Static NAT redundancy with HSRP

This approach is used when you want to configure NAT and integrate it with HSRP (enable the same NAT on all the
routers that form the HSRP group). In order to do this, it's necessary to NAME each of the HSRP groups:

Step 1: Name the already configured HSRP group:
(config-if)#standby name HSRP-1 <- HSRP Group Name is HSRP-1

Step 2: Congigure NAT on the relevant interfaces
(config-if)#ip nat inside <- NAT inside interface

Step 3: Static NAT redundancy with HSRP
After you've named the HSRP group, configure the Redundancy NAT:
(config)#ip nat inside source static 10.185.117.1 152.168.13.9 redundancy HSRP-1

This means that the traffic originated from the IP 10.185.117.1 will be NAT-ed into 152.168.13.9

Tests:
In this example the router 10.185.117.1 is pinging the IP 200.1.1.4. The final router (232.32.32.4) does have the route back to 152.168.13.9
When the DEBUG is done on the router, the PING done from 10.185.117.1 gives the following display:
*Nov  7 11:34:02.606: NAT*: s=10.185.117.1->152.168.13.9, d=232.32.32.4 [226]
*Nov  7 11:34:02.606: NAT*: s=232.32.32.4, d=152.168.13.9->10.185.117.1 [226]
*Nov  7 11:34:02.610: NAT*: s=10.185.117.1->152.168.13.9, d=232.32.32.4 [227]
*Nov  7 11:34:04.606: NAT*: s=10.185.117.1->152.168.13.9, d=232.32.32.4 [228]
*Nov  7 11:34:04.606: NAT*: s=232.32.32.4, d=152.168.13.9->10.185.117.1 [228]
*Nov  7 11:34:04.606: NAT*: s=10.185.117.1->152.168.13.9, d=232.32.32.4 [229]
*Nov  7 11:34:04.606: NAT*: s=232.32.32.4, d=152.168.13.9->10.185.117.1 [229]
*Nov  7 11:34:04.610: NAT*: s=10.185.117.1->152.168.13.9, d=232.32.32.4 [230]
*Nov  7 11:34:04.610: NAT*: s=232.32.32.4, d=152.168.13.9->10.185.117.1 [230]