From owner-freebsd-jail@freebsd.org  Sat Sep  3 15:52:28 2016
Return-Path: <owner-freebsd-jail@freebsd.org>
Delivered-To: freebsd-jail@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 12A2FBCED93
 for <freebsd-jail@mailman.ysv.freebsd.org>;
 Sat,  3 Sep 2016 15:52:28 +0000 (UTC)
 (envelope-from kostikbel@gmail.com)
Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1])
 (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id A0664252D;
 Sat,  3 Sep 2016 15:52:27 +0000 (UTC)
 (envelope-from kostikbel@gmail.com)
Received: from tom.home (kib@localhost [127.0.0.1])
 by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id u83FqMSU033897
 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO);
 Sat, 3 Sep 2016 18:52:22 +0300 (EEST)
 (envelope-from kostikbel@gmail.com)
DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua u83FqMSU033897
Received: (from kostik@localhost)
 by tom.home (8.15.2/8.15.2/Submit) id u83FqM3C033896;
 Sat, 3 Sep 2016 18:52:22 +0300 (EEST)
 (envelope-from kostikbel@gmail.com)
X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com
 using -f
Date: Sat, 3 Sep 2016 18:52:22 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: James Gritton <jamie@freebsd.org>
Cc: Grzegorz Junka <list1@gjunka.com>, freebsd-jail@freebsd.org
Subject: Re: Changing jail's IP automatically
Message-ID: <20160903155222.GV83214@kib.kiev.ua>
References: <872dfbe1-3f39-bf5f-44b2-611bd92a1210@gjunka.com>
 <4fa37d2e14665ff5a00548626e55142f@gritton.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4fa37d2e14665ff5a00548626e55142f@gritton.org>
User-Agent: Mutt/1.6.1 (2016-04-27)
X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00,
 DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no
 autolearn_force=no version=3.4.1
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home
X-BeenThere: freebsd-jail@freebsd.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "Discussion about FreeBSD jail\(8\)" <freebsd-jail.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-jail>,
 <mailto:freebsd-jail-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-jail/>
List-Post: <mailto:freebsd-jail@freebsd.org>
List-Help: <mailto:freebsd-jail-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-jail>,
 <mailto:freebsd-jail-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 03 Sep 2016 15:52:28 -0000

On Sat, Sep 03, 2016 at 09:33:08AM -0600, James Gritton wrote:
> On 2016-09-02 15:08, Grzegorz Junka wrote:
> > I am using a jail on my laptop and I often connect to different
> > WiFi's, which of course assign different IPs to my laptop. I set up
> > the jail by adding an alias to wlan0 and I need to update the IP every
> > time I switch the WiFi network. Is it possible to create a jail with
> > IP assigned dynamically, e.g. from DHCP, or at least switch between
> > predefined IPs more easily than by editing /etc/jail.conf?
> 
> You can always add addresses later.

I use private address in the jail, and NAT it on outside interface.
This worked fine on a roaming laptop with DHCP, several years ago.