Базовые правила Firewall Mikrotik, например для импорта на CHR.
Чтобы правила сработали в системе надо сначала сделать WAN и LAN интерфейс листы, добавив в них нужные интерфейсы.
/ip firewall filter add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid add action=accept chain=input comment="defconf: accept ICMP" protocol=icmp add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN add action=accept chain=forward comment="defconf: accept in ipsec policy" ipsec-policy=in,ipsec add action=accept chain=forward comment="defconf: accept out ipsec policy" ipsec-policy=out,ipsec add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related add action=accept chain=forward comment="defconf: accept established,related, untracked" connection-state=established,related,untracked add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new in-interface-list=WAN /ip firewall nat add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN