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stateful inspection
(redirected from Stateful Packet Inspection)

    Also found in: Acronyms, Wikipedia 0.01 sec.
stateful inspection
A firewall technology that ensures that all inbound packets are the result of an outbound request. Also called "stateful packet inspection" (SPI), it was designed to prevent harmful or unrequested packets from entering the computer. For example, if you click on a link to a Web page, an HTTP request is being made to a specific URL address. All packets coming back from that URL would pass the stateful inspection and be accepted. Every so many minutes, your e-mail program queries the mail server, and returning packets from that server are allowed.

Essential and Problematic
Stateful inspection is the norm and generally a major component in every network firewall and personal firewall. However, stateful inspection causes problems with videoconferencing and VoIP, in which a user outside the network wants to initiate a communication with a user inside the network. Various techniques are used to work around this (see STUN, UPnP and port forwarding). See firewall.
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All WatchGuard Firebox and XTM multifunction firewalls deliver deep packet inspection, stateful packet inspection and proxy-based protection, which creates the foundation for a defense-in-depth security architecture.
AVG chosen by WatchGuard to provide anti-virus protection by Worldwide Computer Products News
However, problems have been reported with some routers that have Stateful Packet Inspection in their firewalls, and sometimes a solution is to turn off SPI.
Vista Wi-Fi -- on and off the net by guardian.co.uk / guardian.co.uk
The impact of UTM solutions on network performance, plus the cost and complexity of current alternatives, has resulted in many organizations still relying on stateful packet inspection security despite its inability to protect against dynamic network threats.
SONICWALL DEBUTS NETWORK SECURITY APPLIANCE by Computer Security Update
 
 
 
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