Netflow report is not listing any information regarding the NATTED internal IP. It is only listing The public IP address where it is nat overloaded. Is it a limitation with IOS?
which IOS i should use to see netflow from nat traffic
The way that NetFlow is implemented, the flow lookup and creation (NetFlow) stage is performed prior to the feature lookup (NAT) stage on the incoming traffic. Therefore, the NetFlow record will be created prior to NAT and you'll get the external addresses in your flow record. As a workaround, you could possibly try enabling NetFlow on the LAN interface(s) and collect the traffic that's being sent out, there by creating flow records with internal NAT addresses.
Check this out. http://www.netup.biz/articles.php?n=10