From owner-freebsd-questions@freebsd.org  Tue Feb 19 17:55:49 2019
Return-Path: <owner-freebsd-questions@freebsd.org>
Delivered-To: freebsd-questions@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id BED9B14F6F79
 for <freebsd-questions@mailman.ysv.freebsd.org>;
 Tue, 19 Feb 2019 17:55:49 +0000 (UTC)
 (envelope-from freebsd-questions-local@be-well.ilk.org)
Received: from be-well.ilk.org (be-well.ilk.org [23.30.133.173])
 by mx1.freebsd.org (Postfix) with ESMTP id 396D2699B7
 for <freebsd-questions@freebsd.org>; Tue, 19 Feb 2019 17:55:49 +0000 (UTC)
 (envelope-from freebsd-questions-local@be-well.ilk.org)
Received: by be-well.ilk.org (Postfix, from userid 1147)
 id 7358A33C58; Tue, 19 Feb 2019 12:55:39 -0500 (EST)
From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
To: toogley <toogley@mailbox.org>
Cc: freebsd-questions@freebsd.org
Subject: Re: static internal IP address as default networking config;
 ONLY if that fails, try to get an IP address via dhcp?
References: <880880467.23843.1550398783520@office.mailbox.org>
Reply-To: freebsd-questions@freebsd.org
Date: Tue, 19 Feb 2019 12:55:39 -0500
In-Reply-To: <880880467.23843.1550398783520@office.mailbox.org> (toogley's
 message of "Sun, 17 Feb 2019 11:19:43 +0100 (CET)")
Message-ID: <44h8czu0h0.fsf@be-well.ilk.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain
X-Rspamd-Queue-Id: 396D2699B7
X-Spamd-Bar: +++
Authentication-Results: mx1.freebsd.org
X-Spamd-Result: default: False [3.71 / 15.00]; ARC_NA(0.00)[];
 HAS_REPLYTO(0.00)[freebsd-questions@freebsd.org];
 FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[];
 NEURAL_SPAM_SHORT(0.41)[0.410,0]; MIME_GOOD(-0.10)[text/plain];
 MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[ilk.org];
 AUTH_NA(1.00)[]; REPLYTO_DOM_NEQ_FROM_DOM(0.00)[];
 NEURAL_SPAM_MEDIUM(0.98)[0.979,0];
 TO_MATCH_ENVRCPT_SOME(0.00)[];
 MX_GOOD(-0.01)[cached: be-well.ilk.org];
 RCPT_COUNT_TWO(0.00)[2]; NEURAL_SPAM_LONG(0.41)[0.414,0];
 R_SPF_NA(0.00)[]; RCVD_NO_TLS_LAST(0.10)[];
 FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[];
 SUBJECT_ENDS_QUESTION(1.00)[];
 ASN(0.00)[asn:7922, ipnet:23.30.0.0/15, country:US];
 MID_RHS_MATCH_FROM(0.00)[];
 IP_SCORE(-0.08)[ip: (0.09), ipnet: 23.30.0.0/15(0.07), asn: 7922(-0.52),
 country: US(-0.07)]; RCVD_COUNT_TWO(0.00)[2]
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 19 Feb 2019 17:55:49 -0000

toogley <toogley@mailbox.org> writes:

> Hey,
>
> i know how i can configure my FreeBSD machine to use a static internal
> ip addresss or how to get one via dhcp. As i sometimes change the
> netmask of my internal network, the networking via static ip addresses
> doesn't work anymore.
>
> ==> Is it possible to have a static network configuration as "default
> networking method" and ONLY if that fails, try to get one via dhcp?

There's no obvious definition of a static address "failing." You would
need to define that yourself, and implement a startup script that checks
for whatever you come up with, then starts dhcpc if it doesn't see what
it wants. You could use something like connectivity to a particular
host, for example.

Personally, I'd just let the FreeBSD machine use DHCP all the time if I
possibly could.

Be well.