> -----Original Message-----
> From: ipv6-boun...@ietf.org [mailto:ipv6-boun...@ietf.org] On 
> Behalf Of Brian E Carpenter

>   "There appear to be two viable approaches:
>    1.  Definitively forbid locally defined use of the flow label.
>        Strengthen RFC 3697 to say that hosts SHOULD set a 
> pseudo-random
>        label value, which would clarify and limit its 
> possible uses.  In
>        particular, its use for load balancing and possibly as a nonce
>        would be encouraged.
>    2.  Encourage locally defined use of the flow label.  This approach
>        would make the flow label mutable and would exclude 
> any use case
>        depending on end-to-end immutability.  It would encourage
>        applications of a pseudo-random flow label, such as load
>        balancing, on a local basis, but it would exclude end-to-end
>        applications such as [I-D.blake-ipv6-flow-label-nonce]."

#1 appeals because it could be used instead of the 5-tuple available in IPv4. 
On the other hand, a lack of header checksum in IPv6 spoils that party at least 
to some extent. If there's something that can be done to fix the lack of header 
checksum, I would favor #1.

Bert
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