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From: "Dewayne Geraghty" <dewayne.geraghty@heuristicsystems.com.au>
To: "'Hiroki Sato'" <hrs@freebsd.org>
References: <CAN6yY1sRSWEMj2_bJX_DRZMxgk4tf50_ODe8O8i2d6wTrGW3ug@mail.gmail.com>
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 <20130712.160358.1330135778606339435.hrs@allbsd.org>
Subject: RE: ipv6_addrs_IF aliases in rc.conf(5)
Date: Wed, 17 Jul 2013 07:36:25 +1000
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Sato-san,

You have provided a very useful summary of ifconfig parameters for rc.conf. However, you are missing one example that would provide
clearer understanding.  Would you please advise if 
 
ipv4_addr_em0="10.2.1.1-10/32"

is deprecated, backward compatible or remains valid into the future?

I particularly appreciate the succinctness of:
ifconfig_em0_aliases="inet 10.3.3.201-204/24 inet6 2001:db8:210-213::1/64 inet 10.1.1.1/24"

Kind regards, Dewayne.