At RB with public IP you can use IP>Cloud (MikroTik DDNS), scripts who check your public IP and do some external action.
At RB without Public IP (client vpn) just set a target to DNS name directed to RB with Public IP.
At RB with public IP you can use IP>Cloud (MikroTik DDNS), scripts who check your public IP and do some external action.
At RB without Public IP (client vpn) just set a target to DNS name directed to RB with Public IP.