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Date:      Mon, 05 Sep 2011 17:45:36 -0700
From:      Doug Barton <dougb@FreeBSD.org>
To:        Arnaud Lacombe <lacombar@gmail.com>
Cc:        freebsd-net@freebsd.org, Adrian Chadd <adrian@freebsd.org>
Subject:   Re: No IPFW binary compat across versions ?
Message-ID:  <4E656D30.3040905@FreeBSD.org>
In-Reply-To: <CACqU3MWToUAKPMLGYfkHgZkCqvnjJF=jkvqYV-PTieP9x96nrg@mail.gmail.com>
References:  <CACqU3MXVLjJvF6RGqpC-hvnbTgb-uNC7V0AP0ofXDRs4n7Nmtg@mail.gmail.com> <CAHM0Q_N0UZu0tvqL6TiCOmJfHAt4sBtWM1abE%2BuJPS9ubARrfg@mail.gmail.com> <CACqU3MUjjYXabmYZtivDQKJ2v6HcWyo1_3AuTyyjN1o5%2BV6hhg@mail.gmail.com> <CACqU3MVvgftNMrGnoPaXB-MwyDqMc4jLd3qPWj9YEYdN3fJyyA@mail.gmail.com> <CAJ-Vmon464X%2BVh6=Ofiwnkt%2BAnmGysJAOsEiKxAkZ90tndGo7g@mail.gmail.com> <CACqU3MWToUAKPMLGYfkHgZkCqvnjJF=jkvqYV-PTieP9x96nrg@mail.gmail.com>

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On 09/05/2011 17:18, Arnaud Lacombe wrote:
> From my point of view, I should be able to run a FreeBSD 9.0 kernel
> (when released) on top of a FreeBSD 5 userland without such issues.

Unfortunately your expectation is completely unrealistic. We do our best
to maintain backward compatibility but sometimes improvements require
breaking the KBI/ABI.

Also, we have never supported running a kernel from RELENG_N on anything
older than the latest version of RELENG_{N-1}.


hth,

Doug

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