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

Ron Bonica <rbonica@juniper.net> Sun, 01 December 2019 22:47 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Mark Smith <markzzzsmith@gmail.com>, Bob Hinden <bob.hinden@gmail.com>
CC: SPRING WG <spring@ietf.org>
Thread-Topic: [spring] SRv6 Network Programming and Link Local Source Addresses
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Date: Sun, 01 Dec 2019 22:47:08 +0000
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Subject: Re: [spring] SRv6 Network Programming and Link Local Source Addresses
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Mark, Bob,

Yes, I agree that routers should not forward packets with link local source addresses.

Pablo,

Maybe we should update section 4.2 of the network programming draft to reflect this?

                                                                 Ron


From: Mark Smith <markzzzsmith@gmail.com>
Sent: Sunday, December 1, 2019 5:31 PM
To: Bob Hinden <bob.hinden@gmail.com>
Cc: Ron Bonica <rbonica@juniper.net>; SPRING WG <spring@ietf.org>
Subject: Re: [spring] SRv6 Network Programming and Link Local Source Addresses


On Mon, 2 Dec 2019, 08:35 Bob Hinden, <bob.hinden@gmail.com<mailto:bob.hinden@gmail.com>> wrote:
Ron,

> On Nov 30, 2019, at 12:36 PM, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org<mailto: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.

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
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