On Tuesday, May 29, 2012 5:29 PM, Randy Bush <mailto:
randy@...> wrote:
>> AS_PATH is used to specify the path that the payload takes.
>
> really? i thought it was a routing loop detection mechanism.
> it's been a while since folk wrote research papers describing
> schemes for routing by AS.
>
> i would phrase it as
>
> AS_PATH specifies the ASs through which the routing announcement has
> passed.
>
>> Signed_AS_PATH is to verify the path that the update message takes.
>
> and then this works really nicely.
>
>> There is no reason they can not be different.
>
> and here i thought that detecting that they differ, as an attack, is
> the core goal of as-path validation.
I thought it was to prevent an AS from
announcing an update that it was not authorised to.
An entirely different thing.
>
> randy
--
Jakob Heitz.
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