maximum ipv4 bgp prefix length of /24 ?

Wed Oct 4 10:11:28 UTC 2023

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
2. Moving to IPv6 a protocol that has been here for 20+ years

???

On Wed, 4 Oct 2023 at 12:41, William Herrin <bill at herrin.us> wrote:

> On Tue, Oct 3, 2023 at 11:56 AM Justin Wilson (Lists) <lists at mtin.net>
> wrote:
> > I think it is going to have to happen.  We have several folks on the IX
> and various consulting clients who only need 3-6 Ips but have to burn a
> full /24 to participate in BGP. I wrote a blog post awhile back on this
> topic
>
> Hi Justin,
>
> The Internet is not one network, it's tens of thousands of them all
> run by different people who make their own choices. To participate in
> BGP with a more specific prefix than /24, you must convince nearly all
> of them to allow it. How are you planning to reach a human being at
> those networks, much less a human being in a position to make that
> choice? Let alone talk them into the change...
>
> When it was a handful of networks trying to filter at /19, it was
> possible to beat that handful over the head. Even then it took years
> before they gave up on the idea. /24 has been the de facto minimum
> since forever. It's not a handful of networks, it's nearly everybody.
>
> So, if you'd like to make a wager on /25 and more specifics becoming a
> real thing on the backbone, I'll be happy to take your money.
>
> Regards,
> Bill Herrin
>
>
> --
> William Herrin
> bill at herrin.us
> https://bill.herrin.us/
>
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