From owner-freebsd-bugs  Sun Jan  7 12:10:20 2001
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP id 3163537B404
	for <freebsd-bugs@hub.freebsd.org>; Sun,  7 Jan 2001 12:10:02 -0800 (PST)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.11.1/8.11.1) id f07KA2X02095;
	Sun, 7 Jan 2001 12:10:02 -0800 (PST)
	(envelope-from gnats)
Received: from ussenterprise.ufp.org (unknown [209.249.106.101])
	by hub.freebsd.org (Postfix) with ESMTP id E43FE37B400
	for <FreeBSD-gnats-submit@freebsd.org>; Sun,  7 Jan 2001 12:09:12 -0800 (PST)
Received: (from root@localhost)
	by ussenterprise.ufp.org (8.11.1/8.11.1) id f07K9AB01844;
	Sun, 7 Jan 2001 15:09:10 -0500 (EST)
	(envelope-from bicknell)
Message-Id: <200101072009.f07K9AB01844@ussenterprise.ufp.org>
Date: Sun, 7 Jan 2001 15:09:10 -0500 (EST)
From: bicknell@ufp.org
Reply-To: bicknell@ufp.org
To: FreeBSD-gnats-submit@freebsd.org
X-Send-Pr-Version: 3.2
Subject: conf/24130: rc.network6 assumes single ipv6 interface is always the first interface
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


>Number:         24130
>Category:       conf
>Synopsis:       rc.network6 assumes single ipv6 interface is always the first interface
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jan 07 12:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Leo Bicknell
>Release:        FreeBSD 4.2-RELEASE i386
>Organization:
United Federation of Planets
>Environment:

	FreeBSD 4.2 compiled with IPv6 support.

>Description:

	IPv6 end hosts are only allowed to autoconfigure a single interface,
as autoconfiguring multiple interfaces may result in network reachability issues.
This is correctly documented in /etc/rc.network6.  However, the code in 
/etc/rc.network6 assumes that an autoconfiguring host _has only one NIC_, which
is not a correct assumption.

	In my enviornment, the IPv6 network is separate from the IPv4 network.
As such the machine has two NIC's, one for IPv4 _only_, and one for IPv6 _only_.
The IPv6 NIC is the second NIC in the box (fxp1).  This does not violate the
rule of having a single NIC for IPv6 autoconfiguration, but is not an allowed
configuration by the current /etc/rc.network6 script.

>How-To-Repeat:

	Configure a box with two nics (the examples below assume fxp0 and fxp1).
Try the following /etc/rc.conf config lines:


network_interfaces="fxp0 lo0"
ifconfig_fxp0="inet 209.249.106.101 netmask 255.255.255.240"
defaultrouter="209.249.106.97"
ipv6_enable="YES"
ipv6_network_interfaces="fxp1"

	Due to the following code in /etc/rc.network6:

                        #
                        # manual configurations - in case ip6_gateway_enable=NO
                        # you can configure only single interface,
                        # as specification assumes that
                        # autoconfigured host has single interface only.
                        #
                        set `ifconfig -l`
                        ipv6_network_interfaces="$1"

	The code will override the ipv6_network_interfaces="fxp1" with 
ipv6_network_interfaces="fxp0" (the first interface in the box) in these
lines.

	Note, it is unclear if ipv6_network_interfaces="fxp1" should really
be ipv6_network_interfaces="fxp1 lo0", which makes more sense.  The code does
not seem to allow for this possibility either.

>Fix:

	A simple hack would be to change set `ifconfig -l` to be 
set $ipv6_network_interfaces, allowing the second line to get the first
specified interface, if more than one were specified.  I believe more
elaborte checking might be in order though, to allow lo0 to be configured
as well, and to produce better warning / error messages.


>Release-Note:
>Audit-Trail:
>Unformatted:


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message