From owner-freebsd-net@FreeBSD.ORG  Wed Jun 29 15:29:17 2011
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Date: Wed, 29 Jun 2011 18:29:14 +0300
From: Oleg Cherevko <olwi@fb-n.l.org.ua>
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Subject: Re: ifconfig alias: same subnet netmask question
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On 29.06.2011 18:10, Oleg Cherevko wrote:
> Are there any drawbacks in setting aliases like this:
> 	ifconfig em0 inet 192.168.1.1 netmask 0xffffff00
> 	ifconfig em0 inet 192.168.1.2 netmask 0xffffff00
> instead of traditional:
> 	ifconfig em0 inet 192.168.1.1 netmask 0xffffff00
> 	ifconfig em0 inet 192.168.1.2 netmask 0xffffffff
> (again, for more or less recent FreeBSD versions)?

Sorry, the above examples should read:
     ifconfig em0 inet 192.168.1.1 netmask 0xffffff00
     ifconfig em0 inet 192.168.1.2 netmask 0xffffff00 alias
and
     ifconfig em0 inet 192.168.1.1 netmask 0xffffff00
     ifconfig em0 inet 192.168.1.2 netmask 0xffffffff alias
of course.

-- 
Olwi