Overloading, or PAT, works only when traffic is initiated on the LAN and
terminating on the WAN.  Then, as you say, a nat translation is created so
packets can go back and forth between the two. WAN traffic can then only hit
the LAN for the duration that the translation remains in the nat table.

If you want to have traffic initated on the WAN to reach your LAN, you need
static NAT in the form of:

ip nat inside source static [local-ip] [global ip].  

This creates a one-to-one mapping between your local ip and the global ip,
not one-to-many as in PAT.

The only other nat option is to use TCP Load Distribution which likely
doesn't apply to your circumstance.

Jason


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