Mtik RB 750G-how to set the filter Interne NAT Redirection?

RouterOS Beginner Basics
1

I have Mikrotik RB 750G on local network 192.168.1.0/24 where the ftp server is on 192.168.1.254. I set port forwarding on port 21 to 192.168.1.254 , for the public address 1.1.1.2 for example. When I access from net on ftp://1.1.1.2 Mtik sends me to FTP server and this is clear.
How to allow local computers to get access to the local server when they try it on public address (ftp://1.1.1.2). This option is available on Linksys as Internet NAT Redirection Filter option or on D-Link as loopback like disable/enable option to block or allow access to local servers for local computer over the public address.

How can I achive this on Mtik?
Thanks…

2
  1. Use local address for the clients;
  2. Use DNS static entry for the local clients, add static entry to /ip dns static, which resolves myftp.com to your address;
  3. Masquerade local traffic too (not only outgoing).