Download - 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