Cisco Systems releases IOS Intrusion Prevention System (IPS) signatures in the form of "S-files", which are lists of signatures and their characteristics. Cisco S-files contain signatures for all Cisco IPS platforms: Cisco IPS 42xx sensors, Cisco ASA 55xx appliances, Intrusion Detection System (IDS) modules for Cisco Catalyst 6500 Series switches, and Cisco IOS IPS. As Cisco creates new signatures, it updates the S-files and increments the file name (e.g. S224 as of April 2006). Cisco IOS IPS supports most, but not all, of the signatures in the S-files. This is because the other platforms (e.g. 42xx sensors) support additional "IPS inspection engines" that Cisco IOS IPS currently does not.
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