AWS and IPv6

Sun Nov 28 23:55:16 UTC 2021

On 11/28/21 3:50 PM, Matt Palmer wrote:
> On Sun, Nov 28, 2021 at 02:10:40PM -0800, William Herrin wrote:
>> On Sun, Nov 28, 2021 at 1:18 PM Karl Auer <kauer at biplane.com.au> wrote:
>>> On Sun, 2021-11-28 at 12:53 -0800, Michael Thomas wrote:
>>>> I was reading their howto yesterday and it seems they are only
>>>> allocating a /64? Why?
>>> That's a /64 *per subnet*...
>>>
>>> But the size of a VPC's IPv6 CIDR block does seem to be fixed at /56.
>>> Would have been nice to see /48 instead.
>> To what purpose? You can't alter the VPC routing of any of the IP
>> addresses (v4 or v6) assigned to an AWS VPC.
> Which is, fundamentally, half the problem with IPv6 in AWS.  I'd have much
> preferred that they'd added the ability to do actually-useful IPv6 routing
> rather than IPv6-only subnets, which strikes me as more of a toy than
> something *actually* useful.
>
Maybe they're future proofing themselves until they can figure out how 
to put a meter on it for more $$$?

Mike