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Date: Mon, 26 Jan 2004 17:42:58 +0100
From: jan.muenther@nruns.com
To: Mike <addymin@pacbell.net>
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Subject: Re: Configuring IP address aliasing
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Hello,

> I found the reference to using the 255.255.255.255 netmask via Google, 
> however, I have Michael Lucas's book "Absolute BSD" and reference on 
> pages 103 & 104 (on IP aliasing) clearly show using the same netmask as 
> the real interface when creating IP aliases.

This book is blatantly wrong then. Basically, the point is that the network
route already exists and the network extension is already clear. So, you
must use a non-conflicting netmask. 

The ifconfig manpage describes this as well, by the way. 

Cheers, J.