What is the route recommendation for the inside global/outside local IP address on the NAT box ?
A. A route has to be specified on the NAT configured box for the inside global IP address for features such as NAT-NVI. Similarly, a route should also be specified on the NAT box for the outside local IP address. In this case, any packet from an in to out direction using the outside static rule will require this kind of route. In such scenarios, while providing the route for IG/OL, the next hop IP address should also be configured. If the next hop configuration is missing, this is considered a configuration error and will result in undefined behavior. NVI-NAT is present in the output feature path only. If you have directly connected subnet with NAT-NVI or the outside NAT translation rule configured on the box, then in those scenarios, you need to provide a dummy Next Hop IP address and also an associated ARP for the Next Hop. This is needed for the underlying infrastructure to hand the packet to NAT for the translation.
