Been resisting adding to this thread...

But if the assumption is that networks will always eventually totally deaggregate to the maximum, we're screwed. Routing IPv4 /32s would be nothing. The current practice of accepting /48s could swell to about 2^(48 - 3) = 2^45 = 35184372088832.

What will prevent unrestricted growth of the IPv6 table if operators push everything out to /48 "to counter hijacks" or other misguided reasons?

On Wed, Oct 4, 2023 at 8:14 AM Owen DeLong via NANOG <nanog@nanog.org> wrote:

If you maximally disaggregate to /24, you end up with about 12M fib entries. At /25 this doubles and you double it again for every bit you move right.

At /24, we are on borrowed time without walking right. Also, the CPU in most routers won’t handle the churn of a 10M prefix RIB.

Owen

> On Oct 4, 2023, at 03:15, Mark Tinka <mark@tinka.africa> wrote:
>
>
>
>> On 10/4/23 12:11, Musa Stephen Honlue wrote:
>>
>> Which one is easier,
>>
>> 1. Convincing the tens of thousands of network operators and equipment vendors to modify configs and code to accept more specifics than /24, or
>
> Equipment vendors can already support 10 million entries in FIB. They just ask for a little bit of cash for it.
>
> Mark.