From owner-freebsd-net@FreeBSD.ORG  Thu Jul 12 22:25:09 2012
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Date: Thu, 12 Jul 2012 15:25:07 -0700
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From: Chris Benesch <chris.benesch@gmail.com>
To: freebsd-net@freebsd.org
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Subject: Re: System doesn't detect unplugged network cable and doesn't set
 interface up properly with DHCP
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Maybe another option to dhclient to have it poll the interface every 2-3
seconds to see if it has lost a link and if so, set the lease timer to be
expired, and wait for it to come back and once it does, it will acquire a
new address.