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A firewall is a set of interrelated programs, sited at a network gateway server that safeguards the resources of a remote network from users from other networks. Simply put, the terminology also denotes the stringent security guiding principle that is used with the programs. An organization with an Intranet that enables its employees to access the wider Internet installs a firewall to inhibit interlopers from accessing its own private data resources and for monitoring or regulating what external resources its own users have access to.

Principally, a firewall, usually works in close association with router programs to inspect each and every network packet to regulate whether en route it towards its destination or not. A firewall also comprises or works with a proxy server that generates network requests on behalf of the end-users. A firewall is time and again installed in a specifically selected computer separate from the rest of the network so that no inbound request can get directly at private network resources.

There are numerous of firewall screening procedures. One of the simplest is to screen requests to ensure that they come from identified domain name and Internet Protocol addresses. For mobile users, firewalls enable them to remotely access in to the private network simply by using secure login procedures and validated certificates.

A dozen of companies are there in the market that are creating firewall products. These service providers usually offer some of the featured services that include logging and reporting, automatic alarms rise during the time of unexpected threats, and a graphical user interface for managing the firewall.


1. What is firewall? - Definition from