4 ms·Except you need at least a /64 for v6 to properly work.by JustFinishedBSG 3y agoExcept you need at least a /64 for v6 to properly work.ta1243 3y agoYou only need it because that's how the protocol was designed.RedShift1 3y agoYou only need it for SLAAC, and only because SLAAC was made that way.