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Re: [**EXTERNAL**] Re: the race to the bottom problem

"Mudric, Dusan" <dmudric@ciena.com> Fri, 06 November 2020 23:08 UTC

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From: "Mudric, Dusan" <dmudric@ciena.com>
To: Bob Hinden <bob.hinden@gmail.com>, Brian Carpenter <brian.e.carpenter@gmail.com>
CC: "Mudric, Dusan" <dmudric=40ciena.com@dmarc.ietf.org>, "draft-mishra-6man-variable-slaac@ietf.org" <draft-mishra-6man-variable-slaac@ietf.org>, IPv6 List <ipv6@ietf.org>
Subject: Re: [**EXTERNAL**] Re: the race to the bottom problem
Thread-Topic: [**EXTERNAL**] Re: the race to the bottom problem
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Date: Fri, 06 Nov 2020 23:08:26 +0000
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The first sentence is taken out of the context. I actually said:

"- There is no race to the bottom. We are not trying to solve ISP problem by allowing longer than 64bit prefixes,
- It is not about restricting the ISP prefix assignments to minimum one 64bit prefix, by imposing 64bit SLAAC prefix limitation on the clients,
- Minimum of one 64bit prefix limitation should be imposed by other network elements, rather than clients. Edge routers can block >64bit prefixes,"

because I believe the race to the bottom can be addressed by other network elements (e.g. CE), not only clients.

Dusan

On 2020-11-06, 5:11 PM, "Bob Hinden" <bob.hinden@gmail.com> wrote:

Brian,

> On Nov 6, 2020, at 12:09 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
> On 07-Nov-20 03:30, Mudric, Dusan wrote:
>> Would it help if the problem statemen clarifies that:
>> 
>> - There is no race to the bottom. We are not trying to solve ISP problem by allowing longer than 64bit prefixes,
> 
> Unfortunately, once you push code allowing >64 subnet prefixes for SLAAC into the wild, you do automatically give ISPs a path to to allocating longer prefixes to customers, and all history tells us that some of them will follow that path.
> 

> Once that code is out there, the race to the bottom is enabled.

I fully agree.   And once it is broken, there is no going back.

Also, I have yet to see any solution to having a mix of devices on the same link that can only support 64bit IIDs and ones that can support shorter IIDs.  I think there is an impossible transition problem.

Lastly and probably the most important, I have not seen a convincing argument why this is necessary.   The risk is breaking IPv6 in a fundamental way.

Bob


> 
> Even draft-bourbaki-6man-classless-ipv6 doesn't recommend changing the /64 default for SLAAC. (If it did, my name would not be on that draft.)
> 
>   Brian
> 
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