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Re: [Int-area] I-D Action: draft-herbert-ipv4-udpencap-eh-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 05 March 2019 19:37 UTC

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To: Tom Herbert <tom@herbertland.com>, Stewart Bryant <stewart.bryant@gmail.com>
Cc: int-area <int-area@ietf.org>
References: <155129875566.13940.2872169346710477964@ietfa.amsl.com> <946a3fea-79e7-893c-3b2c-f54fa634339b@gmail.com> <7a537e2a-389f-6e94-996a-404e3cee56e0@gmail.com> <CALx6S35zqB_WPv9OWkLYbpCV_r=Wb4fpjFnLkbcDMY3D7YQNDg@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Wed, 06 Mar 2019 08:37:33 +1300
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Subject: Re: [Int-area] I-D Action: draft-herbert-ipv4-udpencap-eh-00.txt
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On 06-Mar-19 04:55, Tom Herbert wrote:
> On Tue, Mar 5, 2019 at 2:30 AM Stewart Bryant <stewart.bryant@gmail.com> wrote:
>>
>>
>> On 05/03/2019 01:37, Brian E Carpenter wrote:
>>> Hi,
>>>
>>> This is an interesting draft, but I must say I have serious doubts about
>>> the IETF working on any significant update to IPv4 at the IP header level,
>>> or of any such updates ever making it into the operational network.
>>
>> This is something that worries me, in that the IETF seems to be
>> deserting the IPv4 market sector before it is clear that the market is
>> fully committed to an IPv6 only world.
>>
> Stewart,
> 
> I agree. It's clear that IPv4 isn't going away any time soon (e.g.
> https://www.internetgovernance.org/2019/01/04/is-there-hope-for-ipv6/).
> Bringing beneficial features into IPv4 from Ipv6, like the
> aforemention extension headers, could promote uniformity between the
> versions and might help to facilitate transition to IPv6.

Well, I worded my comment quite carefully. IPv4 will fade out over many
years, and any attempt to actively kill it would backfire. But that
doesn't mean that the intensively conservative enterprise network
operators will rush to enable new features. Rather the opposite, in
fact. That's why I give the UDP encapsulation approach a much better
chance of success, whether the carrier is IPv6 or IPv4.

   Brian

> 
> Tom
> 
>> Certainly a lot of enterprise networks and SP cores are still IPv4 only
>> with no apparent intention to shift in the near future.
>>
>> Markets and standards, like nature, abhor a vacuum, and if we do not
>> continue to serve the IPv4 needs some other (quasi) SDO will appear in
>> support of users with requirements and vendors that never leave money on
>> the table.
>>
>> - Stewart
>>
>>
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