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Re: ICMPv6 question

Mark Andrews <marka@isc.org> Fri, 01 September 2017 23:18 UTC

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To: james woodyatt <jhw@google.com>
Cc: Mark Smith <markzzzsmith@gmail.com>, 6man WG <ipv6@ietf.org>
From: Mark Andrews <marka@isc.org>
References: <952aab1a2c824a79b98a3f9d2b3a473a@XCH15-06-08.nw.nos.boeing.com> <CAO42Z2xYD-aQAQjFFFh2=iqF42izQw30NnTLPWAvpivFBGPkpg@mail.gmail.com> <6163BB50-8822-4C10-A48D-7030BD3BD67E@google.com>
Subject: Re: ICMPv6 question
In-reply-to: Your message of "Fri, 01 Sep 2017 10:34:05 -0700." <6163BB50-8822-4C10-A48D-7030BD3BD67E@google.com>
Date: Sat, 02 Sep 2017 09:18:41 +1000
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In message <6163BB50-8822-4C10-A48D-7030BD3BD67E@google.com>, james woodyatt wr
ites:
>
> On Aug 31, 2017, at 17:26, Mark Smith <markzzzsmith@gmail.com> wrote:
> >
> > I was wondering about how this could happen and I think there could be
> two possible causes,
> >
> > - incorrect ND cache entry for 2001:db8::baa2001:db8::baa […]
> > - host attached to one end of a point-to-point link […]
>
> A third case, which isn’t an error or failure mode:
>
> - transmitter is not yet unaware that receiver has transitioned from
> router to host.

Fourth case, which also isn't a error or failure mode:

permiscious mode is turned on in the interface

I've needed to do that to get around the limited/broken multicast support
at the chip level.  Ended up filtering out the packets that should have
been dropped by the chip in the firewall.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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