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Re: [spring] SRv6 Network Programming and Link Local Source Addresses

Bob Hinden <bob.hinden@gmail.com> Sun, 01 December 2019 22:50 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Date: Sun, 01 Dec 2019 14:50:48 -0800
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Cc: Bob Hinden <bob.hinden@gmail.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG <spring@ietf.org>
To: Mark Smith <markzzzsmith@gmail.com>
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Subject: Re: [spring] SRv6 Network Programming and Link Local Source Addresses
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> On Dec 1, 2019, at 2:30 PM, Mark Smith <markzzzsmith@gmail.com> wrote:
> 
> 
> 
> On Mon, 2 Dec 2019, 08:35 Bob Hinden, <bob.hinden@gmail.com> wrote:
> Ron,
> 
> > On Nov 30, 2019, at 12:36 PM, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org> wrote:
> >
> > Pablo,
> >
> >
> >
> > Consider the packet (SA,DA) (S3, S2, S1; SL) where:
> >
> >
> >
> >       • SA is link-local (fe80)
> >       • DA, S3, S2, and S1 are all END.X
> >
> >
> > Section 4.2 suggests that this packet will be delivered over multiple hops to its destination, regardless of its link-local source address.
> 
> I would think that RFC2460 Section 2.5.6. "Link-Local IPv6 Unicast Addresses” covers this:
> 
>    Link-Local addresses are for use on a single link.  Link-Local
>    addresses have the following format:
> 
>    |   10     |
>    |  bits    |         54 bits         |          64 bits           |
>    +----------+-------------------------+----------------------------+
>    |1111111010|           0             |       interface ID         |
>    +----------+-------------------------+----------------------------+
> 
>    Link-Local addresses are designed to be used for addressing on a
>    single link for purposes such as automatic address configuration,
>    neighbor discovery, or when no routers are present.
> 
>    Routers must not forward any packets with Link-Local source or
>    destination addresses to other links.
> 
> I think that's RFC4291.

Sorry, of course, it RFC4291.

Thanks,
Bob

> 
> RFC4007, "IPv6 Scoped Address Architecture" does too, more generally and probably more formally, in particular section 9, "Forwarding".
> 
> Regards,
> Mark.
> 
> 
> 
> Bob
> 
> 
> >
> >
> >
> > Is this the case?
> >
> >
> >
> >                                                              Ron
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Juniper Business Use Only
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> 
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