Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard

神明達哉 <jinmei@wide.ad.jp> Fri, 24 February 2017 19:40 UTC

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Date: Fri, 24 Feb 2017 11:40:31 -0800
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Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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At Fri, 24 Feb 2017 15:44:55 +0100,
Alexandre Petrescu <alexandre.petrescu@gmail.com>; wrote:

> >> Help he understand, then. There is widely-deployed code that
> >> assumes that the interface ID is 64 and does not work on anything
> >> other than 64 bit prefix lengths.
> >
> > Out of curiosity: which code is it, and exactly what does its
> > assumption mean?  Does it mean, for example, it allows manual
> > configuration of an address but requires its IID length be 64 bits?
>
> For example - is it normal that when manually adding an address to an
> interface w/o specifying the plen, a /64 'connected' route pops there?
> Why 64?  I dont mind the route, but I mind the 64.

I wouldn't interpret this example as such an implementation "does not
work on anything other than 64 bit prefix lengths" in this context,
since "64" is just the default of the implementation and can be
"operationally" changed.  But in any case, I don't know if this
something what Lorenzo meant.

--
JINMEI, Tatuya