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Explain SPI (Stateful packet inspection) firewall)

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Explain SPI (Stateful packet inspection) firewall)

Can someone explain how SPI (Stateful packet inspection) firewall works and what are the benfits?

Do you need to run a software firewall if you have a router with SPI (DG834G)?

Thanks
3 REPLIES
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Explain SPI (Stateful packet inspection) firewall)

The following will hopefully answer your first Q (Hint... all found with a google search)

http://www.webopedia.com/TERM/S/stateful_inspection.html

http://www.firewall-software.com/firewall_tech/stateful_packet_inspection.html

http://www.firewalls.com/document-stateful-packet-inspection.asp

http://www.smc.com/index.cfm?sec=Support&pg=Glossary&site=c&term=Stateful%20packet%20inspection

For your 2nd Q, it's entirely up to you. I still run ZonaAlarn even though my router has a hardware firewall. Like most things I prefer to double/triple protect my system to reduce the likelyhood of one failing for some reason.

Also a SPI firewall is only as good as the person who configured it. If the configuration is flawed, having a 2nd layer (software firewall) is a bonus.

The only drawback may be conflicts between the two firewalls and having to configure 2 sets of firewall rules etc to allow games and other apps through but I have ot found that to be a problem I could not resolve yet.
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Explain SPI (Stateful packet inspection) firewall)

Thanks for your replies.

I wasn't being lazy, just looking a layman explanation.

After reading your links I think having a software firewall also is a good idea.
It would let me have some control over individual programs etc.

Cheers
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Explain SPI (Stateful packet inspection) firewall)

As you say, a software firewall will give you control of outgoing connection attempts, such as may happen with a virus.
An SPI firewall will not stop packets getting back to the PC if the connection has been instigated by a virus or malware programme on your PC. A Software firewall will alert you to this.