How can the FWSM be used to provide VRF-aware NAT?
A. Neither the 6500 nor the 7600 feature VRF-aware NAT. The FWSM is frequently suggested as an alternative, because it’s very easy to insert it inside a VRF and because it provides NAT on a per-VFW basis. Please refer to this doc for examples. See the scalability section for information about limits.