Re: draft-.*-6man-sadr-ra-00

Hi Ole,

A quote from draft-baker-rtgwg-src-dst-routing-use-cases:

An initial approach was suggested in [RFC3704], which
   assumed that a packet following a default route to an egress CPE
   Router might arrive at the wrong one, and need to be redirected to
   the right CPE Router.

 He goes on to say that SADR solutions are needed and that's what we
are saying at the host while Fred's draft is about what routers should
do.

I think the operators don't like ICMP messages because that's what is
used in DOS attacks.

Regarding Pierre's reply, I already have it in Section 5.1
draft-sarikaya-6man-sadr-overview-05.
We can add the redirect argument there as well, hopefully after it
becomes a WG draft :-)

Regards,

Behcet

On Wed, Mar 4, 2015 at 2:32 AM, Ole Troan <otroan@employees.org> wrote:
>> If there's no consensus on the problem, I am quite certain there will
>> be no consensus on a solution.
>
> Let me give the problem description a try:
>
> A host is directly connected (single interface) to two border routers on the same link.
>  Assuming multiprefix multihoming and BCP38, the problem is, how can we ensure that the host has enough information to:
>
>     - given destination and next-hop can chose the correct source address (matching the border router PA assignment)
>     - given a source address and a destination chose the correct next-hop
>
> This is not a problem when a host is further away from the border routers (the network will do SADR).
> If the two border routers do SADR and exchange routing, then if host picks wrong next-hop, traffic will still be routed correctly. Otherwise a border router returns a destination unreachable ICMP with code source address failed ingress/egress policy.
>
> Anything more to this problem?
>
> cheers,
> Ole
>
>
>
>
>
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