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User unable to configure static NAT, receives the % Non-Static entry already exists error message
A static Network Address Translation (NAT) configuration is used for translating a particular local address to a specific global address and the other way around. Dynamic NAT creates translation entries in the NAT table when traffic received from a host matches the criteria specified for translation. Dynamic NAT also translates the address to a different address available in a configured pool.
While attempting to configure static NAT (when dynamic NAT is already configured on the same router), the router may give this error message. This occurs if the address where the translation is being configured is already used by dynamic NAT and the translation entry exists in the table.
To resolve this problem and configure static NAT, perform these steps:
Modify the configured NAT pool to be used by dynamic NAT. This is done by issuing the ip nat pool command from global configuration mode. This ensures that the same address is not used by static as well as dynamic NAT.
The router now allows static NAT to be configured successfully.