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Date: Wed, 8 Oct 1997 18:59:45 -0700 (PDT)
From: Shawn Ramsey <shawn@luke.cpl.net>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: How can I make virtual host?
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> Carefully.  :-)
> 
> FreeBSD uses the same basic tools that other OSs do, such as BIND and
> Apache.  The only specific part is setting up the Ethernet interface for
> the multiple addresses, which we call Ethernet aliases.  See /etc/rc.conf
> for instructions on how to set up alias'd addresses.  Note that aliased
> addresses MUST have a netmask of 255.255.255.255.

Actually no, not in 2.2.1 or 2.1.5. It does complain and give an error
message, but it will work fine with a netmask of 255.255.255.0.