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Re: IPv4 traffic on "ietf-v6ONLY"

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 17 November 2017 05:31 UTC

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Subject: Re: IPv4 traffic on "ietf-v6ONLY"
To: joel jaeggli <joelja@bogus.com>, Alexandre Petrescu <alexandre.petrescu@gmail.com>, ipv6@ietf.org
References: <f9805855-68cf-a3e8-a13f-c6ac31b09058@gmail.com> <bbd4e1d2-047f-6758-76f8-fd591c51dad7@gmail.com> <D631CE54.8C0F5%lee@asgard.org> <m1eEvEP-0000G3C@stereo.hq.phicoh.net> <D75288D5-B571-46EB-A35E-0DBD79F930E5@google.com> <b05f3549-585f-f834-2df3-3b458f67ba2d@gmail.com> <22f886f2-b2c8-aca5-ad4d-425a119f9ace@bogus.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 17 Nov 2017 18:31:21 +1300
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On 17/11/2017 18:12, joel jaeggli wrote:
> On 11/17/17 12:50, Alexandre Petrescu wrote:
>>
>>
>> Le 15/11/2017 à 20:15, james woodyatt a écrit :
>>> On Nov 15, 2017, at 02:47, Philip Homburg
>>> <pch-ipv6-ietf-4@u-1.phicoh.com
>>> <mailto:pch-ipv6-ietf-4@u-1.phicoh.com>> wrote:
>>>>
>>>> The safest option to do that is a DHCPv4 option that says 'no IPv4
>>>> service here, go away'.
>>>
>>> Better: extend ARP with a signal that says, “ARP is not welcome here."
>>
>> During changes between the 3 SSIDs I noticed often the message "Windows
>> detected an IP address conflict" popped up.  The explanation says that
>> another computer on the network has the same address, contact the
>> sysadmin, and more details are available.
>>
>> This makes wonder whether someone put a computer there that responds to
>> all ARP resolution requests for LLs 169, claiming them all.
>>
>> It happens systematically when changing the ESSID from "ietf" to
>> "ietf-v6ONLY".  If, prior to that change, I disable the IPv4 checkbox in
>> interface Properties, the message does not pop up.
> 
> The arp / broadcast suppression proxy in the wireless controller is
> responding afirmatively to the gratuitous arp that your client sends in
> order to test  that it's auto-configured address is available. Roaming
> rapidly between APs can achieve that. It thinks you're in two places at
> one. sending any other kinda of packet first that would allow it to
> update it's mac address table.

Hang on... that makes sense within a single SSID, but why would the
controller share info between independent SSIDs?

Unfortunately there is no ARP traffic in the captures I made during the
week.

    Brian
> 
>> However, this message appears also when changing attachment from SSID
>> "ietf-v6ONLY" to "ietf".
>>
>> Alex
>>
>>>
>>> --james woodyatt <jhw@google.com <mailto:jhw@google.com>>
>>>
>>>
>>>
>>>
>>>
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>>
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