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incoming VPN doesn't work with PAT over DHCP

I have an 1841 that uses PAT for outbound traffic.  External Fe0/0 port gets its IP via DHCP. 

ip nat inside source route-map NAT-MAP interface FastEthernet0/0 overload

I have an internal server that runs SSH so I have a port forwarding rule on the router:

ip nat inside source static tcp 172.16.32.3 22 interface FastEthernet0/0 22

Now I added VPN pool, but VPN clients cannot reach the server on port 22. 

The statement below would fix the problem:

ip nat inside source static tcp 172.16.32.3 22 <STATIC IP> 22 route-map NO_NAT-MAP extendable

If I understand correctly this statement is only available for STATIC IPs, in my case I get the IP from DHCP.  Anyone knows a workaround?

thanks!

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