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Date: Wed, 15 Oct 2014 19:54:09 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Glen Barber <gjb@FreeBSD.org>
Subject: Re: No network interfaces with 10.1-RC2 kernel and 9.2 userland
Message-ID: <20141015165409.GZ2153@kib.kiev.ua>
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Cc: freebsd-stable@FreeBSD.org, Eric van Gyzen <eric@vangyzen.net>,
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On Wed, Oct 15, 2014 at 04:36:19PM +0000, Glen Barber wrote:
> On Wed, Oct 15, 2014 at 11:56:43AM -0400, Eric van Gyzen wrote:
> > I used freebsd-update to update a 9.2-RELEASE-p10 i386 system to
> > 10.1-RC2.  After installing the kernel and rebooting, still using the
> > 9.2 userland, ifconfig showed no interfaces.  Is this expected?  Do I
> > need to bounce through 9.3 or 10.0 first?
> > 
> 
> What interfaces should be there?
> 
> Please provide the contents of /var/run/dmesg.boot.

The interfaces used to manage networking (i.e. the kernel calls utilized
by ifconfig(8), route(8) and others) are not kept stable between stable
branches.  Usually, the compatibility is broken.

Simply put, you cannot use configuration utilities from stable/9 on
stable/10 kernel.  This is expected.

You did not followed the instruction in UPDATING.