure caching proxy##

cache_dir ufs/var/spool/squid 100 16 256

##to configure firewall proxy##

##Find the line beginning with acl localhost and At the end of the section, add:

#create rule for particular network

acl rajunetwork src 192.168.0.0/24

##Authorizing access to group

#Locate the line http_access allow and add below (before the line http_access deny all)

http_access allow rajunetwork

##Allow the use non-standard ports

By default, Squid allows HTTP traffic only on specific ports (e.g. 80). This can cause problems on websites using other ports.

##To avoid this deadlock, find the line http_access deny! Safe_ports and the edit it to:

 # http_access deny! Safe_ports

:wq!

[root@proxy~]#chkconfig squid on

[root@proxy~]#service squid restart

Client configuration

For proxy browser is a client whether it may be on server or client

For Firefox

Open firefox

Tools->options->advanced tab->network->connection->settings->Manual proxy configuration->

Http proxy   server ip   port 3128