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Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Ted Lemon <mellon@fugue.com> Mon, 09 December 2019 14:58 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Mon, 09 Dec 2019 06:58:15 -0800
In-Reply-To: <F5AAD5B7-22BD-4474-9A1E-1A97AFFE47FC@cisco.com>
Cc: Lorenzo Colitti <lorenzo@google.com>, V6 Ops List <v6ops@ietf.org>
To: "Bernie Volz (volz)" <volz@cisco.com>
References: <9102C9A8-DA3A-4460-88AD-13E24561B901@cisco.com> <CDC50564-D289-4E73-9924-4F00E93F9C7C@fugue.com> <F5AAD5B7-22BD-4474-9A1E-1A97AFFE47FC@cisco.com>
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Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
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On Dec 9, 2019, at 6:31 AM, Bernie Volz (volz) <volz@cisco.com> wrote:
> No, I am strongly arguing for no change.

Yes, but why?

My concern here is for the end state in ten years.   In ten years, it should be the case that virtually every client supports this feature, and virtually every network offers it.  We don’t want there to be a DHCPv4 server on this network at all.   What we want is a dumb little thing sitting in the router on the link that, when it gets a DHCPDISCOVER, immediately responds with a directive to use IPv6.   So I want to optimize for what that little stub should look like, /not/ what your solution should look like now.

I think it’s pretty clear that that little stub should not offer an IPv4 address at all.  What is the utility of offering one?   We’ve seen several proposed hacks for this, but they are just that: hacks.  They are additional complexity we don’t need.

So that leads me to want you to think really hard about why you want to do something else, and not just strongly argue for no change.   Would you mind doing that?  It’s quite possible that there is some problem with what I’m proposing that you haven’t yet articulated, because you’re satisfied by the superficial answer.  It would be nice to figure out why, for example, the compromise I proposed is unacceptable to you.  What is bad about that solution?  You could, if you chose, make no changes to your server forever, and I could implement my trivial stub in the router, and I think we’d both be happy.

Why do you think we wouldn’t both be happy?

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