Resolution
Prior to this feature, when the primary Hot Standby Router Protocol (HSRP) router failed, the Network Address Translation (NAT) would not work on the secondary HSRP router. This is because the Address Resolution Protocol (ARP) entries would not be updated.
To enable static NAT with HSRP support, issue the ip nat inside source static command with the redundancy keyword. This allows for high availability.
For more information, refer to the
Enabling Static NAT in an HSRP Environment section of NAT: Static Mapping Support with HSRP for High Availability
Configuring NAT for High Availability
