Re: I-D Action: draft-mishra-6man-variable-slaac-01.txt

[Mark Smith <[e-mail]>]

On Mon, 9 Nov 2020, 20:39 JORDI PALET MARTINEZ, <jordi.palet=
[e-mail]> wrote:

> I think there is some performance testing done in ISC KEA, which allows
> distributed DHCPv6 (including PD) servers, HA features, etc. I don't think
> this should be a different problem than the fact that they need to run many
> APNs, authentications servers, billing, DPI, firewalling, etc., for the
> same number of hundreds of millions of customers (in the bigger cases of
> cellular networks).
>

HFC cable networks would have run large scale DHCPv4 for decades now. As an
example of their scale, I remember one if the large US ones wanting IPv6
just for cable modem management, because they'd run out of RFC1918
addresses.

 It's not a new problem.

Regards,
Mark.



> Regards,
> Jordi
> @jordipalet
>
>
>
> El 9/11/20 2:26, "ipv6 en nombre de Brian E Carpenter" <
> [e-mail] en nombre de [e-mail]> escribió:
>
>     On 09-Nov-20 13:00, Ca By wrote:
>     >
>     >
>     > On Fri, Nov 6, 2020 at 1:05 AM <[e-mail] <mailto:
> [e-mail]>> wrote:
>     >
>     >     Cameron,
>     >
>     >     >     Gyan>  This topic has come up many times over the years in
> heated debate and this is another instance of that.  Agreed.  However, what
> makes this instance different is that we have a major problem to be solved
> with 4G  &  now as 5G is rolled out, segmentation is of utmost importance.
> I think in the past we have not had a major problem to be solved and so
> this change being proposed did not gain traction,  but now as 5G becomes
> the "norm" as it will compete directly with broadband that customers will
> start using 5G in SOHO as well as other environments.   This is a major
> issue that has come up with the ramp up for 5G IPv6 only deployments.
>     >     >
>     >     > There is already a solution to this: use DHCPv6 PD on 5G
> networks. It's been supported since 3GPP release 10 several years ago.
>     >     >
>     >     > Has any mobile provider deployed dhcpv6 pd?
>     >     >
>     >     > Perhaps the mobile providers have seen what an operational
> nightmare dhcpv6 pd is and... are like nope.
>     >     >
>     >     > I am in favor of the ietf opening their eyes to a better
> solution.
>     >     >
>     >     > Rfc7278 is universally deployed because it is easy.
>     >     >
>     >     > Can we do better (more /64s) and easy ?
>     >
>     >     It's difficult to design a better solution without understanding
> what "operational nightmares" mean.
>     >     Would you mind elaborating?
>     >
>     >
>     > I believe running a dhcp server supporting 120M mobile subscribers
> would be a nightmare.  I believe dhcpv6 is a larger stateful database and a
> not very forgiving protocol... and client implementations are ...
> heterogeneous. ... and server failover.. messy
>
>     Of course. You would have to run thousands of DHCPv6 servers out in
> the wild. Certainly there would need to be some distributed address pool
> management too. Just handing out a /56 to each PDP context would be so much
> better.
>
>         Brian
>
>     >
>     > None of that exists today in mobile. I feel the effort and scale are
> daunting, so i am not going to do it.
>     >
>     > But, getting a knob in the gateway to set the RA to be 60 (or other)
> instead of 64 would be easy. And, that knob could be constrained to only
> compatible device type (chef’s kisses!)... it can be done
>     >
>     >
>     >
>     >     Best regards,
>     >     Ole
>     >
>     >
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