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Date:      Tue, 15 Feb 2005 20:45:04 +0300
From:      Igor Pokrovsky <ip@doom.homeunix.org>
To:        Chris Dillon <cdillon@wolves.k12.mo.us>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: How to make ipfw consider MAC-IP match?
Message-ID:  <20050215174504.GA1295@doom.homeunix.org>
In-Reply-To: <20050214161017.G42760@duey.wolves.k12.mo.us>
References:  <200502142022.j1EKMl5R092740@lurza.secnetix.de> <20050214145543.L42760@duey.wolves.k12.mo.us> <024501c512e0$aa382e30$0c00a8c0@artem> <20050214161017.G42760@duey.wolves.k12.mo.us>

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On Mon, Feb 14, 2005 at 04:18:47PM -0600, Chris Dillon wrote:
> >(i did not undestrand, how i somebody can match mac and ip with 
> >static arp except that he actually get the physical NIC from 
> >somebody's computer).
> 
> Because you can change the MAC address of your NIC to match someone 
> else's very easily.  Here's how in FreeBSD:
> 
> ifconfig fxp0 link 00:11:22:33:44:55
> 
> It's that easy...

It's not that easy. Not all cards support MAC address change.
And even if a card support this, it is not always possible to do this
with ifconfig.

-ip

-- 
On a beautiful day like this it's hard to believe anyone
can be unhappy -- but we will work on it.



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