Understanding Stateful Packet Inspection For Firewalls
In my previous article, I have talked about some of the facts that you need to know about packet filtering firewalls when it comes to network security. In this article. I want to look at all that you need to know about stateful packet inspection for firewalls. Follow as we look at all that you need to know about it in this article.
The stateful packet inspection is an improvement on basic packet filtering. This type of firewall will examine each packet, denying or permitting packet-based not only on the examination of the current packet but also on data derived from previous packets in the conversation.
This means that the firewall is aware of the content in which the packet is sent. This makes the firewall less susceptible to spoofing. SPI firewalls are less susceptible to these attacks for the following reasons:
- They can tell whether the packet is part of an abnormally large stream of packets from a particular IP address, thus indicating a possible DoS attack in progress.
- They can tell whether the packet has a source IP address that appears to come from inside the network, thus indicating IP Spoofing in progress.
- They can also look at the actual contents of the packet, allowing for some advanced content filtering capabilities.
Most quality firewalls today use stateful packet inspection method; when possible, this is the recommended type of firewall for most systems. In fact, most home routers have the option of using stateful packet inspection.
The name stateful packet inspection derives from the fact that in addition to examining the packet, the firewall is examining the packet state in relationship to the entire conversation. This means that the firewall can refer to the preceding packets as well as those packets’ contents, source, and destination. As you might suspect, SPI packets are becoming quite common.
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