Re: [6lo] [SPF:fail] RE: uncompressed form

Michael Richardson <> Mon, 27 May 2019 01:19 UTC

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From: Michael Richardson <>
To: "Lijo Thomas" <>,
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Date: Sun, 26 May 2019 21:19:29 -0400
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Subject: Re: [6lo] [SPF:fail] RE: uncompressed form
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Lijo Thomas <>; wrote:
    > We agree your point that once the packet leaves the RPL network, then the
    > deadline information has to be carried in hop-by-hop header. In fact we
    > mentioned required text for calculating deadline time, while traversing
    > through different time zones.

Sorry to pick nits, but it's about whether the packet leaves an RPL network.
RPL runs across a multitude of layer-2s!
It's when it leaves an RFC8138 compressed LLN!

The difference in terminology leads to a difference in thinking.

    Pascal> Also we always claimed that RFC8138 is an encoding and that we can
    Pascal> always turn a packet to uncompressed and back. Deadline creates an
    Pascal> exception to that rule, which changes RFC 8138 into a sub IP protocol as
    Pascal> opposed to a compression.

To emphasize Pascal's point, and for many people who were not at the IETF
back in 2003, "subIP" was an entire area like Routing and Internet, which
addressed/created things like MPLS, ATM adaption layers, etc.   That's what
we are trying to avoid, because it has political and process issues.

    Pascal> All in all, I think that an IPv6 header (e.g., a new option in a
    Pascal> hop-by-hop header) should be provided, even if for now it appears to be
    Pascal> for completeness only.

I haven't read the deadline draft at this point, so I don't know if a new hop
by hop header makes sense, but it sounds right.

Michael Richardson <>;, Sandelman Software Works
 -= IPv6 IoT consulting =-