Cisco Cisco IPS 4255 Sensor

maximum of 250 bytes in both directions, that is, 250 bytes to service and 250 bytes from 
service. The service ports option describes the ports for which you do not want to generate 
alerts. Inspection still occurs, but alerts are suppressed for these ports defined per signature.

Service Generic engine—This engine has been enhanced to support TCP stream processing, 
which lets the Cisco signature team provide increased, higher fidelity support for protocol 
analysis signatures when a dedicated engine does not already exist.

Meta engine—The Meta engine now uses an OR operator and nesting, which allows complex 
AND/OR combination to be used in the Meta signature logic.

For more information on the new signature engines, refer to 

Because MySDN has been decommissioned, the URL in older versions of IDM and IME is no longer 
functional. If you are using IPS 6.0 or later, we recommend that you upgrade your version of IDM and 
IME.

You can upgrade to the following versions to get the functioning MySDN URL:

IDM 7.0.3

IME 7.0.3

IPS 7.0(4), which contains IDM 7.0.4

If you are using version IPS 5.x, you must look up signature information manually at this URL:

For information on MySDN (formerly known as NSDB) in IDM, refer to 

This section describes the actions you should take before upgrading to Cisco IPS 6.0(4)E2. It contains 
the following topics: