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Re: [v6ops] IPv6 link-local traffic questions

Gert Doering <gert@space.net> Wed, 25 March 2020 06:49 UTC

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Date: Wed, 25 Mar 2020 07:48:55 +0100
From: Gert Doering <gert@space.net>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Owen DeLong <owen@delong.com>, Erik Kline <ek.ietf@gmail.com>, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
Subject: Re: [v6ops] IPv6 link-local traffic questions
Message-ID: <20200325064855.GD50230@Space.Net>
References: <CAFU7BAT-LP5TC9dpYw+5j8T8H_8XMF=tcY-Qsbg5=MOgUYNk+A@mail.gmail.com> <CABNhwV1uCFHCO9r3NK7QeqZ4gvrquoD_534LXoykaf59S48rpA@mail.gmail.com> <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>
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Hi,

On Wed, Mar 25, 2020 at 03:03:45PM +1300, Brian E Carpenter wrote:
> Only if the router violates the spec:
> "  Routers must not forward any packets with Link-Local source or
>    destination addresses to other links." [RFC4291]
> Do we have any evidence of routers that are broken in this way?

Yes.  Last time we checked, Juniper routers just forward(ed) packets based
on destination address, period.

(This was a few years ago, when trying to figure out what to do against
the then-current resource attacks against IOS XR LPTS with "too many ND
packets", so it might have changed in the meantime)

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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