Proxy Server - Linux

1. 1
Proxy Server

2. 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.
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3. 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.
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4. 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
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5. Squid Proxy Server
• Squid is caching proxy server,
which improves the bandwidth
and the response time by caching
the recently requested web pages.
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6. Squid Proxy Server
• Squid provides proxy and
cache services for HTTP, FTP,
and various other protocols.
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7. Installing the Squid Proxy
$rpm -ivh
squid-2.5.STABLE63.4E.12.i386.rpm
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8. 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.
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9. Squid Proxy Server configuration file
(2)
Specifying the interface and port
number on which the proxy server
should listen.
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10. 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 92.168.60.0/24
Change the variable http_port as
shown.
$ http_port 192.168.60.70:3456
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11. Squid Proxy Server configuration file
(4)
Now start the squid proxy services_
$ /etc/init.d/squid start
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12. 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.
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13. Test the Squid Configuration
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14. Test the Squid Configuration
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15. 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
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16. Types of proxy servers
1)
2)
3)
4)
Transparent Proxy
Anonymous Proxy
Distorting Proxy
High Anonymity Proxy
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17. 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.
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18. 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.
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19. 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.
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20. Distorting Proxy
 Server identifies itself as a proxy
server.
 Make an incorrect original IP
address available through the
http headers.
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21. High Anonymity Proxy
 Server does not identifies itself
as a proxy server.
 Does not make available the
original IP address.
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