Re: IPv4 flag day

[Bill Woodcock via NANOG <nanog () lists nanog org>]

Why not filter at internet-AS edges much sooner than that?
    
                -Bill


> On Jun 16, 2026, at 08:35, Saku Ytti via NANOG <nanog () lists nanog org> wrote:
>
> 'ello,
>
> I've babbled about this before, but apparently I'm babbling about it again.
>
> Does anyone feel responsibility for the dual stack mess we've created?
> It wasn't here when we found the Internet, and we're going to leave it
> here after we leave, does not really jive with the whole leave
> campground cleaner than found it ethos.
>
> I don't see any future where organically IPv4 dies in such a way that
> people offering services on the Internet are comfortable offering them
> IPv6 only, the long tail will be too expensive to ignore.
>
> Dual stack adds complexity, cost, reduces quality and security. It is
> also blatantly an antitrust issue, as established players with access
> to large allocations can outcompete new entrants with no IPv4
> allocation.
>
> In practice I'm thinking about something where relevant players all
> sign an agreement to drop ipv4 at their edge in e..g 15 or 20 years.
> Creating clear business justification for people to implement IPv6 in
> their next upgrade cycle. Today if I'm an edge with the IPv4 addresses
> I need, I wouldn't consider IPv6, because that's just a cost to me,
> with no upside.
> I know I could get some transit shops to sign off on such an
> agreement, but no one cares about transit, this obviously doesn't work
> without Amazon and Facebook et.al.
>
> Sure edges still can have IPv4, but that's like edge having IPX or
> AppleTalk, it'll be highly local issue, no one expects to reach
> anywhere with it, and anticipates to translate 100% of external
> traffic.
>
> Amazon? Facebook? Google? Microsoft? Any appetite?
>
> --
>  ++ytti
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