netdev - Re: TCP using IPv4-mapped IPv6 address as source

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Date:   Wed, 11 Jan 2017 13:47:37 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "Jonathan T. Leighton" <jtleight@...l.edu>
Cc:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        netdev@...r.kernel.org, edumazet@...gle.com,
        Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: Re: TCP using IPv4-mapped IPv6 address as source

On Wed, 2017-01-11 at 16:26 -0500, Jonathan T. Leighton wrote:

> I'm sure I understand what you're saying here. There should be no flow 
> to terminate.

rfc2765 describes a way to use IPv4-mapped IPv6 packets on the wire.

What I meant by 'terminating' was that it does not tell if an end system
(a host) is allowed to natively generate these packets.

Anyway,
https://tools.ietf.org/html/draft-itojun-v6ops-v4mapped-harmful-00 

(which does not appear to be an RFC), tells us this would be
dangerous ;)