Proxy Servers

Presentation by CC09

Group Members:
Rajavardhan
Rishikesh
Rishabh
Siddharth
Sriniketan

1. PROXY SERVERS
Rajavardhan
Rishabh
Rishikesh
Siddharth
Sriniketan

2. AGENDA
Introduction
How it works
Types & Functions
Performance aspects
Advantages/Disadvantages
Demo

3. INTRODUCTION
A proxy server is a server that acts as an intermediary
between a workstation user and the Internet so that the
enterprise can ensure security, administrative control,
and caching service.
By using the proxy server you can hide, conceal and
make your network id anonymous by hiding your IP
address
A server that sits between a client application, such as a
Web browser, and a real server

4. HOW DOES IT WORK?

5. HOW DOES IT WORK?

6. TYPES AND FUNCTIONS
Caching Proxy : A caching proxy server accelerates service
requests by retrieving content saved from a previous request made
by the same client or even other clients
Web proxy : A proxy that focuses on World Wide Web traffic is
called a "web proxy". The most common use of a web proxy is to
serve as a web cache.
Content-filtering web proxy : A content-filtering web proxy
server provides administrative control over the content that may
be relayed through the proxy. It is commonly used in both
commercial and non-commercial organizations (especially schools)
to ensure that Internet usage conforms to acceptable use policy

7. TYPES AND FUNCTIONS
Anonymizing proxy : An anonymous proxy server
(sometimes called a web proxy) generally attempts to
anonymize web surfing.
Intercepting proxy : An intercepting proxy combines a
proxy server with a gateway or router .Connections
made by client browsers through the gateway are
diverted to the proxy without client-side configuration.

8. TRANSPARENT / OPAQUE SERVERS
Transparent – both parties (local/remote) are unaware that the
connection is being proxied
Zorp - application layer proxy is transparent
Opaque – the local party must configure client software to use the
proxy
client software must be proxy-aware software
Netscape proxy server is opaque
With all of the things modern firewalls can do in the area of
redirection you could configure the firewall to redirect all http
requests to a proxy
no user configuration required (transparent)

9. PERFORMANCE ASPECTS
Caching
By keeping local copies of frequently accessed file the proxy can serve
those files back to a requesting browser without going to the external
site each time, this dramatically improves the performance seen by the
end user
Only makes sense to implement this at the ISP rather than the small
business level because of the number of pages available
Because of dynamic content many pages are invalidated in the cache
right away
Load balancing (Reverse Proxy)
A proxy can be used in a reverse direction to balance the load amongst
a set of identical servers (servers inside the firewall and users outside)
Used especially with web dynamic content (.asp, .php,.cfm,.jsp)

10. SECURITY ADVANTAGES
Hide internal clients from external network
Blocking of dangerous URLs
Filter dangerous content
Eliminate need for transport layer routing between networks
Single point of access, control and logging

11. PROXY LIABILITIES
Single point of failure
if the proxy dies , no one can get to the external network
Client software must usually be designed to use a proxy
Doesn’t protect the OS
proxies run at the application level
Usually optimized for performance rather than security
WINGATE was installed to be easy to configure; opened a winsock proxy
to the external interface, which let hackers essentially hijack the machine
Create a service bottleneck
solved via parallelism (more proxies, and load balance)

12. Softwares
Invisible IP Map
Windows 2000 to Vista Compatible
Linux Compatible
Works without a considerable drop in performance
Invisible Browsing
Windows XP to Windows 7 compatible
Mac OS X compatible
Wide variety of proxy servers.

13. References
www.publicproxyservers.com
 www.sourceparadise.org
www.wikipedia.com/proxyservers
www.howstuffworks.com/firewall
www.slideshare.com/proxyservers
www.isaserver.orgwww.isaserver.org

14. Acknowledgments
We would like to thank our guide for the project
Mr. Raja Ram Gowda for his support and our
professor Mr. Siddesh S. for giving us the
opportunity to work on the same.

15. APPLAUSE
THANK YOU FOR LISTENING!