[v6ops] Re: Dynamic addresses

[Gert Doering <[e-mail]>]

Hi,

On Thu, Aug 15, 2024 at 06:19:58AM +1000, George Michaelson wrote:
> Surely before arguing for constant renumbering you should explain
> remediation for the downsides of constant renumbering?
[..]
> Normally I find I agree easily with what you say. I think you are hand
> waving consequences on your own experience with stable addresses as a norm.
> If you have active solutions and live behind a dynamically addressed sub
> prefix of some other delegate it would be useful to share how you make
> inbound ssh work reliably.

I do have a static v6 network at home, which has been static for 
roughly 23 years - so I see the consequences of assuming "addresses
are static", like "addresses are being put into config files all
over the world".  Should I ever cease working for this very ISP, it
will take me months to get my network back into a working shape...

Thus, not assuming stable addresses, and ensuring software copes better
with change, and more automatic, will cause less pain in the long run.

Now, of course I ssh home - from a few bastion hosts, because firewalling,
and I do not expose my home network to "the world".  Making the DNS
involved more dynamic would certainly be doable, but I am lazy.

But, what you and I do, with SSH, is really of no relevance for the 
Internet at large.  99.99% of the end users out there do not know 
what SSH is, or why they would want a stable address - they use devices
that seamlessly roam between wifi and LTE networks, keeping "connections"
active, and all that - whether it's MPTCP underneath, some sort of
VPN that can handle roaming endpoints, or just very short HTTP sessions,
why would they care?  "Spotify keeps streaming when I leave home",
this is a relevant metric.

(This is part of the larger discussion about IPv6 PI, of course, and
why it does not make sense to give every barbershop wifi a PI /48,
visible in global routing - because it does not work, and is not 
*needed* either)


... I do have customer networks that are connected to other ISPs, with
dynamic and semi-static /56s, and I use an Android phone as LTE hotspot
with always-changing /64 on the wifi, so I *do* see where it hurts, 
and where it doesn't.   My Mac Laptop assigning itself a new privacy
address when it roams between "living room" and "office space" wifi
APs - because they have different SSIDs and it assumes "different network,
then" - *this* is breaking my SSH sessions many times a day.  Which is
annoying, because I have to press the hotkey for "please restore my SSH
sessions to the standard set of hosts and reattach screens there"...

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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