Mikrotik: Use multiple public IP in single WAN interface

In some cases, there are more than one public IPs given by ISP for users. For example, business packages that are very pricey.

How to configure for each device/interface to get the specific public IP?

Of course, in stock routers given by ISP, they teach us to use Unnumbered IP, which for some reasons are not as easy as using NAT in Mikrotik.

Network Address Translation (NAT).

First, you need to determine that the address are already added inside the IP > Address in Mikrotik. If not, you should do so.

/ip address add address=<public ip here> interface=<wan/pppoe client interface here>
After making sure it is available, go ahead to IP > Firewall > NAT. Add the src-nat and dst-nat translation to your specific network address/interface.

/ip firewall nat
add chain=dst-nat action=dst-nat dst-address=<public ip here> to-address=<local server address>

add chain=src-nat action=src-nat src-address=<local server address> to-address=<public ip here> out-interface=<wan/pppoe client interface here>

If public IP on the server returning wrong/same public IP please check if you already have a masquerade rule that applies to all interface and address. If you do so, add a new rule at the end of ruleset and disable the masquerade rule. This will allow you to select the public IP that is default in the network.

/ip firewall natadd chain=src-nat action=src-nat to-address=<public ip here> out-interface=<wan/pppoe client interface here>