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This is not possible. The failover setup requires to have the exact same hardware in order to function. This includes model, memory, license, interfaces, etc. This setup won't pass the HW check
You can only assign one IP address per ASA interface. However, you can create static NAT translations to have the firewall ARP for several IPs.For example you have the interface with IP address 254.16.220.10, you want to NAT the 254.16.220.15 to an i...