Published on March 5, 2014
1 Proxy Server
Proxy Server • A proxy server is a program that is installed on a machine that has direct access to the internet. • The program accept request from the user on LAN and enables them to access the internet from their work station. 2
Proxy Server • The process is encapsulated from the use that is the users can’t distinguish between live connectivity to the internet but proxy based access to the internet. 3
Proxy Server • There are various types of proxy server available some of the most commonly used proxy servers are: 1)Squid internet object cache proxy 2)Microsoft proxy server 2.0 3)Apache server 4
Squid Proxy Server • Squid is caching proxy server, which improves the bandwidth and the response time by caching the recently requested web pages. 5
Squid Proxy Server • Squid provides proxy and cache services for HTTP, FTP, and various other protocols. 6
Installing the Squid Proxy $rpm -ivh squid-2.5.STABLE63.4E.12.i386.rpm 7
Squid Proxy Server configuration file (1) $ vi /etc/squid/squid.conf Providing a name for the proxy server machine. visible_hostname proxy.MySite.com In the above example, instead of proxy.MySite.com specify the hostname of your machine. 8
Squid Proxy Server configuration file (2) Specifying the interface and port number on which the proxy server should listen. 9
Squid Proxy Server configuration file (3) Example: your proxy server has an ip address 192.168.60.70 which belongs to the local area network 184.108.40.206/24 Change the variable http_port as shown. $ http_port 192.168.60.70:3456 10
Squid Proxy Server configuration file (4) Now start the squid proxy services_ $ /etc/init.d/squid start 11
Test the Squid Configuration In Firefox web browser, to set the proxy settings goto Edit Preferences and window similar to shown next slide will be displayed. 12
Test the Squid Configuration 13
Test the Squid Configuration 14
Using Apache Web Server To Configure Proxy Server Apache web server is pre-installed with RedHat distribution No need additional installation Easy to configure on Linux system 15
Types of proxy servers 1) 2) 3) 4) Transparent Proxy Anonymous Proxy Distorting Proxy High Anonymity Proxy 16
Transparent Proxy Server identifies itself as a proxy server. Makes the original IP address available through the http headers. Used for their ability to cache websites. 17
Transparent Proxy Do not effectively provide any anonymity to those who use them. Use of a transparent proxy will get you around simple IP bans. Transparent in the terms that your IP address is exposed, not transparent in the terms that you do not know that you are using it. 18
Anonymous Proxy Server identifies itself as a proxy server. Does not make the original IP address available. Detectable, but provides reasonable anonymity for most users. 19
Distorting Proxy Server identifies itself as a proxy server. Make an incorrect original IP address available through the http headers. 20
High Anonymity Proxy Server does not identifies itself as a proxy server. Does not make available the original IP address. 21
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Abstract This document provides guidance and an overview to high level general features and updates for SUSE Linux Enterprise Server 11 Service Pack 3 (SP3).