When should application-layer protection technologies replace IPS?

What are the application layer protection technologies such as deep packet inspection or SmartDefense? When should these be pitched to a customer as a replacement for an intrusion prevention system (IPS)?

Application layer protection technologies have recently been introduced into network firewalls to block attacks such as buffer overflows and SQL injection. While providing some of the same functionality as a pure-play intrusion prevention system, this added protection comes at a significant loss in firewall performance. Overall, application layer protection is a less expensive way to protect against common attacks, but care must be taken to ensure that firewalls can handle the added load.

This was first published in November 2007

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