fw3 do not call iptables command directly, but call libiptc API, and append API defined here https://git.netfilter.org/iptables/tree/iptables/ip6tables.c?h=v1.8.7#n467 , it require a mask for source IP and dest IP, and the mask is also a valid IP, defined in stdlib, so fw3 need to convert the mask string to a valid IP.
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