Re: Route Information Options in Redirect Messages (updated)

Mark Smith <markzzzsmith@gmail.com> Wed, 08 February 2017 21:06 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Thu, 9 Feb 2017 08:06:05 +1100
Message-ID: <CAO42Z2yjDfep-WxZj9roHAwXfP6nh6mC2x4-+jyemPQ8B8qTTQ@mail.gmail.com>
Subject: Re: Route Information Options in Redirect Messages (updated)
To: "Templin, Fred L" <Fred.L.Templin@boeing.com>
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Hi Fred,

On 9 February 2017 at 07:33, Templin, Fred L <Fred.L.Templin@boeing.com> wrote:
> Hi Mark,
>
> What you are digging into here is out of scope for this document in the same
> way that orchestrating redirects for singleton destinations is out of scope for
> RFC4861.

What RFC covers redirects? RFC4443 doesn't.

>  All it says in the validation checks is:
>
>   - The IP source address of the Redirect is the same as the current first-hop
>      router for the specified ICMP Destination Address.
>
> It does not say anything about how all of the potential first-hop routers on
> the link coordinate among themselves to make sure that the Redirects don't
> steer hosts into a rat's nest of endless loops.
>
> Yes, just the same as for redirects of singleton destinations, there is an
> implied trust basis that routers that send Redirects will behave truthfully
> and consistently. It is no different for Redirects that contain RIOs.
>

Then my use case is not a use case for this. I have to provide
services to stub routers, but cannot trust them to act entirely
benevolently, because I don't own, operate or even have much influence
over what brand they are. I want to provide a the best and possibly
better service to them because their owners are paying me to e.g.,
local layer 2 switching in the exchange, but I cannot let one customer
impact the service of any other customer.


Regards,
Mark.