Internet through a proxy
servers let you share a single Internet connection among
multiple PCs. Additionally, they also provide multitude
of other benefits
small and medium sized offices today have perhaps only
one Internet connection. In addition, because of the
limited infrastructure, one can connect only a single
PC to access the Internet at any given time. A simple
but expensive solution would be to install a second
phone line and buy a second modem.
A viable alternative to get more than one PC online
at your office or home would be to share your single
Internet connection. This can be achieved through various
means such as using hardware solutions such as a router
or a proxy server.
What is a proxy server?
proxy server is a kind of buffer between your computer
and the Internet resources you are accessing (e.g. websites
or FTP archives). The data you request come to the proxy
first, which then transmits the data to your PC.
Basically a proxy server sits between a client program
(usually a Web browser) and some external server (a
server on the Web). The proxy server can monitor and
intercept any and all requests being sent to the external
server or that comes in from the Internet connection.
This positioning gives the proxy server three functions:
filtering requests, improving performance, and sharing
What does a proxy server do?
main job of a proxy server is its security function.
Proxy servers can inspect all traffic (in and out) over
an Internet connection and determine if there is anything
that should be denied transmission, reception, or access.
Since this filtering cuts both ways, a proxy server
can be used to keep users out of particular websites
(by monitoring specific URLs) or restrict unauthorized
access to the internal network by authenticating users.
Since proxy servers handle all communications, they
can log everything the user does. For HTTP (Web) proxies
this includes logging every URL. For FTP proxies this
includes every downloaded file.
The other functional aspect of a proxy server is improving
performance and is called proxy server caching. In simple
terms, the proxy server analyzes user requests and determines
which, if any should have the content stored temporarily
for immediate access. Cache management is a big part
of many proxy servers, and it is important to consider
how easily the cache can be tuned and for whom it provides
the most benefit.
Some of the proxy servers, particularly those targeted
at small office/home office users, provide a means for
sharing a single Internet connection among a number
of workstations. While this has practical limits in
performance, it can still be a very effective and inexpensive
way to provide Internet services, such as e-mail, throughout
Kinds of Proxy servers
various kinds of proxy servers are:
proxies are firewalled proxy servers that are chained
to other proxy servers in order to impose different
restrictions on different user groups in a company.
They are proxy servers that are on an individual client's
computer. One of the many advantages of using a private
proxy server is SSL Tunneling, although many browsers
such as Netscape and Internet Explorer support SLL in
the software package.
These are proxy servers that are set up to "fool"
users into thinking they are connecting to a source
server. Reverse Proxy Servers are generally used for:
Replicating documents for all different geographically
To repeat content for network traffic management
why should you use a proxy?
can use a proxy server if you wish to restrict the sites
she/he is viewing. You can use it to protect yourself,
to hide your IP to prevent hackers from accessing information
about you while online. They will only get the proxy
server's IP. Proxy servers are not hard to set up, you
just need to configure your browser to connect through
Mahesh Rathod can be reached at firstname.lastname@example.org