[halomru]

>But when you get to their scale, it's hard to make big changes like this in a safe way

Which only makes it more baffling that AWS still doesn't support IPv6 everywhere.

IPv6 is 8 years older than AWS. AWS is a decade old. Given that the inevitability of IPv6 is long known and that it's well known that as a rule changes get more difficult the bigger you get, I would have expected Amazon to start IPv6 deployment much earlier, back when AWS was much smaller.