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Webcast-Catalyst9k
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Duplicate IPs while using NAT and HSRP

When using two routers in the same HSRP group and the same static NAT table on each, I run into Duplicate IP address messages detected on the interface where the routers are communicating to each other for redundancy.

HSRP is working properly because when I do a show standby one router is active and one is standby.

Any ideas on how to eliminate this problem?

BSC

1 REPLY

Re: Duplicate IPs while using NAT and HSRP

What you need is a feature called Stateful Fail-over of Network Address Translation or SNAT. This feature enables transparent failover of NAT sessions to the standby HSRP router if the primary HSRP device goes down.

The link below should provide the info you need about SNAT.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a008060c61d.html#wp1049970

HTH,

Sundar

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