Aaarrgggg: has to read ::ffff:ip-v4-address and ::ip-v4-address, not ff:ff::ip-v4-address and 0::ip-v4-address!
Aaarrgggg: has to read ::ffff: ip-v4-address and ::ip-v4-address, not ff:ff:: ip-v4-address and 0::ip-v4-address!