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Date:      Sun, 25 Dec 2016 06:59:34 +0900 (JST)
From:      Hiroki Sato <hrs@FreeBSD.org>
To:        jdison16@yahoo.com
Cc:        freebsd-net@freebsd.org, mike@sentex.net
Subject:   Re: How to configure another loopback device?
Message-ID:  <20161225.065934.1192800130496756773.hrs@allbsd.org>
In-Reply-To: <252311393.1502179.1482604113540@mail.yahoo.com>
References:  <20161224.205457.537205546150309741.hrs@allbsd.org> <31938292.1421737.1482589536048@mail.yahoo.com> <252311393.1502179.1482604113540@mail.yahoo.com>

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John Dison <jdison16@yahoo.com> wrote
  in <252311393.1502179.1482604113540@mail.yahoo.com>:

jd> > Does adding ifconfig_lo0="inet 127.0.0.1/8" to /etc/rc.conf work?
jd>
jd> Yes, adding ifconfig_lo0="inet 127.0.0.1/8" helps indeed.
jd>
jd> Interesting is that if I also add ifconfig_lo0_ipv6="inet6 ::1/128"
jd> then ::1/128 will be on lo1.  If I do not add that line, it will be on lo0.
jd>
jd> Looks weird but that workaround work.  Thanks.

 Here are the reasons:

 - 127.0.0.1/8 will be configured on lo0 in rc.d scripts if
   ifconfig_lo0 is missing after processing ifconfig_IF and before
   doing ifconfig_IF_alias*.

 - You cannot manually configure ::1/128 because it is configured by
   the kernel when a loopback interface becomes "up".  If you have an
   ifconfig_lo1 and no ifconfig_lo0, ifconfig_lo1 will be processed
   and make lo1 "up" first.

-- Hiroki

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