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Date: Tue, 19 Jan 2010 18:05:00 -0500
From: Steve Bertrand <steve@ibctech.ca>
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To: Diego Montalvo <dmontalvo@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Automatic Network Settings at New Location
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Steve Bertrand wrote:
> Diego Montalvo wrote:
>> I am temporarily at a different location for the next day or so, and
>> need to connect to the internet via FreeBSD. My initial Network
>> settings where detected during setup using DCHP.  How do can I have
>> FreeBSD automatically detect the new network settings via DCHP?
> 
> # dhclient

Whoops! I think I misread that. How about setting:

ifconfig_em0="DHCP"

...in rc.conf, where em0 is your NIC?

Steve