Re: rework IPsec intro

[Michael Richardson <mcr%sandelman.ca@localhost>]

Andrew Cagney <andrew.cagney%gmail.com@localhost> wrote:
    >> Good work.  Maybe, mention that AH is fundamentally incompatible with
    >> NAT44, and as a result, as had essentially zero deployment outside of
    >> limited domains.  (see RFC8799)

    > Thanks for the addition, I'll add it.  I was trying to be subtle and
    > only hint at AH being dead.  Screw that :-)

As an advocate for AH use, it died when we tried to use it 15 years ago in
SEND (Securing Neighbor Discovery), but we couldn't, because we defined the
behaviour of unknown-SPI wrong.  For ESP, error.
For AH, pretend there is no AH and keep going.

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