I have a Usecase where an Access Device need to reach a Core Device over the Internet. Access Device is configured with the Public IP of the Core device as of now so that it can reach the Core over the Internet.
However, we want to add another Public Interface via another ISP for Redundancy on the Core Device. The application that resides on the Core Device can only bind to one IP Address which means I have to use a loopback IP Address and have the two Physical Interfaces configured with Public IP1(ISP1) and Public IP2(IP2).
If my Access Device need to access the Application which is bound to a loopback IP, the loopback IP need to be a Public IP as well right? Is it possible to have a Public IP for a Loopback that's reachable via ISP1 and ISP2?