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Date:      Thu, 27 Jul 2000 15:47:04 -0400 (EDT)
From:      Robert Watson <rwatson@FreeBSD.ORG>
To:        DRHAGER@de.ibm.com
Cc:        "f.johan.beisser" <jan@caustic.org>, freebsd-net@FreeBSD.ORG
Subject:   Re: true aliased interface?
Message-ID:  <Pine.NEB.3.96L.1000727154617.96611D-100000@fledge.watson.org>
In-Reply-To: <C1256927.00451F24.00@d12mta01.de.ibm.com>

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On Tue, 25 Jul 2000 DRHAGER@de.ibm.com wrote:

> For me this looks like Solaris..
> I dont know if this is some System V related feature.
> 
> In BSD you cant create this sub-interfaces you want.
> It is always the same hardware beneath.
> 
> Ifconfig offers aliasing, if you want the adapter to listen
> on another Ip-adress in addition to the adress you gave it
> initially.
> 
> "Alias" is some sort of misnomer, I think. You can put a lot
> of IP definitons on a Interface, but they are completely equal,
> there is no preference between them. You can give a interface
> a first adress, then a "alias", remove the first adress treating
> it as an alias and then you will have the same interface as if
> it would have been configured with this "alias" adress right at
> the beginning.

This is why I followed the BSD/OS lead and added alternative forms for
alias addition and deletion:

ifconfig fxp0 inet add 192.0.2.200 255.255.255.255
ifconfig fxp0 inet remove 192.0.2.200

  Robert N M Watson 

robert@fledge.watson.org              http://www.watson.org/~robert/
PGP key fingerprint: AF B5 5F FF A6 4A 79 37  ED 5F 55 E9 58 04 6A B1
TIS Labs at Network Associates, Safeport Network Services



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