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Date: Fri, 02 Nov 2001 13:57:34 -0800
From: Bruce Ferrell <bferrell@baywinds.org>
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To: Bernd Eckenfels <ecki@lina.inka.de>
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Subject: Re: unnumbered interfaces? - OT
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Bernd Eckenfels wrote:
> 
> In article <200111011522.QAA22531@zhadum.sara.nl> you wrote:
> >> I'm trying to understand unnumbered interfaces.  From
> >> searching the web, they seem to be point-to-point links
> >> that do not have IP numbers (hence the name).

They are in fact, used for point-to-point links.  It allows someone to
build a kind of distributed router; Kind of like the old IBM remote
bridge arrangemets.  Those had either a token ring or ethernet card and
a WAN card of some kind (usually SDLC or X.25) connecting them
together.  Kind of cool in a weird, expensive sort of way.

> It is Cisco Speak. In Linux you simply give the Interface an IP Address of
> an exisiting Interface, and then you have an "unnumbered" interface. It
> simply means it does not add an additional address.
> 
> Routing in modern operating systems is so easy and natural with interface
> and host routes, dont worry about cisco legacy.
> 
> Greetings
> Bernd
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