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Re: Forwarding Packets With Link Local Destination Addresses

神明達哉 <jinmei@wide.ad.jp> Thu, 07 January 2021 18:08 UTC

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From: 神明達哉 <jinmei@wide.ad.jp>
Date: Thu, 07 Jan 2021 10:08:38 -0800
Message-ID: <CAJE_bqdYv1uO7fZjG8hvD7Zf=f_TL6zH0bcgxxzxHG1ZkA8XGw@mail.gmail.com>
Subject: Re: Forwarding Packets With Link Local Destination Addresses
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
Cc: "6man@ietf.org" <6man@ietf.org>
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At Thu, 7 Jan 2021 17:53:51 +0000,
Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org> wrote:

> According to RFC 4291, "routers must not forward any packets with Link-Local source or destination addresses to other links".
>
> I interpret this statement to include packets that contain routing headers. For example, it forbids an SRv6 packet whose final segment has a locator that begins with FE80.
>
> Does everyone share this interpretation? If so, do RFC 4291 or RFC 8200 make this sufficiently clear?

I believe Section 9 of RFC4007 answers the question.  In short, you're
*basically* correct.

I said *basically* because there can be an exception that makes it
legitimate, but I suspect that usually doesn't apply in practice.

--
jinmei

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