mac filtering!!!!

ello guys
i have this problem …and seems i can get any answer …
i have 20 pc’s in my network
have only static ip’s
10.11.12.1-10.11.12.200
on this 20 pc’s everything is ok but i dont wanna noone else to join my network
becose i have static ips only till 10.11.12.20 so every one who knows one of my ips can easy join my network by using one similar ip
ex 10.11.12.100 and hes on the internet
so i was thinking maybe some mac filtering or someting…just network adapter whitch i alow to conect or something
if some1 knows how to do that pls answer me
thank u

Set the interface’s arp mode to “reply-only” and define the ARP-IP relations manually (“/ip arp”).
Then only the configured devices can be active with the configured ip addresses.

Does that help?

Best regards,
Christian Meis