Understanding Pre-emptive Blocking In Network Security
In my previous article, I have talked about all that you need to know about firewall implementation in network security. In this article, I want to talk about all that you need to know about pre-emptive blocking in network security. Follow me as we are going to look at this together in this article.
Pre-emptive blocking in network security seeks to prevent intrusion from happening before they occur. This is done by observing any danger signs of imminent threats and than blocking the user or IP address from which this sign originates. Example of this technique include attempts to detect the early footprinting stages of an imminent intrusion.
If you find that a particular IP address is the source of frequent port scans and other scans of your system, then you will block that IP address at the firewall.
This type of intrusion and avoidance can be quite complicated in which it could potentially block a legitimate user by mistake. The complexity arises from distinguishing legitimate traffic from that indicative of an impending attack. This can lead to the problem of false positives, in which the system mistakenly identifies legitimate traffic as some forms of attacks.
Usually, a software system will simply alert the administrator that suspicious activity has taken place. A human administrator will then make the decision whether or not to block the traffic. If the software automatically blocks any addresses it deems as malicious, you run the risk of blocking out legitimate users.
It should also be noted that nothing prevents the offending user form moving to a different machine to continue the attack. The sort of approach should only be one part of an overall intrusion-detection strategy and not the entire strategy.
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