I was told recently that it should be no issue that have two MX75 in a HA (passive/ready) configuration with only 1 external IP address.
So I bought two MX75 and started configuring them.
As soon as I add the spare and set it to "MX IP", I rather immediately get a issue where it states that there is a duplicate IP configured and then the two firewalls takes turn on being primary/spare.
Is it so that this can't be done and I have to do it "old style" where each of the MX has there own external IP?
Are there any other options?
For reference I have connected it all as per following drawing: