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

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Message-ID: <1484167422.15816.1.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 11 Jan 2017 12:43:42 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     "Jonathan T. Leighton" <jtleight@...l.edu>, 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 14:59 -0500, Sowmini Varadhan wrote:

> I think the RFC states somewhere that you should never ever
> send out a v4 mapped address on the wire.

Can you point the exact RFC ?

https://tools.ietf.org/html/rfc2765  seems to allow just that.


Jonathan issue is about terminating such flows in TCP stack, which is
likely not needed/useful.