Re: Objection to draft-ietf-6man-rfc4291bis-07.txt

神明達哉 <jinmei@wide.ad.jp> Fri, 03 March 2017 02:24 UTC

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Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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On Tue, Feb 28, 2017 at 4:04 AM, Alexandre Petrescu
<alexandre.petrescu@gmail.com>; wrote:

> Finally, there is no advice of what bits to put between fe80:: and a
> 64bit the Interface ID - zeros or ones?  linux says it's a fe80::/64 and
> IIRC BSD says it's a fe80::/10.  The routing entries based on that can
> make for interop problems.

I don't know exactly what you mean by "BSD says it's a fe80::/10", but
BSD variants use a 64-bit IID to configure (e.g) an ethernet interface
with a link-local address, as specified in RFC4862 and RFC2464.  They
also only recognize addresses that match fe80::/64 as on-link:

Destination                       Gateway                       Flags      Netif
fe80::%em0/64                     link#1                        U           em0

On the other hand, BSDs' implementation of the IN6_IS_ADDR_LINKLOCAL()
macro only checks the first 10 bits:

#define IN6_IS_ADDR_LINKLOCAL(a)        \
        (((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))

If you mean this by "fe80::/10", yes, BSDs hardcorde /10 for
link-local.  But it has nothing to do with the length of IIDs.

--
JINMEI, Tatuya