proxy servers

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 proxiesHow a proxy works ?Proxy typesAdvantages/DisadvantagesPopular hardware & software proxiesReferencesAcknowledgements

What is proxy ?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 proxiesImprove Performance

Act as Cache server

Filter RequestsPrevent access to some web sites!!!Time division

Surfing AnonymouslyBrowsing 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:

1. Proxy services lag behind nonproxied services.

2. Proxy services may require different servers for each service.

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

Improve Performance

CachingReduce latencyReduce 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 Kbps1 Mbps

Proxy typesWeb proxiesTransparent proxiesOpen proxiesAnonymous proxies

Proxy setting in IEProxy 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 , …

ServerAt least 2 network cardsDIRECT 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

LAN

INTERNET

Proxy Server

IP : 172.16.0.2

Gw : 172.16.0.1

IP : 172.16.0.1

Source IP

172.16.0.2www.yahoo.com

Dest IP209.191.93.52

IP : 217.219.66.2

Gw : 217.219.66.1

LAN

INTERNET

Proxy Server

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

Source IP

217.219.66.2www.yahoo.com

Dest IP209.191.93.52

Change Source IP Address

Source IP

172.16.0.2www.yahoo.com

Dest IP209.191.93.52

LAN

INTERNET

Proxy Server

IP : 217.219.66.2

Gw : 217.219.66.1

IP : 172.16.0.1

Source IP

209.191.93.52

Dest IP217.219.66.2

Change Dest. IP Address

Source IP

209.191.93.52

Dest IP172.16.0.2

IP : 172.16.0.2

Gw : 172.16.0.1

LAN

INTERNET

Proxy Server

IP : 217.219.66.2

Gw : 217.219.66.1

IP : 172.16.0.1

Source IP

209.191.93.52

Dest IP217.219.66.2

Change Source IP Address & Destination IP Address

IP : 172.16.0.2

Gw : 172.16.0.1

LAN

INTERNET

Proxy Server

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

Source IP

209.191.93.52

Dest IP172.16.0.2

Popular hardware & software proxiesSoftware Proxy Hardware Proxy

Ms. ISA ServerMs. ISA Server Cisco PIXCisco PIX

SquidSquid Blue CoatBlue Coat

Kerio WinRouteKerio WinRoute CyberoamCyberoam

1st Up Net Server1st Up Net Server AlacerAlacer

CCProxyCCProxy

CProxyCProxy

Windows ICSWindows ICS

WinGateWinGate

Thank You,Thank You,

References :References :

www.cisco.comwww.cisco.com www.isaserver.orgwww.isaserver.org www.wikipedia.comwww.wikipedia.com www.cert.orgwww.cert.org www.isc.sans.orgwww.isc.sans.org www.zonelabs.comwww.zonelabs.com www.symantec.com www.mshdiau.ac.ir

Regards to • Mr Siddesh • Mr Rajaram Gowda

Acknowledgements