NAT question for stretched external IP and different internal IP

[takhtar]

The setup is 2 data centers with 2 sets of PANs (5060).  An AS is stretched between the 2 data centers /24 primary in each data center, so if one ISP fails /24 block will enter the other data center.  Normally for just internet failures internal IP is preserved.  When a data center outage occurs, internal IP are changed.  How do you configure NAT in the PANs to reflect a internal IP changes for DR situations?

Thanks

[santonic]

Use Dynamic IP and port with Address type 'Interface Address', (Inerface setting with correct interface selected) and IP address valuse set as none.

[santonic]

Tho if you have PI public address network just use PI address for NAT?

[takhtar]

Not sure if I explained my situation correctly.

There are 2 data centers with 10G link between.  There is an external AS with /24 primary at each data center, when internet failure occurs, the /24 gets routed at other site.

A pair of PANs at each DC.  NAT takes place at each location for say 12.12.12.12 to internal IP 10.12.12.12, which is primarily at DC1.

During a complete DC 1 failure, server 10.12.12.12 moves over to DC 2 and has IP 10.112.112.112.  We would like to continue to use the 12.12.12.12 as it is now routed to DC2.

We want both NATs in the FW at DC 2 for an automated failover process.