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After another power-cycle there is no longer an IPV6 address although I'm not sure the Network Status display is helpful. I think we can consider this closed now.
F2-425 Plus, 16GB RAM, 2 x 500GB WD SN700 EXT4 RAID1, 2 x 18TB WD Red Pro EXT4 RAID1, TOS 7.0.<latest>