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Re: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 29 October 2018 03:29 UTC

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Subject: Re: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)
To: ipv6@ietf.org
References: <CAFU7BASO_ByzbanhLKnWV280O_fASd-8W+ujpj3sN6d2-whw2w@mail.gmail.com> <0d6008a4-337b-2ccb-2d9f-837f786eca65@gmail.com> <bfa4397a-aa7a-1184-4147-4cbfbfd13603@si6networks.com> <E8DE18B5-94FC-411C-A310-E49A382E0079@thehobsons.co.uk> <e0fa8fad1b4249c9af79788323b0a922@boeing.com> <3A03A073-72E2-43A8-90A4-5C29DF445361@thehobsons.co.uk> <27fdbd71125842d888c5136684bf6e7b@boeing.com> <9A4368D6-E4B1-474C-9838-B584AF6D70C8@thehobsons.co.uk> <a3a2d823c38f44d48b301e2ca657e352@boeing.com> <6EE067A5-3536-4EDD-80D9-D98783DE57CE@thehobsons.co.uk> <0be69133e9a34199b5796410684ab226@boeing.com> <308494108c0b466f91a9314f7d9367bc@boeing.com> <8E339E1C-6AC9-4012-AA63-1A39D64EEDAB@thehobsons.co.uk> <f805c8e5b3dc40a8b8f245f44b7c1c7a@boeing.com> <e421e5ef-137f-bac1-765f-13e6c9107671@gmail.com> <c305e6f01a5349728489cbd53e818ae0@boeing.com> <CAO42Z2wpKpw4dqHU2UCck91qyr9jWnj-h7mQRRkArVH=asbDVw@mail.gmail.com> <b9be753dc3134e3c92eac3c9f773c934@boeing.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Mon, 29 Oct 2018 16:29:26 +1300
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On 2018-10-29 15:08, Manfredi (US), Albert E wrote:
> -----Original Message-----
> From: Mark Smith <markzzzsmith@gmail.com> 
> 
>> You're misunderstanding the mechanism. This flag is not a router
> capability flag.
> 
> Not meant to be, anyway:
> 
>    Hosts receiving the Router Advertisement SHOULD only process this
>    flag if the advertising router is a Default Router.  Specifically, if
>    the Lifetime field in the Router Advertisement is not zero, otherwise
>    it SHOUD be ignored.  This is done to allow some IPv6 routers to
>    advertise information without being a Default Router and providing
>    IPv6 connectivity.
> 
> ....
> 
>    If there are multiple IPv6 default routers on a link, they might send
>    different values of the flag.  If at least one IPv6 default router
>    sends the flag with value 0, a dual stack host SHOULD NOT assume that
>    the link is IPv6-Only.  If all IPv6 default routers send the flag
>    with value 1, a dual stack host SHOULD assume that this is an
>    IPv6-Only link.
> 
>    A host that receives only RAs with the flag set to 1 SHOULD NOT
>    attempt any IPv4 operations, unless it subsequently receives at least
>    one RA with the flag set to zero.  As soon as such an RA is received,
>    IPv4 operations SHOULD be started.
> 
> This seems to say that only when all "default routers" have the flag set, would the link truly be IPv6 only. 

Or rather, only then is the network administrator declaring the link to be IPv6-only.

(And even then, bring your own peripherals should not be precluded?)

That's a policy question. For example, I'm not supposed to plug in
unauthorized devices on the network in my office.

> So in effect, all said and done, does this not say only that *this* router won't route IPv4?

No.

   Brian

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