You would need a different features of th IOS on your router.
Here is the the URL with all the details (you will need CCO login):
http://www.cisco.com/warp/customer/432/features.html
Perhaps you will need more RAM as well. Use IOS uprade planer on TAC to
learn the upgrade path. You can download the software from there as well.
I think your IOS must have letter "o" in order to support firewall.
Cheers
Igor Glavanic
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