MikroTik DHCPv6 client script to update firewall address-lists

dhcpv6-firewall.rsc

# DHCPv6 script to create firewall address-lists for the parent and the delegated network
#
# Preparation:
#    /ipv6 firewall address-list add list=delegated_net
#    /ipv6 firewall address-list add list=parent_net
#
# change the prefix of your parent network:
:local parentPrefix 59

:global stripNetmask do={ :return ([:toip6 [:pick $1 0 [:find $1 "/"]]]); }

:if ($"pd-valid" = 1) do={ 
   :local lanNetPrefix $"pd-prefix"
   :local lanNet [$stripNetmask $"pd-prefix"]
   # get bitmask for parent network, work around lack of dynamic ip6-prefix creation
   :local parentBitmask [[:parse ":return ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/$parentPrefix"]]
   :local parentNet ($lanNet & [$stripNetmask $parentBitmask]);
   :log info "Got $lanNetPrefix delegation from $parentNet/$parentPrefix";
   /ipv6/firewall/address-list/set [ find list=parent_net ] address="$parentNet/$parentPrefix"
   /ipv6/firewall/address-list/set [ find list=delegated_net ] address="$lanNetPrefix"
}