ip nat inside source - changes sources addrss of pkts from inside to outside. (or destination address of packets going from outside to inside)
ip nat outside source - changes destination address of pkts going from inside to outside. ( or source add of pkts going from outside to inside)
ip nat inside destination - Usually used in Round robin loadbalancing (TCP load balancing with NAT). Once you configure this command, it can used tochange the destinationa address of pkts coming from outside to inside, and map it on a round robin basis to one of the local private address.
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus