From owner-freebsd-net@freebsd.org  Wed Jan 11 15:23:37 2017
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@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 16274CAAA71
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Wed, 11 Jan 2017 15:23:37 +0000 (UTC)
 (envelope-from citrin+bsd@citrin.ru)
Received: from hz.citrin.ru (hz.citrin.ru [88.198.212.3])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id D52291164
 for <freebsd-net@FreeBSD.org>; Wed, 11 Jan 2017 15:23:36 +0000 (UTC)
 (envelope-from citrin+bsd@citrin.ru)
Received: from x220.lan (c-24-60-168-172.hsd1.ct.comcast.net [24.60.168.172])
 by hz.citrin.ru (Postfix) with ESMTPSA id 426C829A309
 for <freebsd-net@FreeBSD.org>; Wed, 11 Jan 2017 15:23:28 +0000 (UTC)
From: Anton Yuzhaninov <citrin+bsd@citrin.ru>
Subject: fe80::1%lo0
To: freebsd-net@FreeBSD.org
Message-ID: <94a99b96-808b-8f50-a4a3-eec8659737cd@citrin.ru>
Date: Wed, 11 Jan 2017 10:23:26 -0500
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101
 Thunderbird/45.6.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrin.ru; s=s0;
 t=1484148208; bh=1By8mEZqAktq8BSs2/QNN8ZPz9oE6VHEacWgv0Cv7H0=;
 h=From:Subject:To:Message-ID:Date:MIME-Version:Content-Type:Content-Transfer-Encoding;
 b=5xIUL68sS7ldS5aHhtDtWu3ANocbjyamePkfeDY2KtJvHJi5U10tRPr6ykCI/XM3uAdoXzwHvyl2UEbE7C0nyNsipz5qHjVWNZjYmZxYDtsi62IoT5VAUUQWAIexAf1QUbr0WfMeFgLjwwx4L4MXsCWjaLlPgHcIAyNKGeEFFC0=
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 11 Jan 2017 15:23:37 -0000

Hello,

Why FreeBSD adds fe80::1%lo0 to the loopback interface?

I know, that in IPv6 each interface should have a link-local address, 
but ::1 can be considered as link-local:
https://tools.ietf.org/html/rfc4291#section-2.5.3

I think fe80::1 is unnecessary can be removed. For all practical 
purposes ::1 should be enough.

BTW Linux has only ::1 on the loopback interface.