do anyone use a carrier grade with mikrotik NAT to save public IPs? How?
Which I don't think is easily doable on RouterOS... maybe if you play around with VRFs.... Shared Address Space can be used as additional non-globally routable space on routing equipment that is able to do address translation across router interfaces when the addresses are identical on two different interfaces.
Devices MUST be capable of performing address translation when identical Shared Address Space ranges are used on two different interfaces.