Willful and malicious enterprise end-users can easily bypass policies implemented in stateful inspection firewalls.
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My question to Richard would be, what Critical or High Risk does a port-based, stateful inspection firewall mitigate?
FORBES: Tearing away the veil of hype from Palo Alto Networks' IPO
Check Point created the first firewall using "stateful inspection" -- the second-generation of firewall technology widely used today.
Leveraging their existing platform that includes IPS and stateful firewall protections, they have added enhanced DoS defense features.
Stateful inspection specifies the kinds of data packets it will accept or drop.
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In practice, it turns out that stateless models can effectively emulate stateful behavior, for the vast majority of purposes.
Stateful inspection firewalls lost this ability around 2004 when people started building applications that did not adhere to those 1970s guidelines.
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Skype detection has becom a selling point for UTMs and firewalls that go beyond stateful connections and look into actual traffic.
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The truly paranoid may elect to use the 2.4 kernels' Netfilter4 facility (adding stateful packet filtering) or a commercial application-level proxy gateway.
Put another way, modern web-based applications that violate the application guidelines established in the 1970s cannot be controlled by stateful inspection firewalls.
FORBES: Tearing away the veil of hype from Palo Alto Networks' IPO
Stateful inspection offers only two options: Block the apps to mitigate risk exposure, or let them in and hope for the best.
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The problem is that traditional firewall software, like the kind sold by Check Point, Juniper and Cisco, relies on something called stateful inspection.
FORBES: Nir Zuk's Palo Alto Networks Is Blowing Up Internet Security
In the 1990s there was quite the cold war going on in the world of networks between the very idea of stateful and stateless networks.
In technology, a stateful activity or session sets an agreement for all the resources along the path of process flow to be solely assigned for the duration of the activity.
Each node in the flow is aware of the state or context of the session and has agreed or committed to the cause, so to speak, and thus we call it a stateful system.
This says something: even though a stateless network cannot absolutely make guarantees on delivery or completion of its task or even the path it may take, this downside is overcome by the sheer scalability and flexibility of this model over stateful systems.
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