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Re: Forwarding Packets With Link Local Destination Addresses

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 07 January 2021 20:02 UTC

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Subject: Re: Forwarding Packets With Link Local Destination Addresses
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "6man@ietf.org" <6man@ietf.org>
References: <DM6PR05MB6348A18046C5DDC7CF2AED76AEAF0@DM6PR05MB6348.namprd05.prod.outlook.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <13fc3aa3-458f-42e8-0fac-f2448a5beab3@gmail.com>
Date: Fri, 08 Jan 2021 09:01:43 +1300
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Ron,

On 08-Jan-21 06:53, Ron Bonica wrote:
> Folks,
>  
> 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.

As the discussion shows, you really should write "a locator that matches fe80::/10". With that fix:
 
> Does everyone share this interpretation? If so, do RFC 4291 or RFC 8200 make this sufficiently clear?

Yes, and the ensuing discussion about the metaphysics of scope is irrelevant.

    Brian

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