Bruteforce on my mikrotik

RouterOS General
2

Would need to know first how is this setup.

Depending on your topology, you may block it at Bridge Firewall level, by setting src mac and src mac mask

To match only data from dell devices (for example):

Src MAC Address: 00:1A:A0:00:00:00
Src Mac Mask: FF:FF:FF:00:00:00

This rule will match 00:1A:A0:xx:xx:xx

However I would research first how this person is spoofing macs…