Does the IOS Image Support Firewall and IPSec Features?

How do you tell if the IOS on a router supports the firewall or the IPSec features? Cisco and vendors who use Cisco IOS on their devices follow a naming convention for software images. The device IOS convention identifies the platform, the features of the image, and the area of memory used by the image at runtime. For the image c2600-jos56i-mz.120-4 .T.bin, the name is the portion up to the first period and everything else is version/release information. The three components of the name are separated by dashes. In the example,

• The platform is a Cisco 2600 series router.

• The o feature code indicates firewall features. The 56i indicates 56-bit IPSec encryption. The s indicates a group of features, such as NAT, ISL IBM, MMP, VPDN/L2F, VOIP, and ATM. The j indicates enterprise features.

• The m indicates that the software runs from RAM, and the z indicates the image is zipped.

For more information on naming convention and version numbers, go to http://www.cisco.com/warp/public/620/4.html. Naming is in Section 2.2. No CCO account is required to view this document.