HA with one Static IP

[manf0001]

Hello,

I came across a setup with two Fortinet routers, setup as an HA - seemed straight forward, Internet to a small switch - then each of the foritnets into that switch, and two heartbeat connections between the two routers. Then to the internal switch

However at this location they only have One External Static IP, and from what I've read - or at least how I understand it, when setting up two routers in HA, we need at least three external static IPs.  One to each router, and a virtual one.  So I'm wondering can I set up two opnsense devices (same hardware) in HA mode with one static IP similar to the described above or do I need three?

Thanks


Thanks

[mimugmail]

Yes, but you cant really use local services as you have to assign Public IPs to them. Depends on the service