A correct firewall policy can minimize the exposure of many networks however they are quite useless against attacks launched from within. Hackers are also evolving their attacks and network subversion methods. These techniques include email based Trojan, stealth scanning techniques, malicious code and actual attacks, which bypass firewall policies by tunneling access over allowed protocols such as ICMP, HTTP, DNS, etc. Hackers are also very good at creating and releasing malware for the ever-growing list of application vulnerabilities to compromise the few services that are being let through by a firewall.

IDS arms your business against attacks by continuously monitoring network activity, ensuring all activity is normal. If IDS detects malicious activity it responds immediately by destroying the attacker's access and shutting down the attack. IDS reads network traffic and looks for patterns of attacks or signatures, if a signature is identified, IDS sends an alert to the Management Console and a response is immediately deployed.

What is intrusion?

An intrusion is somebody attempting to break into or misuse your system. The word "misuse" is broad, and can reflect something severe as stealing confidential data to something minor such as misusing your email system for Spam.

What is an IDS?

An IDS is the real-time monitoring of network/system activity and the analysing of data for potential vulnerabilities and attacks in progress.
Need For IDS

Who are attacked?

Internet Information Services (IIS) web servers - which host web pages and serve them to users - are highly popular among business organizations, with over 6 million such servers installed worldwide. Unfortunately, IIS web servers are also popular among hackers and malicious fame-seekers - as a prime target for attacks!

As a result, every so often, new exploits emerge which endanger your IIS web server's integrity and stability. Many administrators have a hard time keeping up with the various security patches released for IIS to cope with each new exploit, making it easy for malicious users to find a vulnerable web server on the Internet. There are multiple issues which can completely endanger your Web server - and possibly your entire corporate network and reputation.ecuring the machine.