From owner-freebsd-questions  Mon Jun 10 20: 8:18 2002
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Date: Tue, 11 Jun 2002 05:08:14 +0200 (CEST)
From: =?iso-8859-1?q?m=20p?= <sumirati@yahoo.de>
Subject: Re: Ip aliases in FreeBSD
To: budsz@kumprang.or.id
Cc: freebsd-questions@FreeBSD.ORG
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> Hi,
> 
> I tried ip aliasing in FreeBSD 4.6 RC, so if I use the same subnet or
> use more than 2 ip always failure for ex:
> 
> Case 1:
> 
> A: 192.168.0.1/255.255.255.240-
>                                | The result (A=up, B=down)
> B: 192.168.0.2/255.255.255.240-
> 
> 
> Case 2: (3 ip aliasing)
> 
> A: 192.168.0.1/255.255.255.240-
>                                |  
> B: 192.168.0.2/255.255.255.230-  The result (A=up,B=down,C=down) 
>                                |
> C: 192.168.0.3/255.255.255.255-
> 
> Case 3 :
> 
> A: 192.168.0.1/255.255.255.240-
>                                | The result (A=up,B=up)   
> B: 192.168.0.2/255.255.255.255-
> 
> 
> Can somebody explain about this..?
> 

Hi, 

if you check in the mailinglist archives, you will find some hints.
http://www.freebsd.org/cgi/search.cgi?words=ip+alias+255.255.255.255&max=50&sort=date&index=recent&source=freebsd-questions

Or read the handbook:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-virtual-hosts.html

And it should be added to the FAQ ..

Hope that helps

Marc

PS: In short: If you have an IP alias in the same subnet the correct netmask is
255.255.255.255 as in example 3. It is forced since FreeBSD 4.5 AFAIK.


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