In this directory, you can create the following filenames to add custom rules at each section of the firewall script: ipv4_custom_allowedports ipv4_custom_mssclamp ipv4_custom_proto ipv4_custom_blockincoming ipv4_custom_nat ipv4_custom_routing ipv4_custom_blockoutports ipv4_custom_notrack ipv4_custom_flush ipv4_custom_conntrack ipv4_custom_portforward ipv4_custom_trust ipv4_custom_blockip ipv4_custom_mark ipv6_custom_flush ipv6_custom_trust ipv6_custom_mssclamp ipv6_custom_blockoutports ipv6_custom_allowedports ipv6_custom_conntrack ipv6_custom_routing ipv6_custom_blockincoming ipv6_custom_conntrack