A combination of the two firewalls above, the stateful firewall inspection offer a higher level of protection for your business. The problem with these is that they take up more resources, which can slow down the legitimate packet transfer.

A proxy firewall operates at the application layer as a middleman to filter incoming traffic between an end system and another end system.

If you want firewalls that operate at the application layer to filter traffic, proxy firewalls do the job. These are cloud-based most of the time, and they establish traffic connections and examine data packets coming through. The difference between these and the stateful inspection firewalls is that the proxy firewalls can also do a more in-depth inspection to check the packet contents. 

There’s no real insight into what makes a firewall today “next-generation” besides the time it was created. There are commonalities between these firewalls and the originals, and those include TCP handshakes and packet inspections. Next-generation firewalls also use IPS – intrusion prevention systems – to stop network attacks.

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