I would like use ip inspect feature on my router but with my actual release is not possible, when I check on cisco.com there is only ED or LD, I think LD is better, which release you advice me. Thanks in advance.
ED or LD is not the question here. You will need a different feature set.
I assume that you now have ip-base, this must be upgraded to AdvancedSecurity or Enterprise Services. The link below has additional info on IOS releases:
