svn commit: r238622 - head/etc/rc.d

[Hiroki Sato]

John Hay <jhay at meraka.org.za> wrote
  in <20120803042301.GA78461 at zibbi.meraka.csir.co.za>:

jh> While you guys are here, may I add a request that we go back to prefering
jh> IPv6 when IPv6 addresses are enabled. That is the way it was from FBSD-4
jh> up to FBSD-8. 9 is a big POLA here. The world is past World IPv6 Launch
jh> and I think people expect that if they configure IPv6 addresses, that
jh> would be prefered. If you configure IPv6 addresses and do not want them
jh> prefered, you are the odd one out and should have to do something.
jh>
jh> Otherwise when in the future are we going to change it?

 IPv4-preferred was chosen as the default because difference of the
 loopback performance was large.  I am a big fun to make FreeBSD
 IPv6-capable by default and prefer IPv6, but the concern was a
 possible negative impact for people who are using only IPv4.

 So, can we change it for 10.X now?  We cannot use "whether IPv6
 address is configured" because ::1 is always configured in GENERIC
 kernel.  The change will be "IPv6-preferred if the kernel has INET6
 support".

 Preferring IPv6 addresses has needed a knob in rc.conf even in 4.x:

 4.X:
 ipv6_enable="YES"
 ipv6_ifconfig_em0="2001:db8::1 prefixlen 64"

 9.X and later:
 ip6addrctl_policy="ipv6_prefer"
 ifconfig_em0_ipv6="inet6 2001:db8::1 prefixlen 64"

 and if we change the default to ipv6_prefer, ip6addrctl_policy= line
 will be unnecessary.

-- Hiroki
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