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B2B NAT HA Static NAT ARP Issue

Hello,

We are having trouble testing an HA Scenario with a Static NAT configuration on a pair of Cisco 4351 ISR. A redundancy group has been created, the inside and outside interfaces has been assigned with the redundancy group and the static NAT's with the "redundancy group_number" keyword. The problem we are facing is that the active router doesn't respond to the arp request from the ISP Router neither the standby Router in the active role when we are trying to access the global-ip.

 

Apparently the static NAT in the HA group is configured:

Router_Active#show ip nat translations redundancy 1
Pro Inside global Inside local Outside local Outside global
tcp 10.100.17.63:80 192.168.100.10:80 --- ---
Total number of translations: 1

 

But no ip aliases is created, just the one for the inside:

Router_Active#show ip aliases
Address Type IP Address Port
Interface 10.10.10.1
Interface 10.10.10.5
Interface 10.10.10.9
Interface 10.100.17.61
Interface 10.100.19.112
Dynamic 192.168.100.1
Interface 192.168.100.2

 

Here is the ARP table of the ISP Router the when we are trying to acces the global-IP of the static NAT:

Router_ISP#show ip arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.100.17.63 0 Incomplete ARPA
Router_ISP#

 

And the result of show redundancy of the Active router:

Router_Active#show redundancy application group 1
Group ID:1
Group Name:group1

Administrative State: No Shutdown
Aggregate operational state : Up
My Role: ACTIVE
Peer Role: STANDBY
Peer Presence: Yes
Peer Comm: Yes
Peer Progression Started: Yes

RF Domain: btob-one
RF state: ACTIVE
Peer RF state: STANDBY HOT

Router_Active#

 

We've searched for any possible misconfiguration with no success.

 

The IOS version is Denali 16.3.6 (we also tested the configuration on Denali 16.3.7 with no success) and the config's files are attached in this post.

 

Any advice would be appreciated.

Thanks in advance.

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