Date: Sun, 7 Jan 2001 15:09:10 -0500 (EST) From: bicknell@ufp.org To: FreeBSD-gnats-submit@freebsd.org Subject: conf/24130: rc.network6 assumes single ipv6 interface is always the first interface Message-ID: <200101072009.f07K9AB01844@ussenterprise.ufp.org>
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>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:
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