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 <[email protected]>
Sent: Sunday, December 1, 2019 5:31 PM
To: Bob Hinden <[email protected]>
Cc: Ron Bonica <[email protected]>; SPRING WG <[email protected]>
Subject: Re: [spring] SRv6 Network Programming and Link Local Source Addresses
On Mon, 2 Dec 2019, 08:35 Bob Hinden,
<[email protected]<mailto:[email protected]>> wrote:
Ron,
> On Nov 30, 2019, at 12:36 PM, Ron Bonica
> <[email protected]<mailto:[email protected]>>
> 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
>
>
>
>
>
>
>
>
>
>
> Juniper Business Use Only
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