Awesum4sum

Team Members

• Lisha Murthy (1MS07IS041)• Anitha B. S (1MS07IS005)• Caroline I (1MS07IS017)• Prabha P (1MS07IS068)

Index

• Introduction to Proxy Server• Anonymous Proxy Server• HTTP Proxy Server • FTP Proxy Server• Caching• Content Filtering• ICAP• Reverse Proxy Server• Advantages and Disadvantages of Proxy Server• Demonstration on CC Proxy

PROXY SERVER

WHAT IS A PROXY SERVER

Client sends a request

Server provides the services

CLIENT WEB SERVER

CLIENT WEB SERVER

PROXY SERVERSends request to the

Proxy ServerMakes requests for the client

ANONYMOUS PROXY SERVERS

Web resources can collect information aboutyou, using your IP address.

You might be targeted by the marketers who send regular spam and junk e-mails.

A website can automatically exploit the security holes in your system.

WHY DO WE NEED AN ANONYMOUS PROXY SERVER

WHAT IS AN ANONYMOUS PROXY SERVER

Anonymous Proxy Server hides your IP address.

They do not let anyone know what you are surfing.

192.245.17.1

201.124.17.1

When few sites are blocked by the internet providers in certain countries or geographical areas, anonymous proxy servers can be used.

Anonymous surfing proxy sites

They allow you to enter the address (URL) of the site you wish to go to at the anonymous surfing proxy site.

The site will retrieve the page for you and present it to you.

The site you visit will not receive any particulars about your system.

Introduction to HTTP

Hypertextor

Hyperlinks

Thus formed Internet…

Ideal Scenario

With Proxy

FTP

File Sharing• Over Windows LAN• FTP• P2P• Email• Online sharing

File Transfer Protocol

FTP Proxy Servers

Available applications for both HTTP and FTP Proxy servers

• Web browsers• Proxy Chains• Download managers• Operating system (with lots of configuration)

Cache

It is a collection of dataduplicating original valuesstored elsewhere

Caching proxy server

Page-fetch algorithm Check cache for existing copy of object

If it exists in cache…….

If object is not in cache, expired, or otherwise invalidated…….

Cacheable objects

HTTP FTP

Non-cacheable objects

HTTPS WAIS

Content filtering proxy server

Content filtering is theprocess of removing certain content from the internet before it gets to the user that requested that User.

Eg: Twilight utilities proxy server Safeguard content filtering proxy.

Internet Content Adaptation Protocol (ICAP)

• ICAP servers are focused on a specific function, for example, add insertion, virus scanning, content translation, language translation, or content filtering.

• ICAP allows its clients to pass HTTP based (HTML) messages (Content) to ICAP servers for adaptation (content manipulation).

Functions of icap

For request modification……. ….redirection, header filtering, etc.

For response modification……. …. virus scanning, content modification, block

inappropriate content, etc.

REVERSE PROXY

CLIENT 1 CLIENT 2 CLIENT 3

WEB SERVER

INTERNET

CLIENT 1CLIENT 2

CLIENT 3

PROXY SERVER

WEB SERVER

FORWARD PROXY SERVER

WEB SERVER

INTERNET

REVERSE PROXY SERVER

CLIENT 1CLIENT 3

CLIENT 2

REVERSE PROXY SERVER

SECURITY

INTERNET

WEB SERVER

REVERSE PROXY

Acts as a additional layer of defense and protects against some OS and Web server specific attacks.

CACHING

INTERNET

WEB SERVER

Can offload the web server by caching most frequently used web pages.

cache

LOAD BALANCING

INTERNET

WEB SERVER

cache

Less load on the server as the cache stores the static web pages

COMPRESSION

Awesum 4sumAwesum

4sum

Compress content before delivering it to site visitors to optimize load times.

TUNNELINGWEB

SERVER

INTERNET

CLIENT 1

Proxy server

It is a web-based page that takes a site that is blocked and "tunnels" it, allowing the user to view blocked pages.

ADVANTAGES

• Remain anonymous to the server.

• Cache proxies reduces load on main server.

• Acts as a security layer for clients and main server.

• Can block any website from access

• Can be used to view certain unblocked web sites.

• Faster loading of page is achieved.

DISADVANTAGES

• Not completely anonymous.

• Data can be misused.• Need to maintain a

database for Blacklist and White list.