IPS setup not working

[pre2postinc]

Hi all, I bought a 871 access router that I'm testing out. It's supposed to support IPS, but it says through the SDM that it's not installed. I found the ips.tar file on the CD and copied it in the nvram: directory. I also have the 128MB.spf file on the router. For some reason it was already there, without the ips.tar. Is it supposed to start automatically? Or is there a command to enable IPS? I'm really stumped on this part, I've been looking for a few hours...

Thanks!

[marcabal]

I haven't used the IPS feature in IOS, but I did find this documentation link:

http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804453cf.html

Hope it helps.