From owner-freebsd-stable@FreeBSD.ORG  Wed Jul 17 11:41:34 2013
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From: Mark Felder <feld@freebsd.org>
To: Thomas Steen Rasmussen <thomas@gibfest.dk>, freebsd-stable@freebsd.org
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Subject: Re: ipv6_addrs_IF aliases in rc.conf(5)
Date: Wed, 17 Jul 2013 06:41:33 -0500
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On Wed, Jul 17, 2013, at 6:09, Thomas Steen Rasmussen wrote:
> Hello,
> 
> Does this work on stable/9 or only on current ? If not, are there
> any plans to MFC ? I ask because I don't see the
> ifconfig_IF_aliases syntax in /etc/defaults/rc.conf on a newly
> built stable/9 box.
> 

It's there in /etc/defaults/rc.conf, but maybe not very obvious:

#ifconfig_lo0_alias0="inet 127.0.0.254 netmask 0xffffffff" # Sample
alias entry.

It is also in the Handbook:

http://www.freebsd.org/doc/en/books/handbook/configtuning-virtual-hosts.html