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From everything we learned so far, let's try to build an advanced firewall. In this firewall building example, we will try to use as many firewall features as we can to illustrate how they work and when they should be used the right way.
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/ip firewall filter add action=accept chain=forward comment="defconf: accept all that matches IPSec policy" ipsec-policy=in,ipsec disabled=yes 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 add action=drop chain=forward src-address-list=no_forward_ipv4 comment="defconf: drop bad forward IPs" add action=drop chain=forward dst-address-list=no_forward_ipv4 comment="defconf: drop bad forward IPs" |
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