I have a pair of MX configured in HA routed mode. All 4 uplinks are configured with public IP addresses + 2 public VIP addresses as shown in the below diagram.
I have a few questions:
1. Technically, is it possible to use private IP in this case? I have quite limited knowledge of ISP devices but I suppose that as my home Internet modem, they support DHCP and the MX could be configured with private IP?
MX-1 uplink 1: 192.168.1.1/24
MX-2 uplink 1: 192.168.1.2/24
VIP : 192.168.1.3/24
Default gateway = ISP1 device : 192.168.1.254/24
MX-1 uplink 2: 192.168.2.1/24
MX-2 uplink 2: 192.168.2.2/24
VIP : 192.168.2.3/24
Default gateway = ISP2 device : 192.168.2.254/24
2. If the answer is yes, why do we use public IP ? Is there something we can do with public IP but cannot with private IP?
Thanks a lot for your help.