Two public ip addressis different mac address for each

Dear experts.

My internet provider requires different mac address for every public static ip address because this address is reserved by their DHCP using mac address.

I don’t know how to solve this using winbox. I have already set nat rules for port forwarding but now I have to specify a rule using different public ip => I need the second public ip working.

I think it has to do something with interfaces, but I don’t know what should be specified.

Thank you very much for any help.

Tom

This solution by @Sob still seems to be the only one.