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Cisco Bug: CSCus37128 - B2B NAT HA//Error %IP-4-DUPADDR: Duplicate address//NAT is active

Last Modified

May 31, 2018

Products (96)

  • Cisco IOS
  • Cisco 892W Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 861W Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco C892FSP Integrated Services Router
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Known Affected Releases


Description (partial)

Error message : %IP-4-DUPADDR: Duplicate address seen when there is Active NAT translation.

B2B HA NAT Implemented.

Related Community Discussions

HA NAT and %IP-4-DUPADDR: Duplicate address messages
Are the messages %IP-4-DUPADDR: Duplicate address expected with HA NAT?    With Stateful NAT they were seen if the "redundancy GROUP_NAME" was not added to the static NAT.    I am seeing them with a correctly configured HA NAT Box to Box set up and there does not seem to be anything missing that will stop the messages.    Is this a bug?  Should the duplicate IP messages have been suppressed?
Latest activity: Mar 11, 2015
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