I’m new here. I applied the filter rules from http://tksja.com/essential-firewall-rules/ after that my PC connection not stable the speed keeps dropping.
and who made you do to take some pieces at random and put them in the router?
reload backup
oh, no backup?
this is the counter-script
/ip firewall address-list
remove [find where list=Bogons]
/ip firewall filter
remove [find where action=accept chain=input port=69 protocol=udp]
remove [find where action=accept chain=forward port=69 protocol=udp]
remove [find where action=drop chain=forward connection-nat-state=!dstnat connection-state=new in-interface=ether1]
remove [find where action=drop chain=forward dst-address-list=Bogons]
remove [find where action=drop chain=input in-interface=ether1]
Kevintkv, if your network does not have specific requirements, then the configuration that appears on the site will suffice for you.
https://www.manitonetworks.com/mikrotik/2016/5/22/mikrotik-fasttrack-firewall-rules