How to Know If Your Firewall Uses ‘Stateful Inspection’

How to Know If Your Firewall Uses ‘Stateful Inspection’

One of the most important aspects of a firewall is whether or not it uses “stateful inspection.” This means that when you visit a website, your internet service provider (ISP) will send data to the firewall. The firewall will then analyze this data and decide if it should be allowed in.

The ability for firewalls to use stateful inspection has made them more difficult for hackers to get through, which is why they are so popular these days. In this article, we’ll discuss how you can know if your firewall uses “stateful inspection,” as well as what benefits it offers.

What does stateful inspection mean on a firewall?

A firewall that uses “stateful inspection” will analyze the data coming from your computer. The firewall will then allow or block this data depending on whether it’s part of an established connection or not.

When you visit a website, stateful firewalls can tell if incoming packets are being sent in response to something outgoing from your computer. For instance, if your computer opens a connection with Google’s web servers and then sends packets to that connection, the firewall will see this as part of an established session.

This ability has helped stateful firewalls become more secure than their predecessors because it ensures no unknown connections are being opened from within your network. If something suspicious is found, the firewall will notify your IT administrator.

What are some benefits of stateful inspection?

When it comes to internet security tools, “stateful inspection” has become one of the most popular because it creates a more secure network environment for end-users. This technology provides an extra layer of protection that ensures computers can’t be infected by malicious software or have data taken from them without permission.

In addition, this technology ensures that people don’t accidentally download viruses and other harmful programs onto their computers. The firewall will block any unknown connections to your computer so users can safely surf the web without worrying about malware infecting their machines.

How does a stateful firewall keep track of connections?

To know if incoming data belongs in a current session, the firewall uses something called a state table. This is a list of all open connections and keeps track of where they are going.

Once an established connection has been made between two computers on the internet, it will be listed in this table so that any packets traveling along these routes will be allowed. The firewall only allows data through these connections, but it also monitors them to make sure nothing suspicious is happening within your network.

This table makes the process of analyzing incoming packets much faster because the firewall doesn’t have to go back and forth between computers at both ends to determine if the packets are part of an established connection or not.

As you can see, stateful inspection is a powerful tool that helps keep your computer secure. If you want to find out if your firewall uses this technology, be sure to contact us today so we can help protect your network.

How can a TCP SYN/ACK scan be detected in a stateful Firewall?

A TCP SYN/ACK scan can be detected in a stateful firewall when it is monitoring incoming connections and sees data that does not belong on an established connection. If the firewall notices data coming from an unknown IP address, it will flag this activity and notify your IT administrator.

What types of Firewalls use Stateful Inspection?

Firewalls like the Cisco ASA, Juniper SSG Series, and Palo Alto Networks firewalls use stateful inspection technology. These types of firewalls are widely used in business environments because they offer a high level of protection from cyber attacks without impeding your employees’ internet activity.

All firewalls made today that are considered “stateful” and use the stateful inspection to keep internet traffic running smoothly and securely.

How should I choose a Firewall that works with my ISP?

You first need to figure out what kind of connection you have. You can do this by visiting the website for your internet service provider and looking under “service options”. If you are currently using DSL, cable internet or fiber optic, the firewall will need to be able to handle that protocol.

You also need to consider your network setup. Some firewalls work better for home networks while others are more suited for large office deployments.

Finally, you need to look at what kind of performance your firewall will provide. If it is slowing down the connection or making things run more slowly than usual, it may not be a good fit for your business.


As you can see, stateful inspection is a powerful technology that helps keep your network secure and efficient. This type of firewall is a great choice for any business that values its security and network speed, while also being easy to set up.

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