[Srcomp] FW: Forwarding Packets With Link Local Destination Addresses

Ron Bonica <rbonica@juniper.net> Thu, 07 January 2021 18:25 UTC

From: Ron Bonica <rbonica@juniper.net>
To: "srcomp@ietf.org" <srcomp@ietf.org>
Thread-Topic: Forwarding Packets With Link Local Destination Addresses
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Subject: [Srcomp] FW: Forwarding Packets With Link Local Destination Addresses
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FYI


Juniper Business Use Only

> -----Original Message-----
> From: Ron Bonica
> Sent: Thursday, January 7, 2021 1:24 PM
> To: 神明達哉 <jinmei@wide.ad.jp>
> Cc: 6man@ietf.org
> Subject: RE: Forwarding Packets With Link Local Destination Addresses
> 
> Jinmei,
> 
> Thanks! I think that the following text from RFC 4007 covers the issue:
> 
> "   A node that receives a packet addressed to itself and containing a
>    Routing Header with more than zero Segments Left (Section 4.4 of [3])
>    first checks the scope of the next address in the Routing Header.  If
>    the scope of the next address is smaller than the scope of the
>    original destination address, the node MUST discard the packet. "
> 
>                                                                    Ron
> 
> 
> 
> Juniper Business Use Only
> 
> -----Original Message-----
> From: 神明達哉 <jinmei@wide.ad.jp>
> Sent: Thursday, January 7, 2021 1:09 PM
> To: Ron Bonica <rbonica@juniper.net>
> Cc: 6man@ietf.org
> Subject: Re: Forwarding Packets With Link Local Destination Addresses
> 
> [External Email. Be cautious of content]
> 
> 
> 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

[Srcomp] FW: Forwarding Packets With Link Local D… Ron Bonica