I agree; I meant that even at the receiving end you can't authenticate it,
let alone the intermediate hops.

   Brian

Michael Thomas wrote:
> 
> Brian E Carpenter writes:
>  > Yes, the flow label is explicitly excluded from AH. So it could be modified
>  > en route and you can't authenticate its value. Assuming we decide to use
>  > it as an end2end value, that could be viewed as a bug.
> 
>    That would be a pretty funny view. The only
>    way to make it immutable would be to share a
>    security association with each participating
>    router along the way. I don't think we want
>    to even vaguely contemplate going there.
> 
>            Mike

-- 
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Brian E Carpenter 
Distinguished Engineer, Internet Standards & Technology, IBM 
On assignment at the IBM Zurich Laboratory, Switzerland
Board Chairman, Internet Society http://www.isoc.org
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