Re: IPv4 flag day

[Arie Vayner via NANOG <nanog () lists nanog org>]

> The list is talking mostly NAT or no NAT, not single or dual stack.
> These are separate discussions, I'm absolutely not saying don't do
> NAT. I'm saying, If you want to do NAPT with your IPv6, go right
> ahead.

The core discussion is that assuming there are use cases that NAT solves,
and the lack of NAT makes hard to solve, the IPv6 community made it hard
for the average SMB sysadmin to deploy IPv6: NAT has been "banned",
standards/BCP docs that mention NAT were not approved, and all the IPV6
best practices docs for IPv6 say "No NAT".

So my take on "If you want to do NAPT with your IPv6, go right ahead", in
the current state, is that it's not practical, and has become a real
blocker for IPv6 ubiquity.

To move IPv6 to the next level of SMB/enterprise adoption we need to make
it easier to consume by the average SMB - which means stop saying "NAT is
evil" or "NAT is not supported in IPv6", and unblock relevant IETF work.

Tnx
Arie



On Thu, Jun 18, 2026 at 11:13 PM Saku Ytti via NANOG <nanog () lists nanog org>
wrote:

> On Fri, 19 Jun 2026 at 09:03, Matthew Petach via NANOG
> <nanog () lists nanog org> wrote:
>
> > So, hopefully people now understand why IPv4 isn't going away, and we can
> > stop talking about a flag day or "shut it down for a day".
> > Nobody wants to cause that level of economic harm for zero benefit.
>
> Short term thinking, the real economic damage of IPv4 is antitrust,
> which far exceeds any economic damage of flag day. Vote for IPv4 is a
> vote for monopolies and a vote against equitability.
>
> The list is talking mostly NAT or no NAT, not single or dual stack.
> These are separate discussions, I'm absolutely not saying don't do
> NAT. I'm saying, If you want to do NAPT with your IPv6, go right
> ahead.
>
> --
>   ++ytti
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>
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