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Re: [v6ops] IPv6 link-local traffic questions

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 26 March 2020 19:57 UTC

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Subject: Re: [v6ops] IPv6 link-local traffic questions
To: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>, v6ops@ietf.org
Cc: 6man <6man@ietf.org>, Gert Doering <gert@space.net>
References: <1584173474.2857.102.camel@biplane.com.au> <CABNhwV3VCPmcaGNyf=9dX4vcrsSreRGgkRDh0zQD+VLqG-g63Q@mail.gmail.com> <CABNhwV0D71380ZPWTLHu-LM=sz1OK6aB0du=g7uW-gxLdfGvsg@mail.gmail.com> <CA+wi2hMPk6init=1Q1+S0SzTCzOqSDbMNpsD4rUBB0VEo1BkfA@mail.gmail.com> <CABNhwV3Z=YPvU3=X4WOxF1+JRBMovucOdVDa67g1Tv4Yo7+G+A@mail.gmail.com> <CAMGpriVoOufyFhn8tzYvO5S3jJ5=eJz324=3jPJQmK1MiyPQ2g@mail.gmail.com> <5D374DA6-15B2-47AD-97B4-2BCC120859D1@delong.com> <b34e19a1-0ae4-b419-b7df-2c4a893ac9a3@gmail.com> <20200325064855.GD50230@Space.Net> <55e4ba5d-f7cc-4fc2-dc20-3ac0fd36d46c@gmail.com> <20200325210508.GP50230@Space.Net> <m1jHSUT-0000K3C@stereo.hq.phicoh.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <992ba9ad-bce4-7566-4dc8-5c63ee81a7e2@gmail.com>
Date: Fri, 27 Mar 2020 08:57:00 +1300
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On 27-Mar-20 02:24, Philip Homburg wrote:
> In your letter dated Wed, 25 Mar 2020 22:05:08 +0100 you wrote:
>> Junipers (used to) forward to non-link-local destinations without checking
>> source address.  So they (used to) violate the "Routes must not forward any
>> packets with Link-Local source [...] to other links" part.
>>
>> As I said, this was a few years ago, we had no Juniper routers ourselves
>> back then, and no contacts to get this properly addressed.  It might
>> be fixed by now, or not.  Fairly easy to test, though.
> 
> I just noticed that my ISP is sending me those packets. So yes, this
> behavior is still alive on todays internet.

Words fail me. So it seems that setting the hop limit to 255 and
checking on receipt really is desirable.

   Brian

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