Date: Mon, 05 Oct 2009 11:54:08 -0700 From: "Kevin Oberman" <oberman@es.net> To: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> Cc: jhay@meraka.org.za, freebsd-current@FreeBSD.org, Hiroki Sato <hrs@FreeBSD.org>, freebsd-rc@FreeBSD.org Subject: Re: nd6 change and rc.d/network_ipv6 -> rc.d/netif integration Message-ID: <20091005185408.728471CC0E@ptavv.es.net> In-Reply-To: Your message of "Mon, 05 Oct 2009 20:08:40 %2B0200." <86my45vhlj.fsf@ds4.des.no>
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> From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> > Date: Mon, 05 Oct 2009 20:08:40 +0200 > Sender: owner-freebsd-current@freebsd.org > > Hiroki Sato <hrs@FreeBSD.org> writes: > > John Hay <jhay@meraka.org.za> writes: > > > Is there a good reason why we still ship with ipv6 off by default? > > What do you mean by "off by default"? I think IPv6 is not disabled by > > default with the patch. > > % ident /usr/src/etc/defaults/rc.conf > /usr/src/etc/defaults/rc.conf: > $FreeBSD: head/etc/defaults/rc.conf 197619 2009-09-29 16:49:10Z dougb $ > % grep ipv6_network_interfaces /usr/src/etc/defaults/rc.conf > ipv6_network_interfaces="none" # List of IPv6 network interfaces > #ipv6_network_interfaces="ed0 ep0" # Examples for router > % grep ipv6_prefer /usr/src/etc/defaults/rc.conf > ipv6_prefer="NO" # Use IPv6 when both IPv4 and IPv6 can be used > > Does mean that IPv6 is disabled by default? Who knows? There is no > coherent explanation *anywhere* of what these variables mean, and > rc.conf(5) does not mention them at all. In fact, the first hit for > "ipv6" in rc.conf(5) is this: > > ipv6_enable > (bool) Enable support for IPv6 networking. Note that this > requires that the kernel has been compiled with options > INET6. Am I missing something here? From the same /etc/defaults/rc.conf: ### IPv6 options: ### ipv6_enable="NO" # Set to YES to set up for IPv6. That looks about a "disabled out of the box" as it gets. As far as I can see (which may not be far), ipv6_network_interfaces is only relevant to IPv6 routing. I believe that ipv6_prefer controls the default behavior when DNS returns both IPv4 and IPv6 addresses for a host. If it is set to "NO", IPv4 will be tried first (preferred). If set to "YES", the IPv6 address will be preferred. I strongly recommend keeping ipv6_prefer set to "NO". -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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