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Re: [v6ops] IPv6 link-local traffic questions

Owen DeLong <owen@delong.com> Wed, 25 March 2020 20:35 UTC

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Subject: Re: [v6ops] IPv6 link-local traffic questions
From: Owen DeLong <owen@delong.com>
In-Reply-To: <55e4ba5d-f7cc-4fc2-dc20-3ac0fd36d46c@gmail.com>
Date: Wed, 25 Mar 2020 13:35:28 -0700
Cc: Gert Doering <gert@space.net>, Erik Kline <ek.ietf@gmail.com>, V6 Ops List <v6ops@ietf.org>, 6man <6man@ietf.org>
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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> On Mar 25, 2020, at 13:21 , Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
> On 25-Mar-20 19:48, Gert Doering wrote:
>> 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.
> 
> I'm curious. Since link-local addresses are, er, link-local, how would
> such a router choose the outgoing interface?
> 

I think that the point of the message is that if the packet has LL Source and non-LL
destination… It could get erroneously forwarded.

Owen

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