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[v6ops] Re: Dynamic addresses

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 12 August 2024 23:45 UTC

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Date: Tue, 13 Aug 2024 11:45:24 +1200
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To: Tim Chown <Tim.Chown@jisc.ac.uk>, Marco Moock <mm@dorfdsl.de>, "v6ops@ietf.org" <v6ops@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: [v6ops] Re: Dynamic addresses
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On 13-Aug-24 00:38, Tim Chown wrote:
> Hi,
> 
> *From: *Marco Moock <mm@dorfdsl.de>
> *Date: *Monday, 12 August 2024 at 13:29
> *To: *v6ops@ietf.org <v6ops@ietf.org>
> *Subject: *[v6ops] Re: Dynamic addresses
> 
> Am Mon, 12 Aug 2024 08:30:44 +0000
> schrieb Tim Chown <Tim.Chown=40jisc.ac.uk@dmarc.ietf.org>:
> 
>> But I don't understand the statement "breaks SLAAC on the LAN". A
>> change of prefix renumbers the LAN, but that doesn't break SLAAC, it
>> just causes SLAAC to renumber everything. It will only break active
>> sessions.
> 
> There are some bullcrap routers issued by ISPs that give the prefix a
> lifetime of forever. That means a computer will keep that address until
> it is being restarted or the NIC is being disconnected.
> 
> Such a case has been discussed in the Usenet some months ago.
> 
> You’ve quoted me, but I didn’t say, that, please be careful  when replying :)


[Indeed, those were my (Brian's) words. Why the email people haven't defined
a robust standard for quoted text in html email beats me. It's the main reason
I send plaintext mail whenever possible.]

In answer to Marco, yes, that's an operational error but it doesn't "break
SLAAC". That's an unhelpful phrase because SLAAC is actually working as
specified.

If we wanted to *change* SLAAC, for example by forbidding prefix lifetimes
greater than N seconds, that's an option we could discuss over in 6man.

    Brian


> 
> Tim
> 
> 
> 
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