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Date:      Thu, 10 Oct 2002 02:19:56 +0200
From:      Paul te Bokkel <paul@tebokkel.com>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Bill Moran <wmoran@potentialtech.com>, Thomas Quinot <thomas@cuivre.fr.eu.org>, freebsd-stable@FreeBSD.ORG
Subject:   Re: Setup routing entry for host with a non-local IP address
Message-ID:  <20021010001956.GA58085@tebokkel.com>
In-Reply-To: <200210092201.g99M1YTA007964@apollo.backplane.com>
References:  <20021009151733.GA15162@melusine.cuivre.fr.eu.org> <20021009210242.GA34352@tebokkel.com> <3DA49D72.6070205@potentialtech.com> <200210092201.g99M1YTA007964@apollo.backplane.com>

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On Wed, Oct 09, 2002 at 03:01:34PM -0700, Matthew Dillon wrote:
>     Yes, you can put multiple subnets or multiple addresses on the same
>     subnet on the same physical interface.  I do it all the time:
> 
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 216.240.41.17 netmask 0xffffffc0 broadcast 216.240.41.63
>         inet 10.0.0.2 netmask 0xffffff00 broadcast 10.0.0.255
>         inet 216.240.41.21 netmask 0xffffffff broadcast 216.240.41.21

That's what I said..  However, I would never use the above setup if
it's supposed to be secure. Anyone with access to a machine in the
41.1-41.62 range would be able to sniff the 10-net, which would not
like. (maybe your setup allows for this, but I wouldn't mind the cost
of a $6 el-cheapo NIC and a crosscable to get more secure, it's even
cheaper than the time spend typing this mail ;-) ).

> 
>     There a couple of issues here.  First, you have to think of the
>     physical interface as being two physical interfaces even though
>     there is really just one.

But in the case of two physical interfaces on the same (physical)
segment, you get ARP errors. With aliases, you don't.


Regards,

Paul 

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