Date: Tue, 06 Oct 2009 04:50:43 +0900 (JST) From: Hiroki Sato <hrs@FreeBSD.org> To: des@des.no Cc: jhay@meraka.org.za, freebsd-current@FreeBSD.org, freebsd-rc@FreeBSD.org Subject: Re: nd6 change and rc.d/network_ipv6 -> rc.d/netif integration Message-ID: <20091006.045043.187164797.hrs@allbsd.org> In-Reply-To: <86my45vhlj.fsf@ds4.des.no> References: <20091005055806.GB58246@zibbi.meraka.csir.co.za> <20091005.182342.167950100.hrs@allbsd.org> <86my45vhlj.fsf@ds4.des.no>
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[-- Attachment #1 --]
Dag-Erling Smørgrav <des@des.no> wrote
in <86my45vhlj.fsf@ds4.des.no>:
de> Hiroki Sato <hrs@FreeBSD.org> writes:
de> > John Hay <jhay@meraka.org.za> writes:
de> > > Is there a good reason why we still ship with ipv6 off by default?
de> > What do you mean by "off by default"? I think IPv6 is not disabled by
de> > default with the patch.
de>
de> % ident /usr/src/etc/defaults/rc.conf
de> /usr/src/etc/defaults/rc.conf:
de> $FreeBSD: head/etc/defaults/rc.conf 197619 2009-09-29 16:49:10Z dougb $
de> % grep ipv6_network_interfaces /usr/src/etc/defaults/rc.conf
de> ipv6_network_interfaces="none" # List of IPv6 network interfaces
de> #ipv6_network_interfaces="ed0 ep0" # Examples for router
de> % grep ipv6_prefer /usr/src/etc/defaults/rc.conf
de> ipv6_prefer="NO" # Use IPv6 when both IPv4 and IPv6 can be used
de>
de> Does mean that IPv6 is disabled by default? Who knows? There is no
de> coherent explanation *anywhere* of what these variables mean, and
de> rc.conf(5) does not mention them at all. In fact, the first hit for
de> "ipv6" in rc.conf(5) is this:
de>
de> ipv6_enable
de> (bool) Enable support for IPv6 networking. Note that this
de> requires that the kernel has been compiled with options
de> INET6.
No, the rc.conf(5) has been updated in r197526:
ipv6_enable
(bool) If the variable is ``YES'', ``inet6 accept_rtadv'' is
added to all of ifconfig_<interface>_ipv6 and the ipv6_prefer
is defined as ``YES''.
This variable is deprecated. Use ipv6_prefer and
ifconfig_<interface>_ipv6.
and UPDATING also explains the relationship between the $ipv6_enable
and the other variables.
IMHO "Enabling (or disabling) IPv6" is not a correct expression for
$ipv6_enable and $ipv6_prefer. If you use a kernel with "options
INET6" (GENERIC has it) IPv6 is enabled, and $ipv6_enable=NO in the
old releases does not disable the functionality. It just controlled
whether $ipv6_* in rc.conf are ignored or not.
-- Hiroki
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