From owner-freebsd-security  Tue Aug  7  7:33:56 2001
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Date: Tue, 07 Aug 2001 09:33:20 -0500
To: Fernando Schapachnik <fschapachnik@vianetworks.com.ar>,
	"Douglas G. Allen" <dallen@roe35.lth2.k12.il.us>
From: Christopher Schulte <christopher@schulte.org>
Subject: Re: ipfw question
Cc: freebsd-security@FreeBSD.ORG
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At 11:26 AM 8/7/2001 -0300, Fernando Schapachnik wrote:
>En un mensaje anterior, Douglas G. Allen escribi=F3:
>[...]
> > The ifconfig's are set up so that fxp0 is IP a.b.c.d netmask
> > 255.255.255.192 and fxp0_alias is a.b.c.e netmask 255.255.255.255.
>
>255.255.255.255 is an invalid netmask (I don't even know why ifconfig
>didn't rejected it). It should have the same netmask of the fxp0
>interface if what you mean is to have a machine with two IPs on the
>same network.

Not true;=20
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-virtu=
al-hosts.html

'The calculation of alias netmasks is important, but fortunately quite=20
simple. For a given interface, there must be one address which correctly=20
represents the network's netmask. Any other addresses which fall within=20
this network must have a netmask of all 1's.'

>Regards.
>
>
>Fernando P. Schapachnik
>Planificaci=F3n de red y tecnolog=EDa
>VIA NET.WORKS ARGENTINA S.A.
>fschapachnik@vianetworks.com.ar
>Tel.: (54-11) 4323-3381

-c


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