Sourcefire developed Snort, an open source intrusion prevention system capable of real-time traffic analysis and packet logging. Snort was acquired (and is now supported) by Cisco in 2013.
IPS sensors are more suited for companies that do not have visibility into their network with third-party analyzing tools. Scenarios would be to place IPS sensors at the perimeter firewalls mainly. IPS sensors are less appropriate for companies that have third-party analyzing tools that will mitigate vulnerabilities and malicious traffic and activities already.
If a colleague was looking to tighten down their network I can easily recommend Snort to them. It gives you some more peace of mind knowing that its always scanning traffic for malicious looking code. Even things your major firewalls and security hardware might miss, Snort has picked up. Its an easy recommendation for me.
IPS sensors provides the necessary network visibility my company needs to satisfy its security appetite. By doing so, we have been able to stay compliant and up to date with today's network security requirements and procedures. We are able to be proactive with vulnerabilities and reactive to malicious traffic and intrusions in our day to day operations.
For our organization, the Cisco defense in depth concept works the best. While Cisco can be made to work with other vendors, we have found the best in depth protection by integrating Cisco products for maximum visibility. We had a Barracuda Web Filter, but it was difficult to maintain when you had limited scope on what you could block, so we created a whitelist only setup which required a lot of additional manpower. This wouldn't have covered new threats with DNS spoofing and the like. Sourcefire also integrated with our anti-malware platform (Cisco AMP) for even better visibility on what may be happening on the end users workstation. We are planning on adding in Cisco ISE to complete the approach and possibly stealthwatch to cover our bases in the future. The Palo Alto gear was interesting, but it was priced far out of our range.
