What is the rc.conf syntax for /etc/rc.d/ip6addrctl's "prefer_ipv4" option?

[Hiroki Sato]

Terry Kennedy <TERRY at tmk.com> wrote
  in <01O465OEXSGK000QBQ at tmk.com>:

TE>   I initially asked this over in networking in the FreeBSD forums, but it
TE> was suggested I ask here, since this seems to be where a bunch of discussion
TE> about this particular topic has appeared in the past.
TE>
TE>   The system is 8-STABLE on amd64 of a week ago. Please look at my original
TE> post on the FreeBSD Forums: http://forums.freebsd.org/showthread.php?t=25340
TE>
TE>   In brief, I've tried all of the following, one at a time, in rc.conf to
TE> no effect:
TE>
TE> ip6addrctl_flags="prefer_ipv4"
TE> ip6addrctl_policy="prefer_ipv4"
TE> ipv6_prefer="NO"
TE> ip6addrctl="prefer_ipv4"
TE>
TE>   Again, please look at the discussion in the Forums for more background
TE> on this, why it is needed, and the large set of changes in the etc/rc.d/
TE> ip6addrctl script version 1.11 that seem to change the way it handles this.

 The knob to select IPv4-preferred or IPv6-preferred in 8.X is
 $ipv6_enable.  If you want IPv4-preferred with ipv6_enable=YES,
 please use /etc/ip6addrctl.conf.

 The $ip6addrctl_policy is one introduced in 9.X and later for
 selecting one of them independently from whether IPv6 is enabled or
 not.  This variable is not supported in 8.X.

-- Hiroki
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