Proxy Servers

PROXYMITY- CC8

Team members

Chaithra T R 1MS08IS402

Tejus .R 1MS07IS107

Vijetha P.C 1MS07IS114

Vishal Agarwal 1MS07IS116

Contents:

What is proxy ?

Main purpose of using proxies

How a proxy works ?

Proxy types

Advantages/Disadvantages

Popular hardware & software proxies

References

Acknowledgements

What is proxy ? Proxy Proxy is hardware / software Indirect access to other networks e.g INTERNET. all computers on the local network have to go through it before accessing information on the Internet. Organization , universities , companies use proxy systems Proxy act as gateway Proxy act as Cache Server Proxy share a connection to others LAN INTERNET

Main purpose of using proxies

Improve Performance

Act as Cache server

Filter Requests

Prevent access to some web sites!!!

Time division

Surfing Anonymously

Browsing the WWW without any identification!!!

Advantages:

1. Security.

2. To speed up access to a resource –”caching”.

3. To censor network services or content.

4. Improve performance.

5. When you connect to a website, your true IP address will not be shown, but the proxy servers IP will, this does not mean that your completely anonymous. The proxy server will have logs of IP’s that used the proxy server.

Then why need of proxy???

To avoid access to particular webpages.

To hide your IP address,hence no room for hackers.

Disadvantages:

Proxy services lag behind nonproxied services.

Proxy services may require different servers for each service.

Proxy services usually require modifications to clients, procedures, or both.

Improve Performance

Caching

Reduce latency

Reduce Network Traffic

Caching can greatly speed up Internet access. If one or more Internet sites are frequently requested, they are kept in the proxy's cache, so that when a user requests them, they are delivered directly from the proxy's cache instead of from the original Internet site.

Caches diminish the need for network bandwidth, typically by 35% or more, by reducing the traffic from browsers to content servers.

INTERNET 64 Kbps 128 Kbps 512 Kbps 1 Mbps

Proxy types

Web proxies

Transparent proxies

Open proxies

Anonymous proxies

Proxy setting in IE

How does a proxy server work?

A proxy server receives a request for an Internet service.

If it finds the page, it returns it to the user without needing to forward the request to the Internet.

If the page is not in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own IP addresses to request the page from the server out on the Internet

What do you need for proxy installation?

Proxy Software

Ms ISA Server , Squid , WinRoute , …

Server

At least 2 network cards

DIRECT INTERNET connection (Public IP Address)

Switch/Hub (elective)

Private IP Address

10.0.0.1/8 – 172.16.0.1/16 – 192.168.0.1/24

IP : 172.16.0.2 Gw : 172.16.0.1 IP : 172.16.0.1 IP : 217.219.66.2 Gw : 217.219.66.1 LAN INTERNET Proxy Server Source IP 172.16.0.2 www.yahoo.com Dest IP 209.191.93.52

IP : 172.16.0.2 Gw : 172.16.0.1 IP : 217.219.66.2 Gw : 217.219.66.1 IP : 172.16.0.1 Change Source IP Address LAN INTERNET Proxy Server Source IP 217.219.66.2 www.yahoo.com Dest IP 209.191.93.52 Source IP 172.16.0.2 www.yahoo.com Dest IP 209.191.93.52

IP : 217.219.66.2 Gw : 217.219.66.1 IP : 172.16.0.1 Change Dest. IP Address IP : 172.16.0.2 Gw : 172.16.0.1 LAN INTERNET Proxy Server Source IP 209.191.93.52 Dest IP 217.219.66.2 Source IP 209.191.93.52 Dest IP 172.16.0.2

IP : 217.219.66.2 Gw : 217.219.66.1 IP : 172.16.0.1 Change Source IP Address & Destination IP Address IP : 172.16.0.2 Gw : 172.16.0.1 LAN INTERNET Proxy Server Source IP 209.191.93.52 Dest IP 217.219.66.2

IP : 172.16.0.2 Gw : 172.16.0.1 IP : 217.219.66.2 Gw : 217.219.66.1 IP : 172.16.0.1 LAN INTERNET Proxy Server Source IP 209.191.93.52 Dest IP 172.16.0.2

Popular hardware & software proxies Software Proxy Hardware Proxy Ms. ISA Server Cisco PIX Squid Blue Coat Kerio WinRoute Cyberoam 1st Up Net Server Alacer CCProxy CProxy Windows ICS WinGate

Thank You,