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Re: IPv4 traffic on "ietf-v6ONLY"

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 17 November 2017 05:14 UTC

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Subject: Re: IPv4 traffic on "ietf-v6ONLY"
To: 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>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 17 Nov 2017 18:14:15 +1300
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On 17/11/2017 17:50, 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's a Windows 7 bug, I'm pretty sure. I think it fails to clear
something when changing to a new SSID but *not* receiving an
address. I reported it at https://tickets.meeting.ietf.org/ticket/1159

   Brian

> 
> 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.
> 
> 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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