Re: IPv4 flag day

["Aaron C. de Bruyn via NANOG" <nanog () lists nanog org>]

On Fri, Jun 19, 2026 at 12:47 PM Marco Moock via NANOG <
nanog () lists nanog org> wrote:

> Am 19.06.26 um 21:21 schrieb Aaron C. de Bruyn:
> > I don't want to renumber everything because I ditch one ISP and switch to
> > another.
>
> Get your own prefix from RIR and let your ISP route it to your. If you
> switch the ISP, let the new ISP route it to you. It is even possible to
> have 2 ISPs that route the same prefix to you - without having you own ASN.

A SMB doesn't have to do that in IPv4 using RFC1918 and NAT.
Pretty sure there's a cost to get a /48 from an RIR and probably costs with
the various ISPs to route to you.

While I'll admit I'm not an IPv6 expert by any means, it doesn't seem like
there's a clean path from:
"I have a stable internal network addressing scheme under IPv4 that's
independent of whatever random ISP I'm using  and it sucks I have to use
NAT, but it's easy" to
"There are enough addresses for everyone to have their own internet, so
I'll come up with my own /48 (or get one for free like I had in IPv4) and
simply 'connect' to my ISP and it works...no NAT and no port forwarding
required...just nice simple firewall rules".

-A
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