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HSRP with Static NAT


we had a NAT router deployed on our network for insdide server to access from outside

To have hardware redunancy we planned to deploy the HSRP between the existing and the new router

but i heard that HSRP and NAT will not work together so i refered some cisco document and its says we can configure HSRP with static NAT

when i tried in my router there is no command as same

Cisco commands:

interface BVI10

ip address

no ip redirects

ip nat inside

standby 10 priority 105 preempt

standby 10 name HSRP1

standby 10 ip

standby 10 track Ethernet2/1



ip default-gateway

when i try on my router its says invalid input

RTR_GSL2-2(config)#$de source static redundancy HSRP1

ip nat inside source static redundancy HSRP1


% Invalid input detected at '^' marker.

can anyone suggest

router A :

System image file is "flash:c3640-i-mz.122-46a.bin"

IOS (tm) 3600 Software (C3640-I-M), Version 12.2(46a), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2007 by cisco Systems, Inc.

Router B:

System image file is "flash:c3640-is-mz.122-5.bin"

IOS (tm) 3600 Software (C3640-IS-M), Version 12.2(5), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2001 by cisco Systems, Inc.

Hall of Fame Super Silver

Re: HSRP with Static NAT

Hello Vinoth,

I see the two routers have different IOS images.

is the command supported on the one with the newer image?.

In release 12.4 (but I don't know if you can install it on your C3640) there is stateful NAT that is more advanced feature available now.

With stateful NAT the two devices keep an updated NAT translation table so that if second router has to take active role it is ready to process current flows.

the feature you are trying to use is older and should miss this capability to exchange state information.

for stateful NAT see

Hope to help


New Member

Re: HSRP with Static NAT

Thanks for your reply

I have upgraded the IOS and configured the NAT with the HSRP

everything looks fine and also standby state but

when i connect with the LIVE the NAT which i applied to the Secondary IP of the outside interface working fine

but not the NAT deployed to the Primary IP

can u suggest us any issue config

when i try to check the arp entry in the backbone router its shows the different mac ID

and also when i roll back the config without the HSRP its working fine