filter / automatic IPv6 rules, add RFC4890 as suggested by @shonjir for https://github.com/opnsense/core/issues/4565
filter / automatic IPv6 rules, add RFC4890 as suggested by @shonjir for https://github.com/opnsense/core/issues/4565

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core