Default firewall for RouterOS v6 and v7


/ip firewall nat add chain=srcnat out-interface-list=WAN ipsec-policy=out,none action=masquerade comment="defconf: masquerade"
/ip firewall {
filter add chain=input action=accept connection-state=established,related,untracked comment="defconf: accept established,related,untracked"
filter add chain=input action=drop connection-state=invalid comment="defconf: drop invalid"
filter add chain=input action=accept protocol=icmp comment="defconf: accept ICMP"
filter add chain=input action=accept dst-address=127.0.0.1 comment="defconf: accept to local loopback (for CAPsMAN)"
filter add chain=input action=drop in-interface-list=!LAN comment="defconf: drop all not coming from LAN"
filter add chain=forward action=accept ipsec-policy=in,ipsec comment="defconf: accept in ipsec policy"
filter add chain=forward action=accept ipsec-policy=out,ipsec comment="defconf: accept out ipsec policy"
filter add chain=forward action=fasttrack-connection connection-state=established,related comment="defconf: fasttrack"
filter add chain=forward action=accept connection-state=established,related,untracked comment="defconf: accept established,related, untracked"
filter add chain=forward action=drop connection-state=invalid comment="defconf: drop invalid"
filter add chain=forward action=drop connection-state=new connection-nat-state=!dstnat in-interface-list=WAN comment="defconf: drop all from WAN not DSTNATed"
}

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